Pub Date : 2024-08-23DOI: 10.1088/2040-8986/ad44ae
Hamza Gerçekcioğlu, Yahya Baykal
The on-axis scintillation index of laser beams is investigated by employing the Rytov method in a weakly turbulent oceanic medium for up/downlink coupling of laser communication between any underwater vehicles or divers. For vertical links, the formulation of the on-axis scintillation index of laser beams is derived analytically and evaluated for plane, collimated Gaussian and spherical beams in specific mediums, including the Atlantic Ocean at mid and low latitudes associating temperature and salinity changes at low latitudes, at mid latitude-summer and at mid latitude-winter. Using the scintillation index, bit error rate (BER) performance of M-pulse position modulation is investigated for these types of laser beams. The variations of the scintillation index against the uplink/downlink propagation distances, source size and zenith angle are examined, and BER variations versus the Kolmogorov microscale and the symbol orders, and results are compared. It is noted that the behavior of the scintillation index that depends on the relative strength of temperature and salinity fluctuations which changes in depth, is different for uplink/downlink and for each latitude due to its distinct characteristics. The source size that minimizes the scintillation index values is in the range of about 0.1 cm–0.2 cm for all latitudes.
通过在弱湍流海洋介质中采用 Rytov 方法研究了激光光束的轴向闪烁指数，用于任何水下航行器或潜水员之间激光通信的上/下行链路耦合。对于垂直链路，分析得出了激光光束的轴向闪烁指数，并对特定介质中的平面光束、准直高斯光束和球形光束进行了评估，包括中低纬度的大西洋，以及低纬度、中纬度-夏季和中纬度-冬季的温度和盐度变化。利用闪烁指数，研究了这些类型激光束的 M 脉冲位置调制的误码率（BER）性能。研究了闪烁指数随上行链路/下行链路传播距离、光源大小和天顶角的变化，以及误码率随科尔莫哥洛夫微尺度和符号阶数的变化，并对结果进行了比较。我们注意到，闪烁指数的行为取决于随深度变化的温度和盐度波动的相对强度，而上行链路/下行链路和每个纬度的闪烁指数因其不同的特性而各不相同。在所有纬度上，使闪烁指数值最小的光源尺寸范围约为 0.1 厘米-0.2 厘米。
{"title":"Bit error rate of M-pulse position modulated laser beams for vertical links operating in weak oceanic turbulence","authors":"Hamza Gerçekcioğlu, Yahya Baykal","doi":"10.1088/2040-8986/ad44ae","DOIUrl":"https://doi.org/10.1088/2040-8986/ad44ae","url":null,"abstract":"The on-axis scintillation index of laser beams is investigated by employing the Rytov method in a weakly turbulent oceanic medium for up/downlink coupling of laser communication between any underwater vehicles or divers. For vertical links, the formulation of the on-axis scintillation index of laser beams is derived analytically and evaluated for plane, collimated Gaussian and spherical beams in specific mediums, including the Atlantic Ocean at mid and low latitudes associating temperature and salinity changes at low latitudes, at mid latitude-summer and at mid latitude-winter. Using the scintillation index, bit error rate (BER) performance of M-pulse position modulation is investigated for these types of laser beams. The variations of the scintillation index against the uplink/downlink propagation distances, source size and zenith angle are examined, and BER variations versus the Kolmogorov microscale and the symbol orders, and results are compared. It is noted that the behavior of the scintillation index that depends on the relative strength of temperature and salinity fluctuations which changes in depth, is different for uplink/downlink and for each latitude due to its distinct characteristics. The source size that minimizes the scintillation index values is in the range of about 0.1 cm–0.2 cm for all latitudes.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"9 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-08-23DOI: 10.1088/2040-8986/ad6e9b
Yixuan Wu, Yu Liu, Haibitao Zhu, Shaohua Tao
Biometric technology, which authenticates identities with high reliability and stability by comparing the unique characteristics of human bodies, is widely used in the fields of electronic labeling, information security, access control, etc. Fingerprint recognition technology, which has the advantages of easy operation, fast recognition and high safety, has become the mainstream of the information decryption and access control application. In this paper, we proposed an optical fingerprint recognition method, which fulfilled recognition by comparing the characteristic intensity distributions of the diffraction fields of fingerprints. We carried out experiments for the recognition of fingerprints from different fingers and the same finger, and cropped fingerprints. The recognition results verified the feasibility of the proposed method. The method has advantages in terms of operation speed, recognition accuracy, and tolerance for partial information loss, and provides an effective way in optical sensing.
{"title":"An optical fingerprint recognition method based on diffraction field","authors":"Yixuan Wu, Yu Liu, Haibitao Zhu, Shaohua Tao","doi":"10.1088/2040-8986/ad6e9b","DOIUrl":"https://doi.org/10.1088/2040-8986/ad6e9b","url":null,"abstract":"Biometric technology, which authenticates identities with high reliability and stability by comparing the unique characteristics of human bodies, is widely used in the fields of electronic labeling, information security, access control, etc. Fingerprint recognition technology, which has the advantages of easy operation, fast recognition and high safety, has become the mainstream of the information decryption and access control application. In this paper, we proposed an optical fingerprint recognition method, which fulfilled recognition by comparing the characteristic intensity distributions of the diffraction fields of fingerprints. We carried out experiments for the recognition of fingerprints from different fingers and the same finger, and cropped fingerprints. The recognition results verified the feasibility of the proposed method. The method has advantages in terms of operation speed, recognition accuracy, and tolerance for partial information loss, and provides an effective way in optical sensing.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"11 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
In this study, a multifunctional metamaterial is proposed to effectively absorb terahertz (THz) radiation and shield against infrared (IR) emissions. The device comprises an IR shielding layer made of ZnS and SiO2, and a terahertz absorbing layer utilizing a ‘graphene—SiO2—gold’ sandwich-like structure. The properties of the metamaterial are investigated using the full-vector finite element method. The results indicate that the emissivity of the device is below 0.1 in the IR atmospheric window (8–14 μm), with absorption reaching 90% and a bandwidth of 2.42 THz in 2–6 THz. Furthermore, the device is certainly tolerant to variations in the angle of incidence. It has a simple structure and a relatively easy preparation process. These advantages make it suitable for applications in the fields of anti-radar stealth in the THz band.
{"title":"A numerical study of a multifunctional metamaterial with efficient terahertz absorption and low infrared emission","authors":"Jinjun Bai, Chunxi Liu, Ying Shi, Wei Xu, Shengjiang Chang","doi":"10.1088/2040-8986/ad6a6d","DOIUrl":"https://doi.org/10.1088/2040-8986/ad6a6d","url":null,"abstract":"In this study, a multifunctional metamaterial is proposed to effectively absorb terahertz (THz) radiation and shield against infrared (IR) emissions. The device comprises an IR shielding layer made of ZnS and SiO<sub>2</sub>, and a terahertz absorbing layer utilizing a ‘graphene—SiO<sub>2</sub>—gold’ sandwich-like structure. The properties of the metamaterial are investigated using the full-vector finite element method. The results indicate that the emissivity of the device is below 0.1 in the IR atmospheric window (8–14 <inline-formula>\u0000<tex-math><?CDATA $mu {text{m}}$?></tex-math><mml:math overflow=\"scroll\"><mml:mrow><mml:mi>μ</mml:mi><mml:mrow><mml:mtext>m</mml:mtext></mml:mrow></mml:mrow></mml:math><inline-graphic xlink:href=\"joptad6a6dieqn1.gif\"></inline-graphic></inline-formula>), with absorption reaching 90% and a bandwidth of 2.42 THz in 2–6 THz. Furthermore, the device is certainly tolerant to variations in the angle of incidence. It has a simple structure and a relatively easy preparation process. These advantages make it suitable for applications in the fields of anti-radar stealth in the THz band.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"30 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142181020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-08-11DOI: 10.1088/2040-8986/ad69a0
Zilin Jiang, Yixin Sun, Yifei Gao, Lilun Xu and Domna G Kotsifaki
Lipid vesicles are small biological particles that can be used for both targeted drug delivery systems and clinical studies. Their optical manipulation, however, is limited by the small difference in refractive indices with the surrounding medium, as well as the requirement for high laser trapping powers. In this work, we combine gradient force and thermal forces to deliver and trap individual lipid vesicles with low-trapping laser powers. The total optothermal force exerted on liposomes causes them to migrate rapidly toward the laser focus with a high average migration velocity of 1.77 µm s−1 under 7.3% w/v polyethylene glycol (PEG) concentration and low trapping laser power of 1 mW. A high normalized experimental trap stiffness of 0.88 (pN µm) mW−1 was obtained at 7.3% w/v PEG/water solution. This work may open new ways for bioparticle sorting and manipulation with potential applications in cellular studies, drug delivery, biosensing, and medicine.
{"title":"Fast lipid vesicles and dielectric particles migration using thermal-gradient-induced forces","authors":"Zilin Jiang, Yixin Sun, Yifei Gao, Lilun Xu and Domna G Kotsifaki","doi":"10.1088/2040-8986/ad69a0","DOIUrl":"https://doi.org/10.1088/2040-8986/ad69a0","url":null,"abstract":"Lipid vesicles are small biological particles that can be used for both targeted drug delivery systems and clinical studies. Their optical manipulation, however, is limited by the small difference in refractive indices with the surrounding medium, as well as the requirement for high laser trapping powers. In this work, we combine gradient force and thermal forces to deliver and trap individual lipid vesicles with low-trapping laser powers. The total optothermal force exerted on liposomes causes them to migrate rapidly toward the laser focus with a high average migration velocity of 1.77 µm s−1 under 7.3% w/v polyethylene glycol (PEG) concentration and low trapping laser power of 1 mW. A high normalized experimental trap stiffness of 0.88 (pN µm) mW−1 was obtained at 7.3% w/v PEG/water solution. This work may open new ways for bioparticle sorting and manipulation with potential applications in cellular studies, drug delivery, biosensing, and medicine.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"247 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141940308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-08-11DOI: 10.1088/2040-8986/ad6a26
S Vo, R Gutiérrez-Cuevas and M A Alonso
Spatiotemporal optical vortices (STOVs) are short pulses that present a vortex whose axis is perpendicular to the main propagation direction. We present analytic expressions for these pulses that satisfy exactly Maxwell’s equation, by applying appropriate differential operators to complex focus pulses with Poisson-like frequency spectrum. We also provide a simple ray picture for understanding the deformation of these pulses under propagation. Finally, we use these solutions to propose a type of pulse with sagittal skyrmionic polarization distribution covering all states of transverse polarization.
{"title":"Closed forms for spatiotemporal optical vortices and sagittal skyrmionic pulses","authors":"S Vo, R Gutiérrez-Cuevas and M A Alonso","doi":"10.1088/2040-8986/ad6a26","DOIUrl":"https://doi.org/10.1088/2040-8986/ad6a26","url":null,"abstract":"Spatiotemporal optical vortices (STOVs) are short pulses that present a vortex whose axis is perpendicular to the main propagation direction. We present analytic expressions for these pulses that satisfy exactly Maxwell’s equation, by applying appropriate differential operators to complex focus pulses with Poisson-like frequency spectrum. We also provide a simple ray picture for understanding the deformation of these pulses under propagation. Finally, we use these solutions to propose a type of pulse with sagittal skyrmionic polarization distribution covering all states of transverse polarization.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"96 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141940311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-08-07DOI: 10.1088/2040-8986/ad699d
Pasquale Falcone and Luigi Moretti
We numerically investigated the localization properties of band-gap and band-edge modes in a one-dimensional random Fibonacci optical multilayer. The statistics of the Lyapunov exponent (LE) reveal distinct behaviors of localization effects for band-edge and band-gap modes as function of disorder strength. In particular, a deviation from the single parameter scaling theory (SPST) of localization was observed within a frequency window corresponding to the band-gap of an ordered Fibonacci multilayer. Different band-gaps show different SPST dynamics. To provide a physical explanation for the violation of SPST, a close correlation between the frequency distribution of the resonant modes in the band-gap and the variance of the LE has been found. The spatial distribution of resonant modes has been reported and discussed. Finally, the dynamics of the gap closing of the two main band-gaps as function of the disorder strength has been analyzed.
我们对一维随机斐波那契光学多层中带隙和带边模式的局域化特性进行了数值研究。李雅普诺夫指数（LE）的统计结果表明，带边和带隙模式的局域化效应与无序强度的函数关系截然不同。特别是，在与有序斐波那契多层板带隙相对应的频率窗口内，观察到局部化偏离了单参数缩放理论（SPST）。不同的带隙显示出不同的 SPST 动态。为了对 SPST 的违反提供物理解释，我们发现带隙中共振模的频率分布与 LE 的方差之间存在密切的相关性。报告和讨论了共振模式的空间分布。最后，还分析了两个主要带隙的间隙关闭动态与无序强度的函数关系。
{"title":"Statistics of Lyapunov exponent in random Fibonacci multilayer","authors":"Pasquale Falcone and Luigi Moretti","doi":"10.1088/2040-8986/ad699d","DOIUrl":"https://doi.org/10.1088/2040-8986/ad699d","url":null,"abstract":"We numerically investigated the localization properties of band-gap and band-edge modes in a one-dimensional random Fibonacci optical multilayer. The statistics of the Lyapunov exponent (LE) reveal distinct behaviors of localization effects for band-edge and band-gap modes as function of disorder strength. In particular, a deviation from the single parameter scaling theory (SPST) of localization was observed within a frequency window corresponding to the band-gap of an ordered Fibonacci multilayer. Different band-gaps show different SPST dynamics. To provide a physical explanation for the violation of SPST, a close correlation between the frequency distribution of the resonant modes in the band-gap and the variance of the LE has been found. The spatial distribution of resonant modes has been reported and discussed. Finally, the dynamics of the gap closing of the two main band-gaps as function of the disorder strength has been analyzed.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"12 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141940310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-08-07DOI: 10.1088/2040-8986/ad5b74
Moses Simon and Prashant Chauhan
This communication deals with the analytical study of terahertz (THz) generation via frequency-difference mechanism using two circularly symmetric Gaussian laser beams with slightly different frequencies and and wave vectors and simultaneously propagating through a mixture of spatially corrugated noble-metal nanoparticles. The mixture, consisting of spherical nanoparticles (SNPs) and cylindrical nanoparticles (CNPs), is placed in a host medium under the influence of an externally applied static magnetic field. The two co-propagating laser beams impart a nonlinear ponderomotive force on the electrons of the NPs, causing them to experience nonlinear oscillatory velocity. Furthermore, the consequent nonlinear current density excites THz radiation at the beat frequency . Magnetic fields influence the surface plasmon resonance condition associated with electrons of the nanoparticles due to enhancement in ponderomotive nonlinearities, thereby causing an increment in the amplitude of the generated THz field. It is observed that the generated THz radiation has a strong dependence on the shape and size of the NPs in addition to the magnetic field strength. CNPSs provide greater THz amplitude than SNPs due to additional resonance modes, and combining both kinds of nanostructures further enhances the amplitude. THz radiation plays an important role in biomedical and pharmaceutical fields, communications, security and THz spectroscopy.
这篇论文涉及通过频差机制对太赫兹（THz）产生的分析研究，使用两束频率和波矢量略有不同的圆形对称高斯激光束，同时通过空间波纹贵金属纳米粒子混合物传播。该混合物由球形纳米粒子（SNPs）和圆柱形纳米粒子（CNPs）组成，置于外部静磁场影响下的主介质中。两束共同传播的激光对 NPs 的电子产生非线性思索动力，使其产生非线性振荡速度。此外，随之而来的非线性电流密度激发了拍频的太赫兹辐射。由于思索非线性的增强，磁场会影响与纳米粒子电子相关的表面等离子体共振条件，从而导致产生的太赫兹场振幅增大。据观察，除磁场强度外，所产生的太赫兹辐射还与纳米粒子的形状和尺寸密切相关。与 SNP 相比，CNPS 因具有额外的共振模式而可提供更大的太赫兹振幅，而将这两种纳米结构结合在一起可进一步增强振幅。太赫兹辐射在生物医学和制药、通信、安全和太赫兹光谱学领域发挥着重要作用。
{"title":"Magnetic field enhanced terahertz generation from shape-dependent metallic nanoparticles","authors":"Moses Simon and Prashant Chauhan","doi":"10.1088/2040-8986/ad5b74","DOIUrl":"https://doi.org/10.1088/2040-8986/ad5b74","url":null,"abstract":"This communication deals with the analytical study of terahertz (THz) generation via frequency-difference mechanism using two circularly symmetric Gaussian laser beams with slightly different frequencies and and wave vectors and simultaneously propagating through a mixture of spatially corrugated noble-metal nanoparticles. The mixture, consisting of spherical nanoparticles (SNPs) and cylindrical nanoparticles (CNPs), is placed in a host medium under the influence of an externally applied static magnetic field. The two co-propagating laser beams impart a nonlinear ponderomotive force on the electrons of the NPs, causing them to experience nonlinear oscillatory velocity. Furthermore, the consequent nonlinear current density excites THz radiation at the beat frequency . Magnetic fields influence the surface plasmon resonance condition associated with electrons of the nanoparticles due to enhancement in ponderomotive nonlinearities, thereby causing an increment in the amplitude of the generated THz field. It is observed that the generated THz radiation has a strong dependence on the shape and size of the NPs in addition to the magnetic field strength. CNPSs provide greater THz amplitude than SNPs due to additional resonance modes, and combining both kinds of nanostructures further enhances the amplitude. THz radiation plays an important role in biomedical and pharmaceutical fields, communications, security and THz spectroscopy.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"141 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141969165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-08-07DOI: 10.1088/2040-8986/ad699f
Chenlu Li, Minyang Zhang, Pengxiang Ruan, Changlan Xu, Youyou Hu, Mingming Zhang, Qingli Jing, Dongxu Chen and Jun Liu
We focus on the transmission characteristics of Ince-Gaussian (IG) beams in oceanic turbulence which is simulated by the random phase screen method. The transmission characteristics of IG beams with different distances and turbulence intensities are also shown in the experiments. The impacts of the temperature and salinity in oceanic turbulence are discussed in detail. The experimental results show that the IG beam maintains the intensity distribution well after transmission. In addition, compared with the others’ structured beams, the IG beams show better robustness in oceanic turbulence with different salinity, turbulence intensity and suspended solids. Our work paves the way for leveraging IG beams in underwater optical communication.
{"title":"Investigation of the transmission characters of Ince-Gaussian beams in oceanic turbulence","authors":"Chenlu Li, Minyang Zhang, Pengxiang Ruan, Changlan Xu, Youyou Hu, Mingming Zhang, Qingli Jing, Dongxu Chen and Jun Liu","doi":"10.1088/2040-8986/ad699f","DOIUrl":"https://doi.org/10.1088/2040-8986/ad699f","url":null,"abstract":"We focus on the transmission characteristics of Ince-Gaussian (IG) beams in oceanic turbulence which is simulated by the random phase screen method. The transmission characteristics of IG beams with different distances and turbulence intensities are also shown in the experiments. The impacts of the temperature and salinity in oceanic turbulence are discussed in detail. The experimental results show that the IG beam maintains the intensity distribution well after transmission. In addition, compared with the others’ structured beams, the IG beams show better robustness in oceanic turbulence with different salinity, turbulence intensity and suspended solids. Our work paves the way for leveraging IG beams in underwater optical communication.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"4 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141940309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-08-06DOI: 10.1088/2040-8986/ad699e
Tianyue Li, Mengjiao Liu, Chen Chen, Xingyi Li, Jiahao Hou, Xing Yang, Shuming Wang and Shining Zhu
Topologically protected skyrmion textures of light have garnered significant attention due to their potential applications in next-generation high-density data storage and logic devices. However, achieving compact and tunable on-chip skyrmion modes remains a formidable challenge. In this work, we present a novel approach empowered by birefringent metasurfaces to generate and manipulate spin-multiplexed photonic skyrmion textures. By encoding independent phase profiles onto orthogonal spin states, we observe the emergence of anti-skyrmions and skyrmioniums via Stokes parameter measurements, elucidating their distinct topological characteristics. This spin-multiplexed metasurface platform not only facilitates high-dimensional multiplexing but also enables the miniaturization of topological quasi-particles, offering promising prospects for applications in optical memory, information processing, and communications.
{"title":"Realization of spinful metaphotonic stokes skyrmions","authors":"Tianyue Li, Mengjiao Liu, Chen Chen, Xingyi Li, Jiahao Hou, Xing Yang, Shuming Wang and Shining Zhu","doi":"10.1088/2040-8986/ad699e","DOIUrl":"https://doi.org/10.1088/2040-8986/ad699e","url":null,"abstract":"Topologically protected skyrmion textures of light have garnered significant attention due to their potential applications in next-generation high-density data storage and logic devices. However, achieving compact and tunable on-chip skyrmion modes remains a formidable challenge. In this work, we present a novel approach empowered by birefringent metasurfaces to generate and manipulate spin-multiplexed photonic skyrmion textures. By encoding independent phase profiles onto orthogonal spin states, we observe the emergence of anti-skyrmions and skyrmioniums via Stokes parameter measurements, elucidating their distinct topological characteristics. This spin-multiplexed metasurface platform not only facilitates high-dimensional multiplexing but also enables the miniaturization of topological quasi-particles, offering promising prospects for applications in optical memory, information processing, and communications.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"58 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141969166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-07-31DOI: 10.1088/2040-8986/ad44ad
Yingying Wan, Tao Tang, Jinlong Li, Kai Yang, Yu Zhang, Jianping Peng
The nonlinearity effect in the system of fringe projection profilometry can cause the non-sinusoidal deviation of the fringe patterns, inducing ripple-like phase errors and further affecting measurement accuracy. This paper presents an online nonlinearity elimination method based on slope intensity coding. Two sequences of sinusoidal phase-shifting fringe patterns with different frequencies, and one slope intensity pattern with one uniform intensity pattern are projected. The equations for the nonlinearity response are established using the defined mean and modulation parameters, the captured uniform intensity and two extracted background intensities. The nonlinearity response coefficients determined by solving the equations are used for pixel-wise nonlinearity correction on the captured images, which are employed for computing the wrapped phase, and further obtaining continuous phase by the multi-frequency phase unwrapping method. Experimental results demonstrate that the proposed method can eliminate the nonlinearity-induced phase error online by using fewer images and maintain the reliability of phase unwrapping in the measurement of isolated objects with complex surfaces.
{"title":"Online nonlinearity elimination for fringe projection profilometry using slope intensity coding","authors":"Yingying Wan, Tao Tang, Jinlong Li, Kai Yang, Yu Zhang, Jianping Peng","doi":"10.1088/2040-8986/ad44ad","DOIUrl":"https://doi.org/10.1088/2040-8986/ad44ad","url":null,"abstract":"The nonlinearity effect in the system of fringe projection profilometry can cause the non-sinusoidal deviation of the fringe patterns, inducing ripple-like phase errors and further affecting measurement accuracy. This paper presents an online nonlinearity elimination method based on slope intensity coding. Two sequences of sinusoidal phase-shifting fringe patterns with different frequencies, and one slope intensity pattern with one uniform intensity pattern are projected. The equations for the nonlinearity response are established using the defined mean and modulation parameters, the captured uniform intensity and two extracted background intensities. The nonlinearity response coefficients determined by solving the equations are used for pixel-wise nonlinearity correction on the captured images, which are employed for computing the wrapped phase, and further obtaining continuous phase by the multi-frequency phase unwrapping method. Experimental results demonstrate that the proposed method can eliminate the nonlinearity-induced phase error online by using fewer images and maintain the reliability of phase unwrapping in the measurement of isolated objects with complex surfaces.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"33 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141862805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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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