Optics Communications最新文献

英文中文

Scattering wavefront shaping guided by mask based on third-order correlation of light fields

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-03-07 DOI: 10.1016/j.optcom.2025.131716

Ying Zhao , Xiaodan Fan , Meigang Duan , Yao Ju , Xin Deng , Zuogang Yang , Haolan Huangfu , Xiaozhan Yang , Jie Hu , Haoyi Zuo

This paper reports a method of manipulating scattered light fields based on third-order correlation of light fields (TCLF) guided by a mask. Different from the traditional computational reconstruction of object images through the second-order correlation of light intensity in ghost imaging, the TCLF can optically reconstruct mask images in scattered fields. This optical reconstruction process enables a portion of the energy in the scattered field to be redistributed to match the object, thus enabling this imaging technique to serve as scattering wavefront shaping (SWFS) guided by a mask. Experiments show that the TCLF can easily achieve SWFS with high-resolution modulation, which has always been a challenge in this research field. With high-resolution modulation, the TCLF can shape the scattered field into more complex images, including grayscale images, and even enable video transmission through the scattering medium. This research provides a new and powerful method for SWFS, thus offering technical support for scattering-assisted holography and finding potential applications in complex media imaging in the future.

{"title":"Scattering wavefront shaping guided by mask based on third-order correlation of light fields","authors":"Ying Zhao , Xiaodan Fan , Meigang Duan , Yao Ju , Xin Deng , Zuogang Yang , Haolan Huangfu , Xiaozhan Yang , Jie Hu , Haoyi Zuo","doi":"10.1016/j.optcom.2025.131716","DOIUrl":"10.1016/j.optcom.2025.131716","url":null,"abstract":"<div><div>This paper reports a method of manipulating scattered light fields based on third-order correlation of light fields (TCLF) guided by a mask. Different from the traditional computational reconstruction of object images through the second-order correlation of light intensity in ghost imaging, the TCLF can optically reconstruct mask images in scattered fields. This optical reconstruction process enables a portion of the energy in the scattered field to be redistributed to match the object, thus enabling this imaging technique to serve as scattering wavefront shaping (SWFS) guided by a mask. Experiments show that the TCLF can easily achieve SWFS with high-resolution modulation, which has always been a challenge in this research field. With high-resolution modulation, the TCLF can shape the scattered field into more complex images, including grayscale images, and even enable video transmission through the scattering medium. This research provides a new and powerful method for SWFS, thus offering technical support for scattering-assisted holography and finding potential applications in complex media imaging in the future.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131716"},"PeriodicalIF":2.2,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619281","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}

引用次数: 0

Design and control of rotating varifocal elliptical airy vortex beams using composite phase metasurfaces

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-03-07 DOI: 10.1016/j.optcom.2025.131727

Bo Hu , Si-jing Huang , Qian Qin , Jiong-jiong Cai , Ming-li Sun , Xiao-gang Wang , Kaikai- Huang , Yue-ying Qi , Bi-jun Xu

In this paper, we propose a novel method for generating tunable elliptical Airy beams (EAVBs) using a bilayer all-dielectric metasurface. The metasurface is designed through the integration and rotation of the phase profiles of elliptical Airy beams and two off-axis Fresnel lenses.The dynamic tuning of the focal length and the beam propagation characteristics is accomplished by taking advantage of the moiré effect, which is generated from the interference between the superimposed phase distributions. The metasurface was theoretically modeled using MATLAB and then verified through Finite-Difference Time-Domain (FDTD) simulations. The results show that it can flexibly control the focal points in the x-y and x-z planes, thereby enabling precise control over the trajectory and focal position of the beam. The high degree of agreement between the theoretical predictions and the simulation results verifies that the proposed metasurface design is effective and versatile. This innovative approach has great application potential in adaptive optics, high-resolution imaging, and optical systems for dynamic beam shaping and focus control.

{"title":"Design and control of rotating varifocal elliptical airy vortex beams using composite phase metasurfaces","authors":"Bo Hu , Si-jing Huang , Qian Qin , Jiong-jiong Cai , Ming-li Sun , Xiao-gang Wang , Kaikai- Huang , Yue-ying Qi , Bi-jun Xu","doi":"10.1016/j.optcom.2025.131727","DOIUrl":"10.1016/j.optcom.2025.131727","url":null,"abstract":"<div><div>In this paper, we propose a novel method for generating tunable elliptical Airy beams (EAVBs) using a bilayer all-dielectric metasurface. The metasurface is designed through the integration and rotation of the phase profiles of elliptical Airy beams and two off-axis Fresnel lenses.The dynamic tuning of the focal length and the beam propagation characteristics is accomplished by taking advantage of the moiré effect, which is generated from the interference between the superimposed phase distributions. The metasurface was theoretically modeled using MATLAB and then verified through Finite-Difference Time-Domain (FDTD) simulations. The results show that it can flexibly control the focal points in the x-y and x-z planes, thereby enabling precise control over the trajectory and focal position of the beam. The high degree of agreement between the theoretical predictions and the simulation results verifies that the proposed metasurface design is effective and versatile. This innovative approach has great application potential in adaptive optics, high-resolution imaging, and optical systems for dynamic beam shaping and focus control.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131727"},"PeriodicalIF":2.2,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644535","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}

引用次数: 0

Real-time dynamically controllable polarization holographic grating 实时动态可控偏振全息光栅

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-03-06 DOI: 10.1016/j.optcom.2025.131717

Hong Chen , Ziyao Lyu , Changshun Wang

A novel real-time dynamic controllable polarization holographic grating (PHG) has been developed using an azobenzene liquid crystal film, achieved through a periodic recording-erasing process. During recording, two orthogonally polarized lights are utilized, while circularly polarized light (CPL) is used for erasing the grating. The effects of pump intensity and temperature on the PHG are investigated through a series of experiments and numerical simulations. Finally, a peak diffraction efficiency of 17.6% is observed at 80 °C and 30 mW/cm². The photoinduced birefringence of the PHG recorded with orthogonal circular polarizations is higher than that recorded with orthogonal linear polarizations. These findings enable customized information storage within the PHG, significantly enhancing its potential applications in optical control and storage.

引用次数: 0

Enhanced robustness of high Q-factor chiral metasurface via Brillouin zone folding

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-03-06 DOI: 10.1016/j.optcom.2025.131693

Shuang Yang , Xin Zhang , Jia Liu , Hengli Feng , Hongyan Meng , Yang Jia , Yachen Gao

Chiral structures have broad applications in fields such as biosensing, chemistry, and nonlinear optics. However, in the design of chiral structures, it is also challenging to achieve a high circular dichroism (CD), high Q-factor and high robustness. In our study, we designed a metasurface based on α-Si, by inducting Brillouin zone folding we enhanced the Q-factor of BICs over a broad wavevector range. Specifically, by doubling the period of the unit structure of the metasurface, we enhanced the Q factors over a wide range via Brillouin zone folding. Furthermore, by breaking in-plane and out-of-plane symmetries of the structure, dual narrowband chiral functionalities were achieved. At the two resonance frequencies of 17.4808 THz and 17.4811 THz, CD values reached −0.94 and −0.93, with Q-factors as high as 3.7 × 10⁵, exhibiting strong robustness in both momentum and geometric spaces. Finaly, we investigated the physical mechanisms of CD and high-Q factors through band structure analysis and multipole decomposition. This work provides new insights into the design of chiral optical devices and offers potential benefits for improving the performance of biosensing and nonlinear optical devices.

{"title":"Enhanced robustness of high Q-factor chiral metasurface via Brillouin zone folding","authors":"Shuang Yang , Xin Zhang , Jia Liu , Hengli Feng , Hongyan Meng , Yang Jia , Yachen Gao","doi":"10.1016/j.optcom.2025.131693","DOIUrl":"10.1016/j.optcom.2025.131693","url":null,"abstract":"<div><div>Chiral structures have broad applications in fields such as biosensing, chemistry, and nonlinear optics. However, in the design of chiral structures, it is also challenging to achieve a high circular dichroism (CD), high Q-factor and high robustness. In our study, we designed a metasurface based on α-Si, by inducting Brillouin zone folding we enhanced the Q-factor of BICs over a broad wavevector range. Specifically, by doubling the period of the unit structure of the metasurface, we enhanced the Q factors over a wide range via Brillouin zone folding. Furthermore, by breaking in-plane and out-of-plane symmetries of the structure, dual narrowband chiral functionalities were achieved. At the two resonance frequencies of 17.4808 THz and 17.4811 THz, CD values reached −0.94 and −0.93, with Q-factors as high as 3.7 × 10<sup>5</sup>, exhibiting strong robustness in both momentum and geometric spaces. Finaly, we investigated the physical mechanisms of CD and high-Q factors through band structure analysis and multipole decomposition. This work provides new insights into the design of chiral optical devices and offers potential benefits for improving the performance of biosensing and nonlinear optical devices.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131693"},"PeriodicalIF":2.2,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601528","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}

引用次数: 0

Enhancing the performance of NOMA-based VLC systems using a proposed adaptive superimposed constellation Algorithm with an exact SER analysis

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-03-06 DOI: 10.1016/j.optcom.2025.131701

Androw Sobhy , Shaimaa ElSayed , Hala Abd El-kader Mansour , Maher Abdelrasoul , Esraa M. Eid

Non-orthogonal multiple access (NOMA) is an impressive multi-access technology that enhances the spectral efficiency of visible light communication (VLC) systems. However, improved spectral efficiency might lead to performance reduction. To resolve this issue, this paper proposes an innovative approach termed the adaptive superimposed constellation algorithm (ASCA), which is intended for NOMA-based VLC systems. The proposed algorithm includes two fundamental methods: the optimal power allocation factor (OPAF) and adaptive M-QAM selection (AMS). The OPAF method determines the appropriate PA, ensuring non-overlapping decision regions for superimposed constellation symbols across different modulation orders supported by corresponding theoretical results. The AMS method dynamically selects the M-QAM modulation order for users, striking a balance between communication quality and data transmission rates. These methods collectively improve fairness among users, reduce the symbol error rate (SER), analyze limitations regarding the total number of users the system can serve, and evaluate the system's capacity to support multiple users effectively. This paper offers closed-form SER expressions for served users based on square QAM modulation and an imperfect successive interference cancellation (SIC) scenario. Theoretical analysis and simulations confirm the findings. The simulation results show that the proposed algorithm achieves better SER performance than other power domain (PD) NOMA schemes, making it a reliable and efficient solution for integrating NOMA into VLC systems.

{"title":"Enhancing the performance of NOMA-based VLC systems using a proposed adaptive superimposed constellation Algorithm with an exact SER analysis","authors":"Androw Sobhy , Shaimaa ElSayed , Hala Abd El-kader Mansour , Maher Abdelrasoul , Esraa M. Eid","doi":"10.1016/j.optcom.2025.131701","DOIUrl":"10.1016/j.optcom.2025.131701","url":null,"abstract":"<div><div>Non-orthogonal multiple access (NOMA) is an impressive multi-access technology that enhances the spectral efficiency of visible light communication (VLC) systems. However, improved spectral efficiency might lead to performance reduction. To resolve this issue, this paper proposes an innovative approach termed the adaptive superimposed constellation algorithm (ASCA), which is intended for NOMA-based VLC systems. The proposed algorithm includes two fundamental methods: the optimal power allocation factor (OPAF) and adaptive M-QAM selection (AMS). The OPAF method determines the appropriate PA, ensuring non-overlapping decision regions for superimposed constellation symbols across different modulation orders supported by corresponding theoretical results. The AMS method dynamically selects the M-QAM modulation order for users, striking a balance between communication quality and data transmission rates. These methods collectively improve fairness among users, reduce the symbol error rate (SER), analyze limitations regarding the total number of users the system can serve, and evaluate the system's capacity to support multiple users effectively. This paper offers closed-form SER expressions for served users based on square QAM modulation and an imperfect successive interference cancellation (SIC) scenario. Theoretical analysis and simulations confirm the findings. The simulation results show that the proposed algorithm achieves better SER performance than other power domain (PD) NOMA schemes, making it a reliable and efficient solution for integrating NOMA into VLC systems.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131701"},"PeriodicalIF":2.2,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610926","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}

引用次数: 0

Highly localized linear array of optical rings with multiple tunable degrees of freedom

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-03-06 DOI: 10.1016/j.optcom.2025.131714

Yongxi Zeng , Yanzhong Yu , Musheng Chen , Pinghui Wu , Shiyang Zheng , Zhonglong Wu , Shunda Lin , Guangping Yao , Qiwen Zhan

By combining time-reversal techniques and antenna radiation theory, we present a simplified approach to generate a novel highly localized linear array of optical rings with multiple tunable degrees of freedom, without complex optimization of the pupil field. Utilizing the radiation field of a magnetic current line source (MLS) with a periodic cosine-squared tapered distribution, we inversely obtain the pupil field required to generate the desired focal field. The characteristics of the focal field, after focusing by a 4π focusing system, are evaluated through vector Debye diffraction integral theory. The results reveal that the focal field forms a linear array of identical optical rings aligned along the direction of the MLS. Each ring exhibits a purely azimuthal polarization with only azimuthal optical field components. The number of rings is determined by the periodic parameters of the magnetic current, while the position and spacing of the rings depend on both the length and periodic parameters of the MLS. The highly localized, tunable linear array of optical rings holds significant potential for applications in optical parallel processing, multi-point particle trapping, and transportation.

{"title":"Highly localized linear array of optical rings with multiple tunable degrees of freedom","authors":"Yongxi Zeng , Yanzhong Yu , Musheng Chen , Pinghui Wu , Shiyang Zheng , Zhonglong Wu , Shunda Lin , Guangping Yao , Qiwen Zhan","doi":"10.1016/j.optcom.2025.131714","DOIUrl":"10.1016/j.optcom.2025.131714","url":null,"abstract":"<div><div>By combining time-reversal techniques and antenna radiation theory, we present a simplified approach to generate a novel highly localized linear array of optical rings with multiple tunable degrees of freedom, without complex optimization of the pupil field. Utilizing the radiation field of a magnetic current line source (MLS) with a periodic cosine-squared tapered distribution, we inversely obtain the pupil field required to generate the desired focal field. The characteristics of the focal field, after focusing by a 4π focusing system, are evaluated through vector Debye diffraction integral theory. The results reveal that the focal field forms a linear array of identical optical rings aligned along the direction of the MLS. Each ring exhibits a purely azimuthal polarization with only azimuthal optical field components. The number of rings is determined by the periodic parameters of the magnetic current, while the position and spacing of the rings depend on both the length and periodic parameters of the MLS. The highly localized, tunable linear array of optical rings holds significant potential for applications in optical parallel processing, multi-point particle trapping, and transportation.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131714"},"PeriodicalIF":2.2,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580717","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}

引用次数: 0

Remote Sr optical clock comparison with 10−17 fractional instability through a 54 km urban fiber link

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-03-05 DOI: 10.1016/j.optcom.2025.131712

Fei Meng , Yige Lin , Zhanjun Fang , Zhigang Zhang

We present a frequency instability comparison between two Strontium optical lattice clocks situated at the two campuses of National Institute of Metrology of China (NIM) over 54-km-long optical fiber link. Two clock lasers are locked to the clock transitions of strontium atoms without corrections for the optical lattice clocks’ systematic frequency shifts and relativistic red shift, etc. We utilize the 1542 nm (ITU grid, Channel 44) ECDL laser for the transmission of optical frequencies and assess the fractional instability of the transmitted out-of-loop signal using a 108 km loop-back fiber. The fractional instability of the fiber link attains 1.2 × 10⁻¹⁶ at 1 s, which closely matches the theoretical limit calculated from the Power Spectral Density (PSD) of the fiber link noise. A modified transfer oscillator (TO) was employed to perform the frequency comparison between remote clock laser (698 nm) and transfer laser (1542 nm). Ultimately, the inter-site comparison of the two clocks achieved a fractional instability better than 5.6 × 10⁻¹⁶ at 1 s and 3.5 × 10⁻¹⁷ at 10,000 s.

{"title":"Remote Sr optical clock comparison with 10−17 fractional instability through a 54 km urban fiber link","authors":"Fei Meng , Yige Lin , Zhanjun Fang , Zhigang Zhang","doi":"10.1016/j.optcom.2025.131712","DOIUrl":"10.1016/j.optcom.2025.131712","url":null,"abstract":"<div><div>We present a frequency instability comparison between two Strontium optical lattice clocks situated at the two campuses of National Institute of Metrology of China (NIM) over 54-km-long optical fiber link. Two clock lasers are locked to the clock transitions of strontium atoms without corrections for the optical lattice clocks’ systematic frequency shifts and relativistic red shift, etc. We utilize the 1542 nm (ITU grid, Channel 44) ECDL laser for the transmission of optical frequencies and assess the fractional instability of the transmitted out-of-loop signal using a 108 km loop-back fiber. The fractional instability of the fiber link attains 1.2 × 10<sup>−16</sup> at 1 s, which closely matches the theoretical limit calculated from the Power Spectral Density (PSD) of the fiber link noise. A modified transfer oscillator (TO) was employed to perform the frequency comparison between remote clock laser (698 nm) and transfer laser (1542 nm). Ultimately, the inter-site comparison of the two clocks achieved a fractional instability better than 5.6 × 10<sup>−16</sup> at 1 s and 3.5 × 10<sup>−17</sup> at 10,000 s.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131712"},"PeriodicalIF":2.2,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644035","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}

引用次数: 0

SAFT imaging for detection of micro surface defects improved by vector coherence factor using line source laser induced Rayleigh waves

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-03-05 DOI: 10.1016/j.optcom.2025.131710

Shutong Dai , Xiaokai Wang , Kangwen Huang , Yu Peng , Wenlong Yan , Zhixiong Han , Linlin Gui

Defects such as microcracks and micro holes on material surfaces have significant impact on the operational safety of components. Therefore, the imaging detection, quantification, and localization of surface defects are of critical importance. Laser ultrasonics has been widely applied in defect detection, however, efficient detection of micro surface defects remains a difficulty due to the influence of noise. This study proposed a method that combined the synthetic aperture focusing technique (SAFT) with the laser ultrasonic testing (LUT) for the non-destructive testing (NDT) imaging of micro surface hole defects. The low attenuation characteristic of Rayleigh waves generated by a line source laser expands the detection range for surface defect imaging and improves detection efficiency. Three-dimensional multi-physics simulations of Rayleigh waves produced by both line source and point source lasers were developed to illustrate the propagation characteristics of Rayleigh waves associated with light source configurations. In addition, the interactions between Rayleigh waves generated by various widths of line source lasers and micro hole defects on the surface were simulated and analyzed. Raster scans and SAFT imaging were conducted on surface hole defects with Φ0.1 mm using point source and line source lasers, respectively, for verification of propose method in imaging range. The vector coherence factor (VCF) was applied to improve the SAFT imaging quality, and the factors influencing imaging quality were discussed through experiments. Finally, inspections of surface hole defects with varying diameters were conducted to validate the effectiveness of the proposed method for quantitative defect detection.

{"title":"SAFT imaging for detection of micro surface defects improved by vector coherence factor using line source laser induced Rayleigh waves","authors":"Shutong Dai , Xiaokai Wang , Kangwen Huang , Yu Peng , Wenlong Yan , Zhixiong Han , Linlin Gui","doi":"10.1016/j.optcom.2025.131710","DOIUrl":"10.1016/j.optcom.2025.131710","url":null,"abstract":"<div><div>Defects such as microcracks and micro holes on material surfaces have significant impact on the operational safety of components. Therefore, the imaging detection, quantification, and localization of surface defects are of critical importance. Laser ultrasonics has been widely applied in defect detection, however, efficient detection of micro surface defects remains a difficulty due to the influence of noise. This study proposed a method that combined the synthetic aperture focusing technique (SAFT) with the laser ultrasonic testing (LUT) for the non-destructive testing (NDT) imaging of micro surface hole defects. The low attenuation characteristic of Rayleigh waves generated by a line source laser expands the detection range for surface defect imaging and improves detection efficiency. Three-dimensional multi-physics simulations of Rayleigh waves produced by both line source and point source lasers were developed to illustrate the propagation characteristics of Rayleigh waves associated with light source configurations. In addition, the interactions between Rayleigh waves generated by various widths of line source lasers and micro hole defects on the surface were simulated and analyzed. Raster scans and SAFT imaging were conducted on surface hole defects with Φ0.1 mm using point source and line source lasers, respectively, for verification of propose method in imaging range. The vector coherence factor (VCF) was applied to improve the SAFT imaging quality, and the factors influencing imaging quality were discussed through experiments. Finally, inspections of surface hole defects with varying diameters were conducted to validate the effectiveness of the proposed method for quantitative defect detection.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131710"},"PeriodicalIF":2.2,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637317","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}

引用次数: 0

Large circular dichroic long-wave infrared polarization photodetector based on rotationally operated chiral metasurfaces

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-03-05 DOI: 10.1016/j.optcom.2025.131680

Bo Cheng , Li Liu , Yuxiao Zou , Guofeng Song , Shujie Li , Kunpeng Zhai

A long-wave HgCdTe (MCT) detector, akin to the human eye, cannot inherently discern light polarization. Therefore, a miniature polarization filter needs to be placed in front of the image sensor, which defines the intensity of the different polarization modes. However, the circular dichroism and circular polarization extinction ratios of these miniature polarization detectors are typically not very high in the mid and long wavelength bands, which severely limits the polarization resolving power of the pixels. We numerically simulate a circularly dichroic metasurface based on the silicon material, gradually break the spatial symmetry through displacement and rotation operations of the unit cell of metasurface, and analyze the cause of the large chiral symmetry based on the FP mode and near-field map of the electric field intensity. The resulting high-quality chiral metasurface-based photodetector achieves remarkable circular dichroism and circularly polarized extinction ratios of 0.97 and 20 dB, respectively, promising advancements in microdetector technology from intensity to polarization detection. Last but not least, the use of silicon materials aligns with established silicon-based processes, reducing theoretical process preparation challenges.

{"title":"Large circular dichroic long-wave infrared polarization photodetector based on rotationally operated chiral metasurfaces","authors":"Bo Cheng , Li Liu , Yuxiao Zou , Guofeng Song , Shujie Li , Kunpeng Zhai","doi":"10.1016/j.optcom.2025.131680","DOIUrl":"10.1016/j.optcom.2025.131680","url":null,"abstract":"<div><div>A long-wave HgCdTe (MCT) detector, akin to the human eye, cannot inherently discern light polarization. Therefore, a miniature polarization filter needs to be placed in front of the image sensor, which defines the intensity of the different polarization modes. However, the circular dichroism and circular polarization extinction ratios of these miniature polarization detectors are typically not very high in the mid and long wavelength bands, which severely limits the polarization resolving power of the pixels. We numerically simulate a circularly dichroic metasurface based on the silicon material, gradually break the spatial symmetry through displacement and rotation operations of the unit cell of metasurface, and analyze the cause of the large chiral symmetry based on the FP mode and near-field map of the electric field intensity. The resulting high-quality chiral metasurface-based photodetector achieves remarkable circular dichroism and circularly polarized extinction ratios of 0.97 and 20 dB, respectively, promising advancements in microdetector technology from intensity to polarization detection. Last but not least, the use of silicon materials aligns with established silicon-based processes, reducing theoretical process preparation challenges.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131680"},"PeriodicalIF":2.2,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610927","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}

引用次数: 0

High-sensitivity and multiple fingerprint detection at an exception point in electromagnetic induced transparent metasurfaces

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-03-05 DOI: 10.1016/j.optcom.2025.131699

Pingsheng Zhang, Menghan Xiong, Xingyan Zhao, Yang Qiu, Shaonan Zheng, Yuan Dong, Qize Zhong, Ting Hu

Electromagnetic induced transparent (EIT) metasurfaces have garnered significant interest in the terahertz (THz) fingerprint sensing field, owing to their capability to enhance light-matter interactions. However, previous EIT metasurfaces typically exhibit unsatisfactory sensitivity and a narrower detection bandwidth, limiting their capability in broadband fingerprint detection. Here, an EIT metasurface characterized by exceptional point and tunable properties is presented. Based on the synchronous gate voltage tuning, this EIT metasurface demonstrates tunability in the range of 2.6–4.1 THz, which facilitates the acquisition of multiple fingerprint from analytes. And through theoretical calculations, the exceptional point was accurately identified, enabling the EIT metasurface to achieve a sensitivity of 1.22 THz/RIU. Most importantly, the proposed EIT metasurface identifies multiple THz fingerprints of melamine, showcasing a excellent capability for fingerprint sensing. The proposed EIT metasurface integrates high sensitivity and tunability, showcasing significant potential for applications in broadband THz fingerprint sensing.

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