Pub Date : 2026-07-01Epub Date: 2026-02-03DOI: 10.1016/j.optcom.2026.132989
Jing Cui , Chao Wang , Yingchao Li , Qiang Fu , Xiangyu Li , Jianan Liu
The two-dimensional area imaging characteristics of the lenslet array IFS cause the incident light to possess a two-dimensional spatial distribution at the grating. This thereby leads to multi-order spectral overlap. Conventional spectral overlap suppression methods designed for slit-based imaging spectrometers with a single field of view are inadequate to address this issue directly, resulting in a significantly increased risk of spectral overlap and reduced accuracy of the acquired spectral data. To address this, this paper proposes a multi-order spectral overlap suppression method. Its core lies in establishing a constraint relationship among the maximum angle between the incident light and the grating normal, the spectral range, and the grating spacing. Based on this, strict conditions are derived to ensure that no spectral overlap occurs between zero-order and first-order, or between first-order and second-order spectra across all fields of view within the target wavelength band, thereby achieving effective suppression of spectral overlap during the initial design stage. Building upon these constraint conditions, a coordinated selection method for the grating spacing, the focal length of the collimation system, and the focal length of the imaging system is further proposed. To validate the effectiveness of the proposed method, a lenslet array IFS with a field of view of and an operational wavelength range of 550-800 nm was designed. The design results indicate that on the detector focal plane, a clear separation exists between the first-order diffracted spectrum of incident light 1 at long wavelengths and the second-order diffracted spectrum of incident light 2 at short wavelengths, while the zero-order spot is completely isolated from the first-order spectrum. This achieves full-band crosstalk-free operation and significantly improves the accuracy of spectral information.
{"title":"Research and design of multi-order spectral overlap suppression in a lenslet array integral field spectrometer (IFS)","authors":"Jing Cui , Chao Wang , Yingchao Li , Qiang Fu , Xiangyu Li , Jianan Liu","doi":"10.1016/j.optcom.2026.132989","DOIUrl":"10.1016/j.optcom.2026.132989","url":null,"abstract":"<div><div>The two-dimensional area imaging characteristics of the lenslet array IFS cause the incident light to possess a two-dimensional spatial distribution at the grating. This thereby leads to multi-order spectral overlap. Conventional spectral overlap suppression methods designed for slit-based imaging spectrometers with a single field of view are inadequate to address this issue directly, resulting in a significantly increased risk of spectral overlap and reduced accuracy of the acquired spectral data. To address this, this paper proposes a multi-order spectral overlap suppression method. Its core lies in establishing a constraint relationship among the maximum angle between the incident light and the grating normal, the spectral range, and the grating spacing. Based on this, strict conditions are derived to ensure that no spectral overlap occurs between zero-order and first-order, or between first-order and second-order spectra across all fields of view within the target wavelength band, thereby achieving effective suppression of spectral overlap during the initial design stage. Building upon these constraint conditions, a coordinated selection method for the grating spacing, the focal length of the collimation system, and the focal length of the imaging system is further proposed. To validate the effectiveness of the proposed method, a lenslet array IFS with a field of view of <span><math><mrow><mo>±</mo><msup><mn>4.76</mn><mo>∘</mo></msup></mrow></math></span> and an operational wavelength range of 550-800 nm was designed. The design results indicate that on the detector focal plane, a clear separation exists between the first-order diffracted spectrum of incident light 1 at long wavelengths and the second-order diffracted spectrum of incident light 2 at short wavelengths, while the zero-order spot is completely isolated from the first-order spectrum. This achieves full-band crosstalk-free operation and significantly improves the accuracy of spectral information.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 132989"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-01-31DOI: 10.1016/j.optcom.2026.132983
Wei Wei , Ruitao Wu , Zaiqun Wu , Juncheng Fang , Ying Li , Ting Lei , Xiaocong Yuan
The non-equalization property of mode-dependent loss (MDL) fundamentally limits the information capacities of mode-division multiplexing (MDM) systems, particularly for long-distance optical communications. We propose an inverse-designed approach for MDM systems with low MDL by integrating the mode-dependent equalizer into the multi-plane light conversion (MPLC) component for multi-mode wavefront matching. We experimentally demonstrate a six-mode free-space MDM link comprising a few-mode fiber and a standard multimode collimator, achieving a uniform loss spectrum with insertion loss lower than −6.62 dB, total mode crosstalk below −20 dB, and mode purity up to 80%. Additionally, each LP modes carrying 20 Gbit/s on-off keying signals are successfully transmitted over a 50-km FMF. We anticipate that this design strategy can be extended to other free-space optical communications systems without additional apparatus, potentially improving information capacity by orders of magnitude.
{"title":"Balanced amplification of six LP modes in 50 km few-mode fiber via multi-plane light conversion","authors":"Wei Wei , Ruitao Wu , Zaiqun Wu , Juncheng Fang , Ying Li , Ting Lei , Xiaocong Yuan","doi":"10.1016/j.optcom.2026.132983","DOIUrl":"10.1016/j.optcom.2026.132983","url":null,"abstract":"<div><div>The non-equalization property of mode-dependent loss (MDL) fundamentally limits the information capacities of mode-division multiplexing (MDM) systems, particularly for long-distance optical communications. We propose an inverse-designed approach for MDM systems with low MDL by integrating the mode-dependent equalizer into the multi-plane light conversion (MPLC) component for multi-mode wavefront matching. We experimentally demonstrate a six-mode free-space MDM link comprising a few-mode fiber and a standard multimode collimator, achieving a uniform loss spectrum with insertion loss lower than −6.62 dB, total mode crosstalk below −20 dB, and mode purity up to 80%. Additionally, each LP modes carrying 20 Gbit/s on-off keying signals are successfully transmitted over a 50-km FMF. We anticipate that this design strategy can be extended to other free-space optical communications systems without additional apparatus, potentially improving information capacity by orders of magnitude.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 132983"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-01-29DOI: 10.1016/j.optcom.2026.132959
Haiming Lu , Geyou Zhang , Rui Gao , Tong Zhou , Bo Zhang , Bin Xu , Kai Liu
One-shot structured light enables real-time 3D scanning, while typically suffering from poor accuracy. In fringe projection profilometry, phase sensitivity is maximized when the phase variation direction is orthogonal to the epipolar lines of the projector. Straight fringes are quasi-optimal under certain conditions. However, they are sensitive to system setup, and misalignment can cause noticeable accuracy loss. Circular fringe patterns overcome this limitation by achieving globally optimal phase sensitivity. In this paper, we present a generalized framework for one-shot FPP using optimal circular fringes. First, we develop a filter based on geometric analysis of the spectrum to extract the wrapped phase. Second, phase unwrapping and mapping are conducted to restore absolute phase. Finally we reconstruct 3D points via the extended epipolar geometry. Experiments show that circular fringes significantly improve reconstruction accuracy, especially in fine details, highlighting their superiority over straight fringes.
{"title":"One-shot optimal circular fringe projection profilometry","authors":"Haiming Lu , Geyou Zhang , Rui Gao , Tong Zhou , Bo Zhang , Bin Xu , Kai Liu","doi":"10.1016/j.optcom.2026.132959","DOIUrl":"10.1016/j.optcom.2026.132959","url":null,"abstract":"<div><div>One-shot structured light enables real-time 3D scanning, while typically suffering from poor accuracy. In fringe projection profilometry, phase sensitivity is maximized when the phase variation direction is orthogonal to the epipolar lines of the projector. Straight fringes are quasi-optimal under certain conditions. However, they are sensitive to system setup, and misalignment can cause noticeable accuracy loss. Circular fringe patterns overcome this limitation by achieving globally optimal phase sensitivity. In this paper, we present a generalized framework for one-shot FPP using optimal circular fringes. First, we develop a filter based on geometric analysis of the spectrum to extract the wrapped phase. Second, phase unwrapping and mapping are conducted to restore absolute phase. Finally we reconstruct 3D points via the extended epipolar geometry. Experiments show that circular fringes significantly improve reconstruction accuracy, especially in fine details, highlighting their superiority over straight fringes.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 132959"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146122639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-03DOI: 10.1016/j.optcom.2026.132984
Gyaprasad , Rajneesh Joshi
We theoretically investigate a novel mechanism for controlling the quantum degree of polarization of single- and multi-photon light fields through the combined effects of birefringence and dispersion in optical media. While birefringence alone introduces a unitary phase shift between horizontal (H) and vertical (V) polarization modes, the inclusion of dispersion produces frequency-dependent effects that couple polarization with spectral degrees of freedom, thereby inducing decoherence and transforming the quantum state into a mixed state. By employing an electro-optically controlled nematic liquid crystal as the birefringent medium, this decoherence process can be harnessed to achieve tunable control of the quantum degree of polarization. We model this voltage-dependent tunability theoretically and propose methods for experimental verification.
{"title":"Tunable decoherence of quantum polarization states via birefringence-frequency coupling using liquid crystal","authors":"Gyaprasad , Rajneesh Joshi","doi":"10.1016/j.optcom.2026.132984","DOIUrl":"10.1016/j.optcom.2026.132984","url":null,"abstract":"<div><div>We theoretically investigate a novel mechanism for controlling the quantum degree of polarization of single- and multi-photon light fields through the combined effects of birefringence and dispersion in optical media. While birefringence alone introduces a unitary phase shift between horizontal (H) and vertical (V) polarization modes, the inclusion of dispersion produces frequency-dependent effects that couple polarization with spectral degrees of freedom, thereby inducing decoherence and transforming the quantum state into a mixed state. By employing an electro-optically controlled nematic liquid crystal as the birefringent medium, this decoherence process can be harnessed to achieve tunable control of the quantum degree of polarization. We model this voltage-dependent tunability theoretically and propose methods for experimental verification.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 132984"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146122640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Compared to traditional sensors, metasurface sensors offer higher sensitivity and superior optical response. All-dielectric materials have broad prospects for refractive index sensing due to low ohmic loss. Here, we propose a double-rod all-dielectric nanostructure that exhibits a high-quality factor (high-Q) Fano resonance in the mid-infrared band. This resonance is highly sensitive to changes in the refractive index of the surrounding medium. Analysis of the electromagnetic field distribution and multipole moment decomposition, it is demonstrated that the resonance is driven by a toroidal dipole (TD) and a magnetic quadrupole (MQ). We systematically characterized the sensing performance of the proposed structure. The results show that it achieves a sensitivity of up to 1337.1 nm/RIU and a high figure of merit (FOM) of 1238. In the mid-infrared band, the structure exhibited a high Q factor of 18544. Moreover, its reflection spectrum in this band could be effectively tuned by adjusting the geometric parameters of the metasurface. Finally, investigations at different incident angles reveal that the resonant peak exhibits a distinct blueshift as the angle increases. Moreover, the structure shows a selective response to the polarization state, demonstrating excellent polarization sensitivity. This work shows that high-performance optical sensors can be fabricated using simple processes, thereby providing a fresh design framework and theoretical basis for the sensor community.
{"title":"High-Q mid-infrared refractive index sensor based on Fano resonance in an all-dielectric double-rod structure","authors":"Wenwen Wang, Fuming Yang, Wenwen Sun, Zhe Wu, Xiaoyan Shi, Junying Liu, Yuetao Liu, Jizheng Geng, Xintong Wei, Xiangtao Chen, Shijia Zhu, Zhongzhu Liang","doi":"10.1016/j.optcom.2026.132975","DOIUrl":"10.1016/j.optcom.2026.132975","url":null,"abstract":"<div><div>Compared to traditional sensors, metasurface sensors offer higher sensitivity and superior optical response. All-dielectric materials have broad prospects for refractive index sensing due to low ohmic loss. Here, we propose a double-rod all-dielectric nanostructure that exhibits a high-quality factor (high-Q) Fano resonance in the mid-infrared band. This resonance is highly sensitive to changes in the refractive index of the surrounding medium. Analysis of the electromagnetic field distribution and multipole moment decomposition, it is demonstrated that the resonance is driven by a toroidal dipole (TD) and a magnetic quadrupole (MQ). We systematically characterized the sensing performance of the proposed structure. The results show that it achieves a sensitivity of up to 1337.1 nm/RIU and a high figure of merit (FOM) of 1238. In the mid-infrared band, the structure exhibited a high Q factor of 18544. Moreover, its reflection spectrum in this band could be effectively tuned by adjusting the geometric parameters of the metasurface. Finally, investigations at different incident angles reveal that the resonant peak exhibits a distinct blueshift as the angle increases. Moreover, the structure shows a selective response to the polarization state, demonstrating excellent polarization sensitivity. This work shows that high-performance optical sensors can be fabricated using simple processes, thereby providing a fresh design framework and theoretical basis for the sensor community.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 132975"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146122642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-01-30DOI: 10.1016/j.ultras.2026.107983
Enze Chen, Paul Fromme
This study investigated the feasibility of guided ultrasonic wave monitoring of bone attachment to uncemented orthopaedic implants during the rehabilitation process (osseointegration), which is crucial for implant stability and long-term survival. Experiments were conducted using a simplified three-layer synthetic bone model of an intraosseous transcutaneous amputation prosthesis (ITAP) implant, used for femoral amputee patients, where epoxy curing simulated the bone ingrowth process associated with increasing bone-implant interface layer stiffness, representing the early stages of osseointegration. Longitudinal guided wave signals were excited and recorded at the distal end of the percutaneous part of the stainless-steel implant. Finite element analysis (FEA) was validated from the experiments and employed to investigate the sensitivity and wave mode selection. FEA simulations showed frequency shifts and group velocity changes of the guided wave modes with increased osseointegration, matching theoretical predictions. Evaluation of the reflected wave pulse in the time domain for both experimental monitoring and FEA simulations showed a significant increase in arrival time (10%) and amplitude drop (>50%). The results showed that the longitudinal guided waves are sensitive to stiffness changes during the bone healing process and provide insights for the development of in-vivo osseointegration monitoring during patient rehabilitation.
{"title":"Guided ultrasonic wave monitoring for osseointegration assessment of an intraosseous transcutaneous amputation prosthesis","authors":"Enze Chen, Paul Fromme","doi":"10.1016/j.ultras.2026.107983","DOIUrl":"10.1016/j.ultras.2026.107983","url":null,"abstract":"<div><div>This study investigated the feasibility of guided ultrasonic wave monitoring of bone attachment to uncemented orthopaedic implants during the rehabilitation process (osseointegration), which is crucial for implant stability and long-term survival. Experiments were conducted using a simplified three-layer synthetic bone model of an intraosseous transcutaneous amputation prosthesis (ITAP) implant, used for femoral amputee patients, where epoxy curing simulated the bone ingrowth process associated with increasing bone-implant interface layer stiffness, representing the early stages of osseointegration. Longitudinal guided wave signals were excited and recorded at the distal end of the percutaneous part of the stainless-steel implant. Finite element analysis (FEA) was validated from the experiments and employed to investigate the sensitivity and wave mode selection. FEA simulations showed frequency shifts and group velocity changes of the guided wave modes with increased osseointegration, matching theoretical predictions. Evaluation of the reflected wave pulse in the time domain for both experimental monitoring and FEA simulations showed a significant increase in arrival time (10%) and amplitude drop (>50%). The results showed that the longitudinal guided waves are sensitive to stiffness changes during the bone healing process and provide insights for the development of <em>in-vivo</em> osseointegration monitoring during patient rehabilitation.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"163 ","pages":"Article 107983"},"PeriodicalIF":4.1,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146133259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents an extension of the previous spectroscopic investigations for the linear molecules HC3N and HC4H. For both species, new high-resolution data have been recorded and analyzed. As far as HC3N is concerned, the investigation of the ro-vibrational features has been based on the Fourier transform far-infrared spectra from our previous studies and on the mid-infrared spectra targeting the prominent overtone band recently recorded at the synchrotron facility SOLEIL with a resolution of 0.003 and 0.002 cm−1. Moreover, several hundreds of pure rotational transitions belonging to excited vibrational states were recorded in Bologna. The resonance network wrapping around the level and involving the (), (), (), and excited states has been thoroughly analyzed. A global ro-vibrational fit was then achieved for all the vibrational levels up to 1300 cm−1, therefore improving our previous analysis. For diacetylene, the stretching band around 3333 cm−1 was recorded by high-resolution FTIR spectroscopy at the synchrotron facility SOLEIL at a resolution of 0.005 cm−1. The accidental resonance affecting this band has been successfully analyzed and the number of observed and assigned ro-vibrational transitions was considerably extended. The present investigation allowed the integration of the existing line lists in the HITRAN database for both molecules. In particular, no information about the band of diacetylene was present in HITRAN before this study.
{"title":"An improved study of cyanoacetylene and diacetylene including the strong 2ν5 band of HC3N and ν4 band of HC4H","authors":"Luca Bizzocchi , Mattia Melosso , Filippo Tamassia , Martina Taddia , Francesca Tonolo , Silvia Alessandrini , Gabriele Panizzi , Michela Nonne , Marie-Aline Martin-Drumel , Olivier Pirali , Luca Dore , Iouli E. Gordon , Cristina Puzzarini","doi":"10.1016/j.jqsrt.2026.109879","DOIUrl":"10.1016/j.jqsrt.2026.109879","url":null,"abstract":"<div><div>This paper presents an extension of the previous spectroscopic investigations for the linear molecules HC<sub>3</sub>N and HC<sub>4</sub>H. For both species, new high-resolution data have been recorded and analyzed. As far as HC<sub>3</sub>N is concerned, the investigation of the ro-vibrational features has been based on the Fourier transform far-infrared spectra from our previous studies and on the mid-infrared spectra targeting the prominent <span><math><mrow><mn>2</mn><msub><mrow><mi>ν</mi></mrow><mrow><mn>5</mn></mrow></msub></mrow></math></span> overtone band recently recorded at the synchrotron facility SOLEIL with a resolution of 0.003 and 0.002<!--> <!-->cm<sup>−1</sup>. Moreover, several hundreds of pure rotational transitions belonging to excited vibrational states were recorded in Bologna. The resonance network wrapping around the <span><math><mrow><msub><mrow><mi>v</mi></mrow><mrow><mn>5</mn></mrow></msub><mo>=</mo><mn>2</mn></mrow></math></span> level and involving the (<span><math><mrow><msub><mrow><mi>v</mi></mrow><mrow><mn>4</mn></mrow></msub><mo>=</mo><mn>1</mn><mo>,</mo><msub><mrow><mi>v</mi></mrow><mrow><mn>7</mn></mrow></msub><mo>=</mo><mn>2</mn></mrow></math></span>), (<span><math><mrow><msub><mrow><mi>v</mi></mrow><mrow><mn>6</mn></mrow></msub><mo>=</mo><mn>2</mn><mo>,</mo><msub><mrow><mi>v</mi></mrow><mrow><mn>7</mn></mrow></msub><mo>=</mo><mn>2</mn></mrow></math></span>), (<span><math><mrow><msub><mrow><mi>v</mi></mrow><mrow><mn>5</mn></mrow></msub><mo>=</mo><mn>1</mn><mo>,</mo><msub><mrow><mi>v</mi></mrow><mrow><mn>7</mn></mrow></msub><mo>=</mo><mn>3</mn></mrow></math></span>), and <span><math><mrow><msub><mrow><mi>v</mi></mrow><mrow><mn>7</mn></mrow></msub><mo>=</mo><mn>6</mn></mrow></math></span> excited states has been thoroughly analyzed. A global ro-vibrational fit was then achieved for all the vibrational levels up to 1300<!--> <!-->cm<sup>−1</sup>, therefore improving our previous analysis. For diacetylene, the <span><math><msub><mrow><mi>ν</mi></mrow><mrow><mn>4</mn></mrow></msub></math></span> stretching band around 3333<!--> <!-->cm<sup>−1</sup> was recorded by high-resolution FTIR spectroscopy at the synchrotron facility SOLEIL at a resolution of 0.005<!--> <!-->cm<sup>−1</sup>. The accidental resonance affecting this band has been successfully analyzed and the number of observed and assigned ro-vibrational transitions was considerably extended. The present investigation allowed the integration of the existing line lists in the HITRAN database for both molecules. In particular, no information about the <span><math><msub><mrow><mi>ν</mi></mrow><mrow><mn>4</mn></mrow></msub></math></span> band of diacetylene was present in HITRAN before this study.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"357 ","pages":"Article 109879"},"PeriodicalIF":1.9,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-01-25DOI: 10.1016/j.ultras.2026.107977
Hongjuan Yang , Jitong Ma , Zhengyan Yang , Tong Tian , Deshuang Deng , Dongyue Gao , Shuyi Ma , Lei Yang , Zhanjun Wu
Accurate determination of elastic constants is crucial for reliable ultrasonic defect detection in carbon fiber reinforced plastic (CFRP). However, non-destructive in-situ characterization of these constants, particularly via full-waveform inversion techniques, is hindered by the computational cost of wavefield simulations. Based on physics-informed neural networks (PINNs), a novel longitudinal and shear wavefield net (LSWNet) method is proposed for the forward wavefield prediction and inversion of ultrasonic waves in a unidirectional CFRP. The longitudinal and shear wave component fields at two moments, ultrasonic measurement data, and the 2D elastic wave equations of isotropic and anisotropic planes for unidirectional CFRP are embedded as physical constraint conditions to predict wavefields and elastic constants. For the inversion of elastic constants, ultrasonic data recorded by a linear phased array on the CFRP surface serve as input, while the LSWNet outputs C66, C13 and C44. To accelerate convergence in large-scale models, weights and biases learned from training on small-scale structures are transferred. The proposed method has been verified through both finite element simulation and experiments. The mean squared errors between the predicted wavefields by PINNs and those obtained from finite element simulation do not exceed 3.2 × 10-3, and the obtained elastic constants are close to the actual values. Furthermore, the elastic constants obtained via LSWNet are successfully applied to total focusing method, thereby enabling high-resolution detection of delamination damage. Consequently, the proposed method is capable of resolving forward and inverse issues associated with unidirectional CFRP ultrasonic wavefields, as well as in-situ characterization of elastic constants and damage imaging.
{"title":"LSWNet: A physics-informed neural network for ultrasonic wavefield prediction and elastic constant inversion in unidirectional CFRP","authors":"Hongjuan Yang , Jitong Ma , Zhengyan Yang , Tong Tian , Deshuang Deng , Dongyue Gao , Shuyi Ma , Lei Yang , Zhanjun Wu","doi":"10.1016/j.ultras.2026.107977","DOIUrl":"10.1016/j.ultras.2026.107977","url":null,"abstract":"<div><div>Accurate determination of elastic constants is crucial for reliable ultrasonic defect detection in carbon fiber reinforced plastic (CFRP). However, non-destructive in-situ characterization of these constants, particularly via full-waveform inversion techniques, is hindered by the computational cost of wavefield simulations. Based on physics-informed neural networks (PINNs), a novel longitudinal and shear wavefield net (LSWNet) method is proposed for the forward wavefield prediction and inversion of ultrasonic waves in a unidirectional CFRP. The longitudinal and shear wave component fields at two moments, ultrasonic measurement data, and the 2D elastic wave equations of isotropic and anisotropic planes for unidirectional CFRP are embedded as physical constraint conditions to predict wavefields and elastic constants. For the inversion of elastic constants, ultrasonic data recorded by a linear phased array on the CFRP surface serve as input, while the LSWNet outputs C<sub>66</sub>, C<sub>13</sub> and C<sub>44</sub>. To accelerate convergence in large-scale models, weights and biases learned from training on small-scale structures are transferred. The proposed method has been verified through both finite element simulation and experiments. The mean squared errors between the predicted wavefields by PINNs and those obtained from finite element simulation do not exceed 3.2 × 10<sup>-3</sup>, and the obtained elastic constants are close to the actual values. Furthermore, the elastic constants obtained via LSWNet are successfully applied to total focusing method, thereby enabling high-resolution detection of delamination damage. Consequently, the proposed method is capable of resolving forward and inverse issues associated with unidirectional CFRP ultrasonic wavefields, as well as in-situ characterization of elastic constants and damage imaging.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"163 ","pages":"Article 107977"},"PeriodicalIF":4.1,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146100617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-11DOI: 10.1016/j.ultras.2026.108003
Yu Zhang , Zenghua Liu , Xiaoran Wang , Yuheng Wu , Cunfu He
The service life of thermal barrier coatings (TBCs) in aircraft engines is limited by high-temperature degradation and mechanical wear, necessitating non-destructive assessment to monitor their condition. To address the complexity of guided wave dispersion in coated structures, a zero group velocity (ZGV) Lamb wave-based approach is introduced for thickness measurement. This study proposes a method for characterizing thermal barrier coating specimens using ZGV Lamb modes, based on an all-laser ultrasonic excitation and detection system. Finite element simulations were performed to extract ZGV-related parameters, which were fitted to the coating thickness using least squares and multivariate regression analysis. Simple and multiple regression models were developed and validated through laser ultrasonic experiments. The results demonstrate a robust, linear relationship between selected ZGV parameters and coating thickness, allowing accurate estimation of layer thickness. The average relative errors of TBC and substrate thickness estimation are less than 7.71% and 1.55%, respectively. The combination of Lamb wave mode analysis and model-based regression offers a viable and non-contact method for the quantitative evaluation of ceramic coating thickness.
{"title":"Non-contact characterization of thermal barrier coating plates using laser-based zero group velocity modes","authors":"Yu Zhang , Zenghua Liu , Xiaoran Wang , Yuheng Wu , Cunfu He","doi":"10.1016/j.ultras.2026.108003","DOIUrl":"10.1016/j.ultras.2026.108003","url":null,"abstract":"<div><div>The service life of thermal barrier coatings (TBCs) in aircraft engines is limited by high-temperature degradation and mechanical wear, necessitating non-destructive assessment to monitor their condition. To address the complexity of guided wave dispersion in coated structures, a zero group velocity (ZGV) Lamb wave-based approach is introduced for thickness measurement. This study proposes a method for characterizing thermal barrier coating specimens using ZGV Lamb modes, based on an all-laser ultrasonic excitation and detection system. Finite element simulations were performed to extract ZGV-related parameters, which were fitted to the coating thickness using least squares and multivariate regression analysis. Simple and multiple regression models were developed and validated through laser ultrasonic experiments. The results demonstrate a robust, linear relationship between selected ZGV parameters and coating thickness, allowing accurate estimation of layer thickness. The average relative errors of TBC and substrate thickness estimation are less than 7.71% and 1.55%, respectively. The combination of Lamb wave mode analysis and model-based regression offers a viable and non-contact method for the quantitative evaluation of ceramic coating thickness.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"163 ","pages":"Article 108003"},"PeriodicalIF":4.1,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146174318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-07-01Epub Date: 2026-02-04DOI: 10.1016/j.optcom.2026.132990
Muhammad Idrees , Yuanping Chen , Beibing Huang , Hui-Jun Li , Zareen A. Khan , Yuee Xie
We theoretically investigate ultrahigh-resolution two-dimensional (2D) atomic localization in a hybrid nanosystem composed of metallic nanoparticles (MNPs) embedded in a coherent three-level -type atomic medium serving as a dielectric host. Structured laser fields excite tunable surface plasmon polaritons (SPPs) at the MNP-dielectric interface, with resonances analytically derived from Maxwell’s equations under suitable boundary conditions. The atomic dynamics are described via the density matrix formalism, where the control-field Rabi frequency is modeled as a superposition of two orthogonal standing waves along the - and -directions, characterized by azimuthal quantum numbers and spatial phase shifts. The spatially dependent light-matter interaction, together with phase modulation, generates sharply localized probability peaks within a single-wavelength domain, marking high-probability atomic positions. By tuning azimuthal quantum numbers, and the phase parameters, the spatial symmetry is enhanced while the number of localized peaks is reduced, ultimately yielding a single dominant localization site with higher probability. This approach achieves ultrahigh-resolution localization in regions smaller than , representing a significant improvement over previous schemes. The resulting tunable probability distributions provide a versatile platform for precision atomic localization in quantum nanoplasmonics, with potential applications in nanophotonics, nanomedicine, and quantum information processing.
{"title":"Plasmon-enhanced two-dimensional atomic localization with controllable azimuthal symmetry","authors":"Muhammad Idrees , Yuanping Chen , Beibing Huang , Hui-Jun Li , Zareen A. Khan , Yuee Xie","doi":"10.1016/j.optcom.2026.132990","DOIUrl":"10.1016/j.optcom.2026.132990","url":null,"abstract":"<div><div>We theoretically investigate ultrahigh-resolution two-dimensional (2D) atomic localization in a hybrid nanosystem composed of metallic nanoparticles (MNPs) embedded in a coherent three-level <span><math><mi>λ</mi></math></span>-type atomic medium serving as a dielectric host. Structured laser fields excite tunable surface plasmon polaritons (SPPs) at the MNP-dielectric interface, with resonances analytically derived from Maxwell’s equations under suitable boundary conditions. The atomic dynamics are described via the density matrix formalism, where the control-field Rabi frequency is modeled as a superposition of two orthogonal standing waves along the <span><math><mi>x</mi></math></span>- and <span><math><mi>y</mi></math></span>-directions, characterized by azimuthal quantum numbers and spatial phase shifts. The spatially dependent light-matter interaction, together with phase modulation, generates sharply localized probability peaks within a single-wavelength domain, marking high-probability atomic positions. By tuning azimuthal quantum numbers, and the phase parameters, the spatial symmetry is enhanced while the number of localized peaks is reduced, ultimately yielding a single dominant localization site with higher probability. This approach achieves ultrahigh-resolution localization in regions smaller than <span><math><mrow><mi>λ</mi><mo>/</mo><mn>30</mn><mo>×</mo><mi>λ</mi><mo>/</mo><mn>30</mn></mrow></math></span>, representing a significant improvement over previous schemes. The resulting tunable probability distributions provide a versatile platform for precision atomic localization in quantum nanoplasmonics, with potential applications in nanophotonics, nanomedicine, and quantum information processing.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"608 ","pages":"Article 132990"},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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