Pub Date : 2025-02-26DOI: 10.1016/j.optcom.2025.131670
Guang-Rui Jia , Chen Chen , Hui-Xia Kang , Jia-Qi Liu , Ming-Hu Yuan , Xue-Bin Bian
Terahertz (THz) radiation from quasicrystals in intense laser fields is simulated by solving the time-dependent Schrödinger equation (TDSE) in momentum space. Wave function information can be comprehensively reserved in momentum space without absorbing boundary conditions, which is different from coordinate space. The results of numerical calculations indicate that broadband THz radiation can be efficiently generated in one-dimensional Fibonacci quasicrystals due to their inherent quasi-periodic properties. In the two-color laser field, THz radiation is predominantly generated by the second harmonic field, which is slightly higher than that by the monochromatic field. Furthermore, the peak intensity of THz radiation exhibits a third-order nonlinear relationship with respect to the pump laser intensity. This work sheds light on the possibility of quasicrystals to serve as new THz sources.
{"title":"Laser-induced terahertz radiation from one-dimensional Fibonacci quasicrystals","authors":"Guang-Rui Jia , Chen Chen , Hui-Xia Kang , Jia-Qi Liu , Ming-Hu Yuan , Xue-Bin Bian","doi":"10.1016/j.optcom.2025.131670","DOIUrl":"10.1016/j.optcom.2025.131670","url":null,"abstract":"<div><div>Terahertz (THz) radiation from quasicrystals in intense laser fields is simulated by solving the time-dependent Schrödinger equation (TDSE) in momentum space. Wave function information can be comprehensively reserved in momentum space without absorbing boundary conditions, which is different from coordinate space. The results of numerical calculations indicate that broadband THz radiation can be efficiently generated in one-dimensional Fibonacci quasicrystals due to their inherent quasi-periodic properties. In the two-color laser field, THz radiation is predominantly generated by the second harmonic field, which is slightly higher than that by the monochromatic field. Furthermore, the peak intensity of THz radiation exhibits a third-order nonlinear relationship with respect to the pump laser intensity. This work sheds light on the possibility of quasicrystals to serve as new THz sources.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"582 ","pages":"Article 131670"},"PeriodicalIF":2.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143520066","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 : 2025-02-26DOI: 10.1016/j.optcom.2025.131671
Tazeen Zahra , Ijaz Ahmad , M. Abdul Mohemine , Aqeel A. Syed , Saleh S. Alarfaji , Muhib Ullah , Wajid Ali , Zahir Muhammad
This study investigates arrayed split-ring nanostructures within a semiconductor-metal-semiconductor (SMS) configuration, achieving an impressive peak light absorption of 99.9 % in the near-infrared (NIR) spectrum. This high absorption efficiency is primarily attributed to Fabry-Pérot cavity resonance, which enables strong coupling of magnetic and electric fields within the structure. The resonant peak can be precisely tailored by altering the geometric parameters of the split rings, including thickness, periodicity, and other structural features, offering significant flexibility for device optimization. Compared to conventional metal-insulator-metal (MIM) setups, the SMS configuration not only delivers comparable performance but also provides a cost-effective and scalable alternative for practical applications. The design demonstrates robust sensing capabilities, achieving a sensitivity of 1000 nm/RIU in the visible spectrum and 553.57 nm/RIU in the NIR region. These characteristics highlight the potential of the proposed structure for advanced applications in photonic devices, including light-harvesting systems and highly sensitive optical sensors.
{"title":"Tunable plasmonic perfect absorbers for enhanced biosensing and environmental detection","authors":"Tazeen Zahra , Ijaz Ahmad , M. Abdul Mohemine , Aqeel A. Syed , Saleh S. Alarfaji , Muhib Ullah , Wajid Ali , Zahir Muhammad","doi":"10.1016/j.optcom.2025.131671","DOIUrl":"10.1016/j.optcom.2025.131671","url":null,"abstract":"<div><div>This study investigates arrayed split-ring nanostructures within a semiconductor-metal-semiconductor (SMS) configuration, achieving an impressive peak light absorption of 99.9 % in the near-infrared (NIR) spectrum. This high absorption efficiency is primarily attributed to Fabry-Pérot cavity resonance, which enables strong coupling of magnetic and electric fields within the structure. The resonant peak can be precisely tailored by altering the geometric parameters of the split rings, including thickness, periodicity, and other structural features, offering significant flexibility for device optimization. Compared to conventional metal-insulator-metal (MIM) setups, the SMS configuration not only delivers comparable performance but also provides a cost-effective and scalable alternative for practical applications. The design demonstrates robust sensing capabilities, achieving a sensitivity of 1000 nm/RIU in the visible spectrum and 553.57 nm/RIU in the NIR region. These characteristics highlight the potential of the proposed structure for advanced applications in photonic devices, including light-harvesting systems and highly sensitive optical sensors.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"582 ","pages":"Article 131671"},"PeriodicalIF":2.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519852","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}
The utilization of metalens is highly regarded as a promising solution for the advancement of planar optical systems and is anticipated to find extensive applications in areas such as near-eye display. Ensuring the elimination of chromatic aberration in metalens is imperative for their effective implementation in color imaging and display. This paper proposes a novel design strategy for achromatic metalens based on regional dispersion engineering, employing an algorithm to intelligently select rectangular nanostructures that can simultaneously fulfill the phase requirements for correcting chromatic aberration across different spectral bands. The results demonstrate that within the wavelength range of 450–630 nm, a vertical focal error of no more than 1.5 μm and a focal length deviation of 8.56% can be achieved. The average focusing efficiency is recorded at 10.27%. Furthermore, multi-focal achromatic metalens can also be obtained. For demonstration purposes, a dual-focal achromatic metalens (DF-AMLs) with vertical focal errors not exceeding 0.5 μm and average focusing efficiencies of 6.58% and 7.96% respectively is achieved. This DF-AMLs holds significant promise for applications in microscopy and 3D displays, providing new insights and possibilities for advancing related technologies.
{"title":"Simulation study of dual-focal achromatic metalens based on regional dispersion engineering","authors":"Rentao Huang , Yuyan Peng , Weiquan Yang , Zhenyou Zou , Xiongtu Zhou , Tailiang Guo , Chaoxing Wu , Yongai Zhang","doi":"10.1016/j.optcom.2025.131673","DOIUrl":"10.1016/j.optcom.2025.131673","url":null,"abstract":"<div><div>The utilization of metalens is highly regarded as a promising solution for the advancement of planar optical systems and is anticipated to find extensive applications in areas such as near-eye display. Ensuring the elimination of chromatic aberration in metalens is imperative for their effective implementation in color imaging and display. This paper proposes a novel design strategy for achromatic metalens based on regional dispersion engineering, employing an algorithm to intelligently select rectangular nanostructures that can simultaneously fulfill the phase requirements for correcting chromatic aberration across different spectral bands. The results demonstrate that within the wavelength range of 450–630 nm, a vertical focal error of no more than 1.5 μm and a focal length deviation of 8.56% can be achieved. The average focusing efficiency is recorded at 10.27%. Furthermore, multi-focal achromatic metalens can also be obtained. For demonstration purposes, a dual-focal achromatic metalens (DF-AMLs) with vertical focal errors not exceeding 0.5 μm and average focusing efficiencies of 6.58% and 7.96% respectively is achieved. This DF-AMLs holds significant promise for applications in microscopy and 3D displays, providing new insights and possibilities for advancing related technologies.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"582 ","pages":"Article 131673"},"PeriodicalIF":2.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527409","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 : 2025-02-25DOI: 10.1016/j.optcom.2025.131632
Yifan Guo , Minglei Li , Yu Qian , Liping Gong , Zhuqing Zhu , Bing Gu
The all-optical diffractive deep neural network (D2NN) utilizes passive diffraction layers to perform machine learning, achieving complex functions at the speed of light, akin to traditional computer-based neural networks. This paper explores a dual-multiplexed coaxial hologram reconstruction technique based on an all-optical D2NN. In this approach, the input holograms are processed by two sets of transmissive layers trained in parallel. By exploiting the inherent parallelism of optical systems, we divide the optical path into two jointly trained diffractive networks that work in parallel, reducing crosstalk and optical signal coupling between the two images. The results show that the dual-multiplexed coaxial holograms can be simultaneously reconstructed by both sets of layers, effectively eliminating twin image artifacts. The structural similarity index (SSIM) and peak signal-to-noise ratio (PSNR) of the reconstructed image improve by 14.29% and 25%, respectively, compared to reconstructions of a single hologram using all-optical D2NN. Additionally, we assess the network’s performance with noisy and partially occluded holograms, demonstrating that, unlike conventional methods, this approach significantly enhances image quality, even under salt-and-pepper noise or partial occlusion. These findings offer new insights into the real-time reconstruction of dual-multiplexed digital holograms.
{"title":"Dual-multiplexed coaxial holograms reconstruction based all-optical diffraction deep neural network","authors":"Yifan Guo , Minglei Li , Yu Qian , Liping Gong , Zhuqing Zhu , Bing Gu","doi":"10.1016/j.optcom.2025.131632","DOIUrl":"10.1016/j.optcom.2025.131632","url":null,"abstract":"<div><div>The all-optical diffractive deep neural network (D2NN) utilizes passive diffraction layers to perform machine learning, achieving complex functions at the speed of light, akin to traditional computer-based neural networks. This paper explores a dual-multiplexed coaxial hologram reconstruction technique based on an all-optical D2NN. In this approach, the input holograms are processed by two sets of transmissive layers trained in parallel. By exploiting the inherent parallelism of optical systems, we divide the optical path into two jointly trained diffractive networks that work in parallel, reducing crosstalk and optical signal coupling between the two images. The results show that the dual-multiplexed coaxial holograms can be simultaneously reconstructed by both sets of layers, effectively eliminating twin image artifacts. The structural similarity index (SSIM) and peak signal-to-noise ratio (PSNR) of the reconstructed image improve by 14.29% and 25%, respectively, compared to reconstructions of a single hologram using all-optical D2NN. Additionally, we assess the network’s performance with noisy and partially occluded holograms, demonstrating that, unlike conventional methods, this approach significantly enhances image quality, even under salt-and-pepper noise or partial occlusion. These findings offer new insights into the real-time reconstruction of dual-multiplexed digital holograms.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"582 ","pages":"Article 131632"},"PeriodicalIF":2.2,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509937","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 : 2025-02-25DOI: 10.1016/j.optcom.2025.131633
Ziyi Tang, Qiurong Yan, Yi Li, Jinwei Yan
In Single-pixel imaging (SPI), reconstructing high-quality images at low measurement rates remains a significant research challenge. However, existing methods face issues such as insufficient image reconstruction quality. This paper proposes a novel reconstruction approach using a score-based diffusion model to address this challenge. First, to effectively apply the score-based diffusion model to SPI, we introduce a measurement likelihood representation grounded in the imaging system. This likelihood term, which incorporates measurement information, serves as a conditional constraint in the reverse diffusion process for image reconstruction. Additionally, we propose a posterior mean estimation network to more accurately predict the posterior mean of the target image, thereby improving imaging quality of SPI. Experimental results demonstrate that our proposed method outperforms the state-of-the-art SPI techniques across various measurement rates. Furthermore, ablation studies and noise robustness tests further validate the effectiveness and practical applicability of the proposed approach.
{"title":"Enhanced single-pixel imaging base on posterior mean prediction using a score-based diffusion model","authors":"Ziyi Tang, Qiurong Yan, Yi Li, Jinwei Yan","doi":"10.1016/j.optcom.2025.131633","DOIUrl":"10.1016/j.optcom.2025.131633","url":null,"abstract":"<div><div>In Single-pixel imaging (SPI), reconstructing high-quality images at low measurement rates remains a significant research challenge. However, existing methods face issues such as insufficient image reconstruction quality. This paper proposes a novel reconstruction approach using a score-based diffusion model to address this challenge. First, to effectively apply the score-based diffusion model to SPI, we introduce a measurement likelihood representation grounded in the imaging system. This likelihood term, which incorporates measurement information, serves as a conditional constraint in the reverse diffusion process for image reconstruction. Additionally, we propose a posterior mean estimation network to more accurately predict the posterior mean of the target image, thereby improving imaging quality of SPI. Experimental results demonstrate that our proposed method outperforms the state-of-the-art SPI techniques across various measurement rates. Furthermore, ablation studies and noise robustness tests further validate the effectiveness and practical applicability of the proposed approach.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"582 ","pages":"Article 131633"},"PeriodicalIF":2.2,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143520065","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 : 2025-02-25DOI: 10.1016/j.optcom.2025.131668
Weihua Zhang , Zhaohui Li , Yurong Wang , Haifeng Pan , Xiuliang Chen , Kun Huang , Guang Wu
A high-speed single-photon LiDAR (light detection and ranging) has been reported, which incorporates a novel trajectory compensation scanning method. This innovative approach significantly improves the airborne LiDAR's ability to reconstruct targets compared to traditional scanning methods by adding a scan parallel to the flight direction with an amplitude close to the inter-row space. The simulation indicates that the trajectory compensation scanning method increased the area illuminated by the laser footprint by 70% compared to the traditional ‘Z’ pattern scanning. It overcomes the issue of uneven distribution of sampling points that arises from high-speed movement of the aircraft or insufficient scan frequency. The imaging results of targets 17 m away strongly support that this approach can improve the resolution for airborne single-photon LiDARs.
{"title":"High-resolution single-photon imaging by trajectory compensation scanning","authors":"Weihua Zhang , Zhaohui Li , Yurong Wang , Haifeng Pan , Xiuliang Chen , Kun Huang , Guang Wu","doi":"10.1016/j.optcom.2025.131668","DOIUrl":"10.1016/j.optcom.2025.131668","url":null,"abstract":"<div><div>A high-speed single-photon LiDAR (light detection and ranging) has been reported, which incorporates a novel trajectory compensation scanning method. This innovative approach significantly improves the airborne LiDAR's ability to reconstruct targets compared to traditional scanning methods by adding a scan parallel to the flight direction with an amplitude close to the inter-row space. The simulation indicates that the trajectory compensation scanning method increased the area illuminated by the laser footprint by 70% compared to the traditional ‘Z’ pattern scanning. It overcomes the issue of uneven distribution of sampling points that arises from high-speed movement of the aircraft or insufficient scan frequency. The imaging results of targets 17 m away strongly support that this approach can improve the resolution for airborne single-photon LiDARs.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"582 ","pages":"Article 131668"},"PeriodicalIF":2.2,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529627","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 : 2025-02-25DOI: 10.1016/j.optcom.2025.131664
Tianqi Gu , Yihao Zhang , Dawei Tang , Bing Fang
Over recent decades, metasurfaces have achieved significant advancements in the development of integrated and miniaturized optical devices. A notable area of research within this field is the development of metalenses. In this study, we propose a broadband achromatic metalens that operates across a wide wavelength range from 9.6 μm to 11.6 μm. For the initial metalens, based on the geometric phase principle, micro adjustments are made to the dimensions of individual nanopillars to compensate for phase deviations. To efficiently optimize this metalens, we employ a hierarchical iteration strategy that divides the optimization space into overlapping groups, significantly reducing the loss rate and computational effort. Within each group, an improved reptile search algorithm (IRSA) is proposed to find the optimal solution. This algorithm incorporates a quantum mutation strategy to address the issues of premature convergence and imbalance during its search process. The results indicate that the proposed metalens attains an average focusing efficiency of 39.7% and the correction of chromatic aberration is achieved with a coefficient of variation of only 2.7%. This achievement represents a significant advancement in the field of achromatic metalenses.
{"title":"An all-dielectric achromatic metalens with high performance in the long-wavelength infrared regime","authors":"Tianqi Gu , Yihao Zhang , Dawei Tang , Bing Fang","doi":"10.1016/j.optcom.2025.131664","DOIUrl":"10.1016/j.optcom.2025.131664","url":null,"abstract":"<div><div>Over recent decades, metasurfaces have achieved significant advancements in the development of integrated and miniaturized optical devices. A notable area of research within this field is the development of metalenses. In this study, we propose a broadband achromatic metalens that operates across a wide wavelength range from 9.6 μm to 11.6 μm. For the initial metalens, based on the geometric phase principle, micro adjustments are made to the dimensions of individual nanopillars to compensate for phase deviations. To efficiently optimize this metalens, we employ a hierarchical iteration strategy that divides the optimization space into overlapping groups, significantly reducing the loss rate and computational effort. Within each group, an improved reptile search algorithm (IRSA) is proposed to find the optimal solution. This algorithm incorporates a quantum mutation strategy to address the issues of premature convergence and imbalance during its search process. The results indicate that the proposed metalens attains an average focusing efficiency of 39.7% and the correction of chromatic aberration is achieved with a coefficient of variation of only 2.7%. This achievement represents a significant advancement in the field of achromatic metalenses.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"582 ","pages":"Article 131664"},"PeriodicalIF":2.2,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526747","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 : 2025-02-25DOI: 10.1016/j.optcom.2025.131667
Sung-Min Jung , Kanghee Won
Inorganic colloidal quantum-dot light-emitting diodes (QD-LEDs) have emerged as highly promising devices for display and lighting applications, owing to their exceptional colour properties such as tunable emission wavelength and superior colour saturation. However, the complexity of the multilayered device architecture causes wavelength-dependent angular colour variations, deteriorating colour performance. In this study, the angular-dependent chromaticity shift and correlated colour temperature (CCT) variations of a white QD-LED device comprised of red, green, and blue devices are investigated using a systematic optimisation framework supported by extensive optical simulations. By employing the optical transfer matrix method and a discrete grid search method, it is found that the angular colour properties are highly sensitive to the thickness configurations of the multiple layers, emphasising the importance of precise architectural optimisation. Optimal layer thickness configurations are determined to minimise chromaticity shifts and ensure consistent CCT, achieving angular chromaticity differences below 0.02 and CCT values within 6500 ± 200 K over wide angular ranges. The proposed approach provides a robust methodology for advancing QD-LED technologies, ensuring reliable and consistent colour performance in both display and lighting applications.
{"title":"Computational analysis of angular colour variation in quantum-dot light-emitting diode devices","authors":"Sung-Min Jung , Kanghee Won","doi":"10.1016/j.optcom.2025.131667","DOIUrl":"10.1016/j.optcom.2025.131667","url":null,"abstract":"<div><div>Inorganic colloidal quantum-dot light-emitting diodes (QD-LEDs) have emerged as highly promising devices for display and lighting applications, owing to their exceptional colour properties such as tunable emission wavelength and superior colour saturation. However, the complexity of the multilayered device architecture causes wavelength-dependent angular colour variations, deteriorating colour performance. In this study, the angular-dependent chromaticity shift and correlated colour temperature (CCT) variations of a white QD-LED device comprised of red, green, and blue devices are investigated using a systematic optimisation framework supported by extensive optical simulations. By employing the optical transfer matrix method and a discrete grid search method, it is found that the angular colour properties are highly sensitive to the thickness configurations of the multiple layers, emphasising the importance of precise architectural optimisation. Optimal layer thickness configurations are determined to minimise chromaticity shifts and ensure consistent CCT, achieving angular chromaticity differences below 0.02 and CCT values within 6500 ± 200 K over wide angular ranges. The proposed approach provides a robust methodology for advancing QD-LED technologies, ensuring reliable and consistent colour performance in both display and lighting applications.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"582 ","pages":"Article 131667"},"PeriodicalIF":2.2,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529626","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 : 2025-02-25DOI: 10.1016/j.optcom.2025.131666
Jie Liu , Yi-Fan Tian , Zhao-Hua Yang , Zhi-Hao Zhao , Ling-An Wu , Yuan-Jin Yu
Single-pixel imaging (SPI) has the advantage of high detection sensitivity, which has great potential for imaging in low light. However, they still have some limitations; high sensitivity and high gain amplify noise as well as the signal, which results in poor image quality and low dynamic range. In this paper we implement a dual-band wide dynamic range SPI system that can simultaneously achieve near-infrared and visible light imaging at femtowatt levels, with an average of 3–17 fW incident on two Geiger-mode avalanche photodiodes. Time gating is employed to block unwanted noise; a contrast-to-noise ratio greater than 2 over a wide dynamic range of 0.006–1.08 mW/cm2 is achieved. Our system demonstrates an effective strategy for imaging under ultra-low-level illumination, and should find many applications in both research and industry.
{"title":"A wide spectral and intensity range single-pixel imaging system","authors":"Jie Liu , Yi-Fan Tian , Zhao-Hua Yang , Zhi-Hao Zhao , Ling-An Wu , Yuan-Jin Yu","doi":"10.1016/j.optcom.2025.131666","DOIUrl":"10.1016/j.optcom.2025.131666","url":null,"abstract":"<div><div>Single-pixel imaging (SPI) has the advantage of high detection sensitivity, which has great potential for imaging in low light. However, they still have some limitations; high sensitivity and high gain amplify noise as well as the signal, which results in poor image quality and low dynamic range. In this paper we implement a dual-band wide dynamic range SPI system that can simultaneously achieve near-infrared and visible light imaging at femtowatt levels, with an average of 3–17 fW incident on two Geiger-mode avalanche photodiodes. Time gating is employed to block unwanted noise; a contrast-to-noise ratio greater than 2 over a wide dynamic range of 0.006–1.08 mW/cm<sup>2</sup> is achieved. Our system demonstrates an effective strategy for imaging under ultra-low-level illumination, and should find many applications in both research and industry.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131666"},"PeriodicalIF":2.2,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580721","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 : 2025-02-25DOI: 10.1016/j.optcom.2025.131669
Dongyi Li , Fangjun Qin , Zhichao Ding , Hao Chen , Jiujiang Yan , Rui Xu , An Li , Haibo Zhang
To overcome the shortcomings of large losses and fluctuations in the power of output beam during the independent control of the frequency shift and power stabilization in the current cold atom interferometer, a new combined control method of laser frequency shift and power stabilization is proposed. The proposed method is based on the fact that the frequency shift and power stabilization are controlled by different control parameters of the acousto-optic modulator. Only one acousto-optic modulator is used to realize the two functions, which reduces the number of optical components and the power loss in the optical path, especially the number of acousto-optic modulators. Moreover, the proposed method can simultaneously adjust the frequency and power of the output beam through preprocessing of acousto-optic modulator drive signal, which significantly reduces the effect of the frequency shift on the stability of the output beam power. Compared with the existing independent control method, the new method reduces the loss of the output beam power by 10.6%, the RMS (root-mean-square) stability by a factor of six, and the overshoot by a factor of three. The new method not only significantly improves the optical utilization rate and the stability of the output beam power, but also contributes to the miniaturization of the laser system in the cold atom interferometer (CAI).
{"title":"A simplified and efficient method of laser frequency shifting and power stabilization","authors":"Dongyi Li , Fangjun Qin , Zhichao Ding , Hao Chen , Jiujiang Yan , Rui Xu , An Li , Haibo Zhang","doi":"10.1016/j.optcom.2025.131669","DOIUrl":"10.1016/j.optcom.2025.131669","url":null,"abstract":"<div><div>To overcome the shortcomings of large losses and fluctuations in the power of output beam during the independent control of the frequency shift and power stabilization in the current cold atom interferometer, a new combined control method of laser frequency shift and power stabilization is proposed. The proposed method is based on the fact that the frequency shift and power stabilization are controlled by different control parameters of the acousto-optic modulator. Only one acousto-optic modulator is used to realize the two functions, which reduces the number of optical components and the power loss in the optical path, especially the number of acousto-optic modulators. Moreover, the proposed method can simultaneously adjust the frequency and power of the output beam through preprocessing of acousto-optic modulator drive signal, which significantly reduces the effect of the frequency shift on the stability of the output beam power. Compared with the existing independent control method, the new method reduces the loss of the output beam power by 10.6%, the RMS (root-mean-square) stability by a factor of six, and the overshoot by a factor of three. The new method not only significantly improves the optical utilization rate and the stability of the output beam power, but also contributes to the miniaturization of the laser system in the cold atom interferometer (CAI).</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"582 ","pages":"Article 131669"},"PeriodicalIF":2.2,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526746","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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