Pub Date : 2026-01-16DOI: 10.1016/j.optcom.2026.132923
Anita Kumari, Vishwa Pal
We present a combined experimental and numerical study on the abrupt autofocusing and scintillation dynamics of truncated circular Airy derivative beams (CADBs) in free space and in strong turbulence. Inner and outer truncations of up to 60% are applied to investigate the impact of structural modifications on beam propagation. The autofocusing strength, quantified by the maximum K-value, is found to decrease systematically with increasing truncation. Inner truncation maintains higher maximum K-value but demonstrated increased sensitivity to turbulence. In contrast, outer truncation yields lower maximum K-value while offering enhanced robustness under turbulent conditions. Despite strong turbulence, all truncated CADBs exhibit a notable rise in their K-value, confirming the resilience of their intrinsic self-accelerating autofocusing behaviour. Further, scintillation index analysis reveal that self-healing governs turbulence response: inner truncation delays but intensifies scintillation due to core reconstruction, whereas outer truncation allows faster stabilization with reduced fluctuations. These results highlight truncation as a tunable parameter for balancing focusing strength and turbulence robustness, with relevance to free-space optical communication, imaging, and optical trapping.
{"title":"Abrupt autofocusing and scintillation dynamics of truncated circular airy derivative beams in strong turbulence","authors":"Anita Kumari, Vishwa Pal","doi":"10.1016/j.optcom.2026.132923","DOIUrl":"10.1016/j.optcom.2026.132923","url":null,"abstract":"<div><div>We present a combined experimental and numerical study on the abrupt autofocusing and scintillation dynamics of truncated circular Airy derivative beams (CADBs) in free space and in strong turbulence. Inner and outer truncations of up to 60% are applied to investigate the impact of structural modifications on beam propagation. The autofocusing strength, quantified by the maximum K-value, is found to decrease systematically with increasing truncation. Inner truncation maintains higher maximum K-value but demonstrated increased sensitivity to turbulence. In contrast, outer truncation yields lower maximum K-value while offering enhanced robustness under turbulent conditions. Despite strong turbulence, all truncated CADBs exhibit a notable rise in their K-value, confirming the resilience of their intrinsic self-accelerating autofocusing behaviour. Further, scintillation index analysis reveal that self-healing governs turbulence response: inner truncation delays but intensifies scintillation due to core reconstruction, whereas outer truncation allows faster stabilization with reduced fluctuations. These results highlight truncation as a tunable parameter for balancing focusing strength and turbulence robustness, with relevance to free-space optical communication, imaging, and optical trapping.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"607 ","pages":"Article 132923"},"PeriodicalIF":2.5,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025932","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 : 2026-01-16DOI: 10.1016/j.optcom.2026.132920
Jeonghun Seong , Jaehyeon Lim , Gibeen Gu , Taewon Kim , Hyeokin Kang , Sunghun Lee , Wooseok Park , Hyosang Yoon , Young-Jin Kim
Atmospheric effects degrade the performance of free-space optical links, which has prompted extensive research over several decades. Most studies have focused on scintillation, which describes the fluctuation in received optical power at the receiver. Meanwhile, the beam wander (BW) and angle-of-arrival (AoA) fluctuations are two factors that directly impact the position and angular movement of the optical beam in free-space. These effects are especially crucial for single-mode fiber-coupled free-space optical (FSO) communication systems to achieve high bandwidth and large-capacity data transmission via well-established fiber-optic communication components. However, despite their significance, detailed studies on BW and AoA fluctuations have not been addressed. In this study, we present a real-time monitoring system capable of simultaneously measuring the BW and AoA fluctuations with high precision using a single commercial camera; the system achieves a positional resolution within 80 μm (RMSE: 30.2 μm) and an angular resolution of 80 μrad (RMSE: 20.6 μrad). The atmospheric effects were evaluated using a collimated beam at 635 nm wavelength and 2.5 mW output power over a round-trip link of 130 m. The experimental results demonstrate that BW and AoA fluctuations exhibit dispersive probabilistic distributions depending on the strength of optical turbulence expressed with Cn2. Notably, the correlation of the beam centroid and AoA in both x- and y-directions moved with correlation coefficients between −0.72 and + 0.82. This work clarifies the necessity of distinguishing the two atmospheric effects (BW and AoA) and our findings offer valuable insights for optimizing the single-mode fiber-coupled FSO communication systems and high-precision laser-directed systems.
{"title":"Real-time monitoring of beam wander and angle-of-arrival fluctuation under atmospheric turbulence for efficient laser coupling to single-mode optical fibers","authors":"Jeonghun Seong , Jaehyeon Lim , Gibeen Gu , Taewon Kim , Hyeokin Kang , Sunghun Lee , Wooseok Park , Hyosang Yoon , Young-Jin Kim","doi":"10.1016/j.optcom.2026.132920","DOIUrl":"10.1016/j.optcom.2026.132920","url":null,"abstract":"<div><div>Atmospheric effects degrade the performance of free-space optical links, which has prompted extensive research over several decades. Most studies have focused on scintillation, which describes the fluctuation in received optical power at the receiver. Meanwhile, the beam wander (BW) and angle-of-arrival (AoA) fluctuations are two factors that directly impact the position and angular movement of the optical beam in free-space. These effects are especially crucial for single-mode fiber-coupled free-space optical (FSO) communication systems to achieve high bandwidth and large-capacity data transmission via well-established fiber-optic communication components. However, despite their significance, detailed studies on BW and AoA fluctuations have not been addressed. In this study, we present a real-time monitoring system capable of simultaneously measuring the BW and AoA fluctuations with high precision using a single commercial camera; the system achieves a positional resolution within 80 μm (RMSE: 30.2 μm) and an angular resolution of 80 μrad (RMSE: 20.6 μrad). The atmospheric effects were evaluated using a collimated beam at 635 nm wavelength and 2.5 mW output power over a round-trip link of 130 m. The experimental results demonstrate that BW and AoA fluctuations exhibit dispersive probabilistic distributions depending on the strength of optical turbulence expressed with <em>C</em><sub><em>n</em></sub><sup><em>2</em></sup>. Notably, the correlation of the beam centroid and AoA in both x- and y-directions moved with correlation coefficients between −0.72 and + 0.82. This work clarifies the necessity of distinguishing the two atmospheric effects (BW and AoA) and our findings offer valuable insights for optimizing the single-mode fiber-coupled FSO communication systems and high-precision laser-directed systems.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"607 ","pages":"Article 132920"},"PeriodicalIF":2.5,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026023","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 : 2026-01-16DOI: 10.1016/j.optcom.2026.132921
Shubin Hua , Ning Zhang , Yina Hai , Deqiang Ding , Peng Yin , Zhaolong He , Fangyu Sun , Huidong Guo , Wenda Shao
To enhance the concentration efficiency and space utilization of the concentrator, a stepped integrated photovoltaic concentrating system without Light Leakage has been developed. The interrelationships between the geometric concentration ratio, parabolic coefficient, light guide plate (LGP) step height, and the height of the outermost concentrating module have been thoroughly investigated. To address the issue of light leakage caused by the low acceptance angle after light coupling into the LGP, a design method for a stepped leak-proof light guide plate has been proposed. Considering the solar divergence angle, Fresnel losses, and material absorption, LightTools optical simulation software was used to trace the light rays of the designed system, revealing the impact of the LGP step height, the height of the outermost concentrating module, and the acceptance half-angle on the system's optical efficiency. The simulation results show that, when the step height is 0.1 cm, the geometric concentration ratio reaches 306, with a concentration efficiency of 64.70 %. When the step height increases to 0.5 cm, the geometric concentration ratio decreases to 62, while the concentration efficiency increases to 83.62 %. Additionally, as the axial error increases from 0° to 0.3°, the average energy flux density decreases from 7011.37 W/m2 to 6320.74 W/m2, with the concentrator efficiency reaching approximately 90.14 % of the peak value. In contrast, as the alignment error increases from 0° to 0.3°, the average energy flux density decreases from 7011.37 W/m2 to 6674.62 W/m2, and the concentrator efficiency reaches approximately 95.1 % of the peak value. Experimental results indicate that the designed concentrator achieves a peak concentration efficiency of 55.8 % at noon.
{"title":"The design method of stepped integrated photovoltaic concentrator without light leakage","authors":"Shubin Hua , Ning Zhang , Yina Hai , Deqiang Ding , Peng Yin , Zhaolong He , Fangyu Sun , Huidong Guo , Wenda Shao","doi":"10.1016/j.optcom.2026.132921","DOIUrl":"10.1016/j.optcom.2026.132921","url":null,"abstract":"<div><div>To enhance the concentration efficiency and space utilization of the concentrator, a stepped integrated photovoltaic concentrating system without Light Leakage has been developed. The interrelationships between the geometric concentration ratio, parabolic coefficient, light guide plate (LGP) step height, and the height of the outermost concentrating module have been thoroughly investigated. To address the issue of light leakage caused by the low acceptance angle after light coupling into the LGP, a design method for a stepped leak-proof light guide plate has been proposed. Considering the solar divergence angle, Fresnel losses, and material absorption, LightTools optical simulation software was used to trace the light rays of the designed system, revealing the impact of the LGP step height, the height of the outermost concentrating module, and the acceptance half-angle on the system's optical efficiency. The simulation results show that, when the step height is 0.1 cm, the geometric concentration ratio reaches 306, with a concentration efficiency of 64.70 %. When the step height increases to 0.5 cm, the geometric concentration ratio decreases to 62, while the concentration efficiency increases to 83.62 %. Additionally, as the axial error increases from 0° to 0.3°, the average energy flux density decreases from 7011.37 W/m<sup>2</sup> to 6320.74 W/m<sup>2</sup>, with the concentrator efficiency reaching approximately 90.14 % of the peak value. In contrast, as the alignment error increases from 0° to 0.3°, the average energy flux density decreases from 7011.37 W/m<sup>2</sup> to 6674.62 W/m<sup>2</sup>, and the concentrator efficiency reaches approximately 95.1 % of the peak value. Experimental results indicate that the designed concentrator achieves a peak concentration efficiency of 55.8 % at noon.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"607 ","pages":"Article 132921"},"PeriodicalIF":2.5,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025931","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 : 2026-01-15DOI: 10.1016/j.optcom.2026.132910
Chon-Fai Kam
We investigate classical nonlinear optical analogues of excited-state quantum phase transitions (ESQPTs) within a squeezing-enhanced generalized Lipkin–Meshkov–Glick (LMG) model, focusing on polarization dynamics in optical fibers with tetragonal symmetry. Through systematic mapping of coupled-mode equations across crystal symmetries, we identify a novel non-conventional squeezing term that induces classical bifurcations—even without a linear rotor term. These bifurcations, analyzed in detail on the Poincaré sphere, correspond—via established semiclassical correspondence—to singularities in excited-state spectra characteristic of ESQPTs in the quantum LMG counterpart. Our findings highlight deep classical–quantum interplay in optical systems, providing a controllable room-temperature platform for simulating mean-field limits of many-body quantum criticality, with potential applications in quantum metrology and simulation. Full quantum spectral analysis is deferred to future work.
{"title":"Classical optical analogues of excited-state quantum phase transitions in a squeezing-enhanced generalized Lipkin–Meshkov–Glick model","authors":"Chon-Fai Kam","doi":"10.1016/j.optcom.2026.132910","DOIUrl":"10.1016/j.optcom.2026.132910","url":null,"abstract":"<div><div>We investigate classical nonlinear optical analogues of excited-state quantum phase transitions (ESQPTs) within a squeezing-enhanced generalized Lipkin–Meshkov–Glick (LMG) model, focusing on polarization dynamics in optical fibers with tetragonal symmetry. Through systematic mapping of coupled-mode equations across crystal symmetries, we identify a novel non-conventional squeezing term that induces classical bifurcations—even without a linear rotor term. These bifurcations, analyzed in detail on the Poincaré sphere, correspond—via established semiclassical correspondence—to singularities in excited-state spectra characteristic of ESQPTs in the quantum LMG counterpart. Our findings highlight deep classical–quantum interplay in optical systems, providing a controllable room-temperature platform for simulating mean-field limits of many-body quantum criticality, with potential applications in quantum metrology and simulation. Full quantum spectral analysis is deferred to future work.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"606 ","pages":"Article 132910"},"PeriodicalIF":2.5,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981667","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 : 2026-01-15DOI: 10.1016/j.optcom.2026.132913
Wenxuan Pei, Zhen Zhou, Xinyu Li, Yang Lu, Wentao Li, Anxu Huang, Di Feng, Hongchen Jiao, Lishuang Feng
We present a polarization-insensitive electro-optic Mach-Zehnder modulator on a thin-film lithium niobate and silicon nitride heterogeneous integration platform. The design employs a Mach-Zehnder interferometer structure with integrated polarization rotators at the midpoint of each arm, enabling bidirectional TE0/TM0 mode conversion. This symmetric configuration ensures equal modulation efficiency for both polarization states, achieving polarization-insensitive operation. Through finite-difference time-domain and finite-element method simulations, we optimize the device design and evaluate its performance. The simulation results show identical modulation efficiency and comparable insertion loss for both polarization states. The proposed modulator is well-suited for optical communication systems and data centers, where polarization-insensitive operation is essential.
{"title":"Polarization-insensitive electro-optic mach-zehnder modulator on thin-film lithium niobate-silicon nitride heterogeneous platform","authors":"Wenxuan Pei, Zhen Zhou, Xinyu Li, Yang Lu, Wentao Li, Anxu Huang, Di Feng, Hongchen Jiao, Lishuang Feng","doi":"10.1016/j.optcom.2026.132913","DOIUrl":"10.1016/j.optcom.2026.132913","url":null,"abstract":"<div><div>We present a polarization-insensitive electro-optic Mach-Zehnder modulator on a thin-film lithium niobate and silicon nitride heterogeneous integration platform. The design employs a Mach-Zehnder interferometer structure with integrated polarization rotators at the midpoint of each arm, enabling bidirectional TE<sub>0</sub>/TM<sub>0</sub> mode conversion. This symmetric configuration ensures equal modulation efficiency for both polarization states, achieving polarization-insensitive operation. Through finite-difference time-domain and finite-element method simulations, we optimize the device design and evaluate its performance. The simulation results show identical modulation efficiency and comparable insertion loss for both polarization states. The proposed modulator is well-suited for optical communication systems and data centers, where polarization-insensitive operation is essential.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"606 ","pages":"Article 132913"},"PeriodicalIF":2.5,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039190","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 : 2026-01-14DOI: 10.1016/j.optcom.2026.132895
Haoxin Tian , Hanyu Zhan , David Voelz , Lejun Chen , Jizhou Lai
The Fried parameter and coherence radius are two fundamental measures that characterize the spatial resolution effects of atmospheric turbulence on optical propagation and imaging. Here, their calculations for spherical and plane waves in von Karman turbulence are theoretical developed that includes the effects of both nonzero inner scale and finite outer scale. The simple analytic expressions are also derived for making the results easy to use. Then the split-step wave optics simulations are performed for modeling the long-exposure point spread function and mutual coherence function through von Karman turbulence for comparison. The expressions and numerical results agree well throughout the weak to strong turbulent scattering regimes.
{"title":"Long-exposure fried parameter and coherence radius through von Karman atmospheric turbulence","authors":"Haoxin Tian , Hanyu Zhan , David Voelz , Lejun Chen , Jizhou Lai","doi":"10.1016/j.optcom.2026.132895","DOIUrl":"10.1016/j.optcom.2026.132895","url":null,"abstract":"<div><div>The Fried parameter and coherence radius are two fundamental measures that characterize the spatial resolution effects of atmospheric turbulence on optical propagation and imaging. Here, their calculations for spherical and plane waves in von Karman turbulence are theoretical developed that includes the effects of both nonzero inner scale and finite outer scale. The simple analytic expressions are also derived for making the results easy to use. Then the split-step wave optics simulations are performed for modeling the long-exposure point spread function and mutual coherence function through von Karman turbulence for comparison. The expressions and numerical results agree well throughout the weak to strong turbulent scattering regimes.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"607 ","pages":"Article 132895"},"PeriodicalIF":2.5,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145996208","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 : 2026-01-14DOI: 10.1016/j.optcom.2026.132903
Jian-Sheng Chen , Yu-Chen Huang , Xin Wang , Xian-Guang Fan , Yong Zuo
In recent years, the rotating Fourier transform spectrometer (R-FTS) has shown significant engineering potential in the field of dynamic fine analysis due to its advantages of 4 cm−1 high spectral resolution and 100 Hz high spectral scanning speed. However, it has been found that the parallelism error of the rotating refractor in R-FTS can significantly degrade the interference modulation depth, resulting in the loss of weak spectral features or a reduction in resolution. Based on the analysis of the R-FTS optical system incorporating non-ideal rotating refractor, this paper derives a computable mathematical model relating the wedge angle and rotation angle of the non-ideal parallel rotating refractor to the modulation depth, thereby revealing the transfer mechanism between parallelism error and modulation depth. Accordingly, a new assembly process for the rotating refractor is proposed, which relaxes the parallelism error tolerance from 6″ to 86″. Experimental results are in good agreement with the model predictions. This study provides a transferable design basis for tolerance allocation and alignment technology in rotating interferometers.
{"title":"Study on interference modulation of a rotating Fourier transform spectrometer","authors":"Jian-Sheng Chen , Yu-Chen Huang , Xin Wang , Xian-Guang Fan , Yong Zuo","doi":"10.1016/j.optcom.2026.132903","DOIUrl":"10.1016/j.optcom.2026.132903","url":null,"abstract":"<div><div>In recent years, the rotating Fourier transform spectrometer (R-FTS) has shown significant engineering potential in the field of dynamic fine analysis due to its advantages of 4 cm<sup>−1</sup> high spectral resolution and 100 Hz high spectral scanning speed. However, it has been found that the parallelism error of the rotating refractor in R-FTS can significantly degrade the interference modulation depth, resulting in the loss of weak spectral features or a reduction in resolution. Based on the analysis of the R-FTS optical system incorporating non-ideal rotating refractor, this paper derives a computable mathematical model relating the wedge angle and rotation angle of the non-ideal parallel rotating refractor to the modulation depth, thereby revealing the transfer mechanism between parallelism error and modulation depth. Accordingly, a new assembly process for the rotating refractor is proposed, which relaxes the parallelism error tolerance from 6″ to 86″. Experimental results are in good agreement with the model predictions. This study provides a transferable design basis for tolerance allocation and alignment technology in rotating interferometers.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"606 ","pages":"Article 132903"},"PeriodicalIF":2.5,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039185","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}
Novel reflection and transparent optical elements containing replicas of rough surface areas were experimentally studied as an alternative to traditional security holograms. These elements provide a physically unclonable function while allowing for mass replication from a master stamp. The sensitivity of the replica identification process to positioning inaccuracies was determined, and methods for reducing this sensitivity were proposed and experimentally tested. This allowed for an increase in permissible lateral shifts by more than an order of magnitude. For transparent elements, the permissible tilt value increased by two orders of magnitude compared to reflection elements.
{"title":"Identification of rough surface replicas","authors":"A.M. Smolovich , A.P. Orlov , A.V. Frolov , L.D. Klebanov , I.D. Laktaev , P.A. Smolovich , O.V. Butov","doi":"10.1016/j.optcom.2026.132915","DOIUrl":"10.1016/j.optcom.2026.132915","url":null,"abstract":"<div><div>Novel reflection and transparent optical elements containing replicas of rough surface areas were experimentally studied as an alternative to traditional security holograms. These elements provide a physically unclonable function while allowing for mass replication from a master stamp. The sensitivity of the replica identification process to positioning inaccuracies was determined, and methods for reducing this sensitivity were proposed and experimentally tested. This allowed for an increase in permissible lateral shifts by more than an order of magnitude. For transparent elements, the permissible tilt value increased by two orders of magnitude compared to reflection elements.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"606 ","pages":"Article 132915"},"PeriodicalIF":2.5,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981657","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 : 2026-01-13DOI: 10.1016/j.optcom.2026.132912
Songchan Cui , Hang Xu , Boyan Sun , Xiaohong Hu , Chang Niu , Hua Gao
Multimodal high-Q resonances are crucial for various advanced photonic devices. Surface lattice resonances (SLRs) represent a prominent approach for achieving high-Q resonances. However, their practical application is constrained by the stringent requirement for refractive-index-matching and the limited number of resonant modes. In this work, we propose a structure that supports multiple ultrahigh-Q guided-mode lattice resonances (GLRs) in an asymmetric environment by integrating a U-shaped split-ring resonator (U-SRR) array on a dielectric waveguide. By increasing the waveguide thickness, this platform not only readily achieves Q-factors exceeding 104, substantially surpassing conventional SLRs, but also increases the number of GLRs in groups. We theoretically elucidate the excitation mechanism of GLRs and the physical origin of their high Q-factors. Based on this mechanism, analytical formulas were derived to reliably predict the resonant wavelengths of these multiple-order GLRs. This work provides a straightforward method for achieving tunable, high-Q multimodal resonances, promising applications in advanced nanophotonic devices such as multimodal lasers and multiparameter sensors.
{"title":"Multimodal ultrahigh-Q lattice resonances supported by a U-shaped nanoarray integrated on a dielectric waveguide","authors":"Songchan Cui , Hang Xu , Boyan Sun , Xiaohong Hu , Chang Niu , Hua Gao","doi":"10.1016/j.optcom.2026.132912","DOIUrl":"10.1016/j.optcom.2026.132912","url":null,"abstract":"<div><div>Multimodal high-Q resonances are crucial for various advanced photonic devices. Surface lattice resonances (SLRs) represent a prominent approach for achieving high-Q resonances. However, their practical application is constrained by the stringent requirement for refractive-index-matching and the limited number of resonant modes. In this work, we propose a structure that supports multiple ultrahigh-Q guided-mode lattice resonances (GLRs) in an asymmetric environment by integrating a U-shaped split-ring resonator (U-SRR) array on a dielectric waveguide. By increasing the waveguide thickness, this platform not only readily achieves Q-factors exceeding 10<sup>4</sup>, substantially surpassing conventional SLRs, but also increases the number of GLRs in groups. We theoretically elucidate the excitation mechanism of GLRs and the physical origin of their high Q-factors. Based on this mechanism, analytical formulas were derived to reliably predict the resonant wavelengths of these multiple-order GLRs. This work provides a straightforward method for achieving tunable, high-Q multimodal resonances, promising applications in advanced nanophotonic devices such as multimodal lasers and multiparameter sensors.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"606 ","pages":"Article 132912"},"PeriodicalIF":2.5,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039187","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}
A scheme to improve the measurement velocity in self-mixing interferometry is proposed. The frequency shift rate is set to be greater than the relaxation oscillation frequency to increase the space of laser Doppler shift to increase the measurement velocity of the system. The actual measuring velocity of the system reaches ±1000 mm/s, and the experimental results verify the effectiveness of the scheme. The root mean square errors of the positive and negative velocity measurements are 0.00633 mm/s and 0.00655 mm/s, and the linearity is 1.942 × 10−5 and 1.916 × 10−5, which gave the system high precision and good linearity. The overall structure of the system is simple, easy to adjust the optical path, in the actual industrial production as a sensing module for online monitoring of processing machinery.
{"title":"Improving the measurement velocity in self-mixing interferometry","authors":"Jialong Ren , Peng Wu , Haonan Zhong , Yongxing Liu , Jing Zhang","doi":"10.1016/j.optcom.2025.132691","DOIUrl":"10.1016/j.optcom.2025.132691","url":null,"abstract":"<div><div>A scheme to improve the measurement velocity in self-mixing interferometry is proposed. The frequency shift rate is set to be greater than the relaxation oscillation frequency to increase the space of laser Doppler shift to increase the measurement velocity of the system. The actual measuring velocity of the system reaches ±1000 mm/s, and the experimental results verify the effectiveness of the scheme. The root mean square errors of the positive and negative velocity measurements are 0.00633 mm/s and 0.00655 mm/s, and the linearity is 1.942 × 10<sup>−5</sup> and 1.916 × 10<sup>−5</sup>, which gave the system high precision and good linearity. The overall structure of the system is simple, easy to adjust the optical path, in the actual industrial production as a sensing module for online monitoring of processing machinery.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"607 ","pages":"Article 132691"},"PeriodicalIF":2.5,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026030","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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