Pub Date : 2024-03-12DOI: 10.1088/2040-8986/ad2ca4
Gaurav Sharma, Lennart Jütte, Jigar Gopani, Jules Brehme, Axel Günther, Ralf Sindelar, Franz Renz, Bernhard Roth
Electrospun polymer fiber mats feature versatile applications in tissue engineering, drug delivery, water treatment and chemical processes. The orientation of fibers within these mats is a crucial factor that significantly influences their properties and performance. However, the analysis of fiber samples using scanning electron microscopy (SEM) has limitations such as time consumption, fixed assembly, and restricted field of vision. Therefore, a fast and reliable method for qualitative measurements of fiber orientation is required. Mueller matrix polarimetry, a well-established method for measuring orientation of chemical and biological species, was employed in this case. We investigated the effect of four important parameters of the electrospinning process, namely collector speed, applied voltage, needle-to-collector distance, and solution concentration, on fiber orientation using Mueller matrix polarimetry thus extending the range of parameters analyzed. Measurements were performed using two extreme values and a central optimized value for each fabrication parameter. Changes in matrix values were observed for each fabrication parameter, and their correlation with fiber orientation was analyzed based on the Lu-Chipman decomposition. The results were compared with SEM images, which served as the ground truth, and showed overall good agreement. In the future, the analysis of electrospun polymer fibers can be done by using Mueller matrix polarimetry as alternative to current technology and fabrication parameters, including solution concentration for the first time in this context and the production can quickly be adjusted based on the outcome of the measurements.
电纺聚合物纤维毡可广泛应用于组织工程、药物输送、水处理和化学工艺。纤维毡中纤维的取向是影响其特性和性能的关键因素。然而，使用扫描电子显微镜（SEM）分析纤维样品有其局限性，如耗时、固定装配和视野受限。因此，需要一种快速可靠的方法来定性测量纤维的取向。穆勒矩阵极坐标法是一种用于测量化学和生物物种取向的成熟方法。我们利用穆勒矩阵极坐标法研究了电纺过程中四个重要参数（即收集器速度、施加电压、针到收集器的距离和溶液浓度）对纤维取向的影响，从而扩大了分析参数的范围。每个制造参数都使用两个极端值和一个中心优化值进行测量。观察了每个制造参数的矩阵值变化，并根据 Lu-Chipman 分解法分析了它们与纤维取向的相关性。结果与作为基本事实的 SEM 图像进行了比较，总体上显示出良好的一致性。今后，电纺聚合物纤维的分析可采用穆勒基质极坐标法，以替代当前的技术和制造参数，包括在此背景下首次使用的溶液浓度，并可根据测量结果快速调整生产。
{"title":"Monitoring of multiple fabrication parameters of electrospun polymer fibers using mueller matrix analysis","authors":"Gaurav Sharma, Lennart Jütte, Jigar Gopani, Jules Brehme, Axel Günther, Ralf Sindelar, Franz Renz, Bernhard Roth","doi":"10.1088/2040-8986/ad2ca4","DOIUrl":"https://doi.org/10.1088/2040-8986/ad2ca4","url":null,"abstract":"Electrospun polymer fiber mats feature versatile applications in tissue engineering, drug delivery, water treatment and chemical processes. The orientation of fibers within these mats is a crucial factor that significantly influences their properties and performance. However, the analysis of fiber samples using scanning electron microscopy (SEM) has limitations such as time consumption, fixed assembly, and restricted field of vision. Therefore, a fast and reliable method for qualitative measurements of fiber orientation is required. Mueller matrix polarimetry, a well-established method for measuring orientation of chemical and biological species, was employed in this case. We investigated the effect of four important parameters of the electrospinning process, namely collector speed, applied voltage, needle-to-collector distance, and solution concentration, on fiber orientation using Mueller matrix polarimetry thus extending the range of parameters analyzed. Measurements were performed using two extreme values and a central optimized value for each fabrication parameter. Changes in matrix values were observed for each fabrication parameter, and their correlation with fiber orientation was analyzed based on the Lu-Chipman decomposition. The results were compared with SEM images, which served as the ground truth, and showed overall good agreement. In the future, the analysis of electrospun polymer fibers can be done by using Mueller matrix polarimetry as alternative to current technology and fabrication parameters, including solution concentration for the first time in this context and the production can quickly be adjusted based on the outcome of the measurements.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"187 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313647","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 : 2024-03-11DOI: 10.1088/2040-8986/ad2d37
B Tellez-Garcia, P Martinez-Vara, A Perez-Leija, J C Ramirez-San-Juan, I Julián-Macías, G Martinez-Niconoff
We analyze the evolution of the speckle pattern subjected to a compression showing that the spatial evolution of the probability density function satisfies a non-linear diffusion equation. Its asymptotic solution corresponds to a non-homogeneous wave with string-shape. During the compression, an irradiance interaction is generated between the speckles. The interaction satisfies a type-logistic equation. The electric field components associated with the speckles present a random behavior, however, during the compression process, the transversal components cancel each other, and the resulting light presents a state of polarization parallel to the propagation coordinate, justifying the non-homogeneous behavior. Computer simulations are presented.
{"title":"Asymptotic evolution of speckle patterns to synthesize non-homogeneous string beams","authors":"B Tellez-Garcia, P Martinez-Vara, A Perez-Leija, J C Ramirez-San-Juan, I Julián-Macías, G Martinez-Niconoff","doi":"10.1088/2040-8986/ad2d37","DOIUrl":"https://doi.org/10.1088/2040-8986/ad2d37","url":null,"abstract":"We analyze the evolution of the speckle pattern subjected to a compression showing that the spatial evolution of the probability density function satisfies a non-linear diffusion equation. Its asymptotic solution corresponds to a non-homogeneous wave with string-shape. During the compression, an irradiance interaction is generated between the speckles. The interaction satisfies a type-logistic equation. The electric field components associated with the speckles present a random behavior, however, during the compression process, the transversal components cancel each other, and the resulting light presents a state of polarization parallel to the propagation coordinate, justifying the non-homogeneous behavior. Computer simulations are presented.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"187 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313726","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 : 2024-03-11DOI: 10.1088/2040-8986/ad2a21
Ao Chen, WeiQiao Zhang, XuYan Zhou, Jing Liu, WanHua Zheng
The spatial coherence of filaments in edge-emitting broad-area semiconductor lasers (BALs) is studied based on speckle theory, and a passive speckle suppression method for BALs is demonstrated. A fly-eye lens is used to integrate the filaments and homogenize the laser beam. The speckle contrast is consistent with theoretical calculation, which proves the spatial incoherence of filaments. A light pipe is used to introduce an optical path difference between light with different incident angles, enabling more incoherent beamlets. These beamlets are then combined at different illuminating angles by a double-sided fly-eye lens and focusing lens. As a result, the subjective speckle contrast is reduced from 95.94% to 19.13% at 1.2 A while maintaining a high luminous efficiency of 77.8%. This work provides important design principles for laser display systems.
基于斑点理论研究了边缘发射宽域半导体激光器（BAL）中灯丝的空间相干性，并展示了一种用于 BAL 的被动斑点抑制方法。使用飞眼透镜整合灯丝并均匀激光束。斑点对比度与理论计算一致，证明了灯丝的空间不一致性。光导管用于在不同入射角的光线之间引入光路差，从而产生更多的不连贯小光束。然后，这些小光束通过双面飞眼透镜和聚焦透镜在不同的照明角度下进行组合。因此，在 1.2 A 时，主观斑点对比度从 95.94% 降至 19.13%，同时保持了 77.8% 的高光效。这项工作为激光显示系统提供了重要的设计原则。
{"title":"Spatial coherence research and passive speckle suppression for edge-emitting broad-area semiconductor lasers","authors":"Ao Chen, WeiQiao Zhang, XuYan Zhou, Jing Liu, WanHua Zheng","doi":"10.1088/2040-8986/ad2a21","DOIUrl":"https://doi.org/10.1088/2040-8986/ad2a21","url":null,"abstract":"The spatial coherence of filaments in edge-emitting broad-area semiconductor lasers (BALs) is studied based on speckle theory, and a passive speckle suppression method for BALs is demonstrated. A fly-eye lens is used to integrate the filaments and homogenize the laser beam. The speckle contrast is consistent with theoretical calculation, which proves the spatial incoherence of filaments. A light pipe is used to introduce an optical path difference between light with different incident angles, enabling more incoherent beamlets. These beamlets are then combined at different illuminating angles by a double-sided fly-eye lens and focusing lens. As a result, the subjective speckle contrast is reduced from 95.94% to 19.13% at 1.2 A while maintaining a high luminous efficiency of 77.8%. This work provides important design principles for laser display systems.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"194 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313940","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}
Some two-dimensional layered mono-elemental materials have been reported as saturable absorbers (SAs) for the generation of various soliton phenomena, and many excellent results have been achieved. In our experiment, we made thin films of germanene-polyvinyl alcohol (Ge-PVA) and applied them as SA in Er-doped fiber lasers, investigated Ge’s characteristics, and demonstrated the conversion from mode-locked to Q-switched mode-locked (QML). The conventional mode-locked operation with a repetition rate of 9.63 MHz and a central wavelength of 1559.7 nm was stably triggered when the pump power exceeded the threshold of 40 mW. QML pulse with a central wavelength of 1530.26 nm and the maximum pulse energy of 86 nJ can be obtained by changing the pump power and polarization state of the light in the cavity. This work reveals the excellent optical properties of Ge SA in ultrafast fiber lasers and provide a new approach for the generation of QML pulses.
一些二维层状单元素材料被报道用作产生各种孤子现象的可饱和吸收体（SA），并取得了许多出色的成果。在我们的实验中，我们制作了锗-聚乙烯醇（Ge-PVA）薄膜，并将其用作掺铒光纤激光器中的可饱和吸收体，研究了 Ge 的特性，并演示了从模式锁定到 Q 开关模式锁定（QML）的转换。当泵浦功率超过 40 mW 的阈值时，可稳定触发重复频率为 9.63 MHz、中心波长为 1559.7 nm 的传统锁模操作。通过改变泵浦功率和腔内光的偏振态，可获得中心波长为 1530.26 nm、最大脉冲能量为 86 nJ 的 QML 脉冲。这项工作揭示了 Ge SA 在超快光纤激光器中的优异光学特性，为产生 QML 脉冲提供了一种新方法。
{"title":"Germanene: demonstration of the conversion from mode-locked to Q-switched mode-locked in Er-doped fiber laser","authors":"Yunao Han, Weiyu Fan, Shuo Sun, Caixun Bai, Guomei Wang, Huanian Zhang, Wenfei Zhang, Chonghui Li, Shicai Xu, Shenggui Fu, Cheng Lu","doi":"10.1088/2040-8986/ad2ed8","DOIUrl":"https://doi.org/10.1088/2040-8986/ad2ed8","url":null,"abstract":"Some two-dimensional layered mono-elemental materials have been reported as saturable absorbers (SAs) for the generation of various soliton phenomena, and many excellent results have been achieved. In our experiment, we made thin films of germanene-polyvinyl alcohol (Ge-PVA) and applied them as SA in Er-doped fiber lasers, investigated Ge’s characteristics, and demonstrated the conversion from mode-locked to Q-switched mode-locked (QML). The conventional mode-locked operation with a repetition rate of 9.63 MHz and a central wavelength of 1559.7 nm was stably triggered when the pump power exceeded the threshold of 40 mW. QML pulse with a central wavelength of 1530.26 nm and the maximum pulse energy of 86 nJ can be obtained by changing the pump power and polarization state of the light in the cavity. This work reveals the excellent optical properties of Ge SA in ultrafast fiber lasers and provide a new approach for the generation of QML pulses.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"44 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313654","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 : 2024-03-08DOI: 10.1088/2040-8986/ad2a25
Xuefeng Qin, Jieying Jiang, Guiyuan Duan, Chongyang Xu, Xiangyang Zhang, Huaxin Zhu, Yang Huang, Nianxi Xu, Ben-Xin Wang
We design a bulk Dirac semimetal (BDS) metamaterial-based terahertz absorber consisted of a BDS layer, a dielectric layer and a gold grounding layer from top to bottom, which produces five excellent terahertz absorption peaks having 99.55%, 99.63%, 99.65%, 97.72%, and 99.87% absorption at 0.49 THz, 0.85 THz, 1.68 THz, 2.00 THz, and 2.27 THz, respectively. The five-band BDS-based absorber is polarization-insensitive and wide-angle tolerance, with good absorption in the incident angle range of 0°–60°. The tuning of the Fermi energy level of BDS in the range of 40–70 meV enables the dynamic adjustment of absorption frequencies and absorption rates of these peaks. We also analyze the refractive index sensing sensitivity of five-band BDS-based absorber, it is revealed that when the refractive index of surrounding analyte is changed from 1.0 to 1.8, the refractive indices of the five absorption peaks are 57.75 GHz/RIU, 107.25 GHz/RIU, 101.75 GHz/RIU, 101.75 GHz/RIU, and 134.75 GHz/RIU, which approximately exhibit an enhanced sensing sensitivity as the absorption frequency increases. The design is simultaneously characterized by multiple bands, high absorption, high stability,and high refractive index sensitivity, which should have great potential for application in the fields of terahertz technology.
{"title":"A five-band terahertz metamaterial absorber with properties of polarization-insensitive and wide-angle tolerance based on bulk Dirac semimetal","authors":"Xuefeng Qin, Jieying Jiang, Guiyuan Duan, Chongyang Xu, Xiangyang Zhang, Huaxin Zhu, Yang Huang, Nianxi Xu, Ben-Xin Wang","doi":"10.1088/2040-8986/ad2a25","DOIUrl":"https://doi.org/10.1088/2040-8986/ad2a25","url":null,"abstract":"We design a bulk Dirac semimetal (BDS) metamaterial-based terahertz absorber consisted of a BDS layer, a dielectric layer and a gold grounding layer from top to bottom, which produces five excellent terahertz absorption peaks having 99.55%, 99.63%, 99.65%, 97.72%, and 99.87% absorption at 0.49 THz, 0.85 THz, 1.68 THz, 2.00 THz, and 2.27 THz, respectively. The five-band BDS-based absorber is polarization-insensitive and wide-angle tolerance, with good absorption in the incident angle range of 0°–60°. The tuning of the Fermi energy level of BDS in the range of 40–70 meV enables the dynamic adjustment of absorption frequencies and absorption rates of these peaks. We also analyze the refractive index sensing sensitivity of five-band BDS-based absorber, it is revealed that when the refractive index of surrounding analyte is changed from 1.0 to 1.8, the refractive indices of the five absorption peaks are 57.75 GHz/RIU, 107.25 GHz/RIU, 101.75 GHz/RIU, 101.75 GHz/RIU, and 134.75 GHz/RIU, which approximately exhibit an enhanced sensing sensitivity as the absorption frequency increases. The design is simultaneously characterized by multiple bands, high absorption, high stability,and high refractive index sensitivity, which should have great potential for application in the fields of terahertz technology.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"25 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316891","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 : 2024-03-08DOI: 10.1088/2040-8986/ad2e20
Yu-Yen Tsai, Ting-Wei Chen
In this article. we investigate the optical characteristics of reflective extreme-ultraviolet (EUV) mirrors for the application of lithography for 7 nm node and below. By using the conventional quarter-wavelength stacked Bragg reflective configuration of Si-based metal multilayers centered at soft x-ray 13.5 nm, the maximum reflection is numerically computed to be approximately 0.7 at nearly normal incidence, which is consistent to the typical values reported by Advanced Semiconductor Materials Lithography (ASML) for Mo/Si stacked multilayers. The full width half maximum (FWHM) bandwidth is 0.65∼0.78 nm. In our numerical simulation, moreover, we find Nb/Si reflective mirrors can be potentially utilized to replace Mo/Si stacked multilayers in order to harvest more EUV light inside the scanners.
{"title":"Optical design of reflective Bragg mirrors for EUV photolithography","authors":"Yu-Yen Tsai, Ting-Wei Chen","doi":"10.1088/2040-8986/ad2e20","DOIUrl":"https://doi.org/10.1088/2040-8986/ad2e20","url":null,"abstract":"In this article. we investigate the optical characteristics of reflective extreme-ultraviolet (EUV) mirrors for the application of lithography for 7 nm node and below. By using the conventional quarter-wavelength stacked Bragg reflective configuration of Si-based metal multilayers centered at soft x-ray 13.5 nm, the maximum reflection is numerically computed to be approximately 0.7 at nearly normal incidence, which is consistent to the typical values reported by Advanced Semiconductor Materials Lithography (ASML) for Mo/Si stacked multilayers. The full width half maximum (FWHM) bandwidth is <inline-formula>\u0000<tex-math><?CDATA $0.65sim0.78$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mn>0.65</mml:mn><mml:mo>∼</mml:mo><mml:mn>0.78</mml:mn></mml:math>\u0000<inline-graphic xlink:href=\"joptad2e20ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> nm. In our numerical simulation, moreover, we find Nb/Si reflective mirrors can be potentially utilized to replace Mo/Si stacked multilayers in order to harvest more EUV light inside the scanners.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"44 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313655","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 : 2024-03-06DOI: 10.1088/2040-8986/ad2ca6
Soumen Mandal, Akash Das, Manik Pradhan
We report on an experimental investigation of the Goos–Hänchen (GH) optical beam shift in the vicinity of the critical angle of incidence at an air–glass interface using a weak value amplification (WVA) technique for two mutually orthogonal first order Hermite–Gaussian (HG) modes (HG10 and HG01) of a light beam at 633 nm generated by a phase-only reflective spatial light modulator. We have developed a mathematical approach to visualize the beam shaping due to the WVA scheme of beam shifts for the HG modes. The study reveals the angle of incidence dependency of the GH shift in the total internal reflection condition. For both modes, a detailed study of the horizontal and transverse beam shift values with varied post-selection angles is also reported. In addition, a comparison of the beam shift values for both of the selected modes with the fundamental mode (HG00) has been demonstrated. We found a significant enhancement (about two to three times) in the beam shifts for the first order HG10 and HG01 modes compared to the fundamental mode (HG00). Our results clearly demonstrate the advantages of the HG modes of the light beam-exploiting WVA technique and thus may contribute significantly to this field and open up important applications in photonic manipulation and future technologies.
{"title":"Weak measurement of the Goos–Hänchen shift for a Hermite–Gaussian laser beam","authors":"Soumen Mandal, Akash Das, Manik Pradhan","doi":"10.1088/2040-8986/ad2ca6","DOIUrl":"https://doi.org/10.1088/2040-8986/ad2ca6","url":null,"abstract":"We report on an experimental investigation of the Goos–Hänchen (GH) optical beam shift in the vicinity of the critical angle of incidence at an air–glass interface using a weak value amplification (WVA) technique for two mutually orthogonal first order Hermite–Gaussian (HG) modes (HG<sub>10</sub> and HG<sub>01</sub>) of a light beam at 633 nm generated by a phase-only reflective spatial light modulator. We have developed a mathematical approach to visualize the beam shaping due to the WVA scheme of beam shifts for the HG modes. The study reveals the angle of incidence dependency of the GH shift in the total internal reflection condition. For both modes, a detailed study of the horizontal and transverse beam shift values with varied post-selection angles is also reported. In addition, a comparison of the beam shift values for both of the selected modes with the fundamental mode (HG<sub>00</sub>) has been demonstrated. We found a significant enhancement (about two to three times) in the beam shifts for the first order HG<sub>10</sub> and HG<sub>01</sub> modes compared to the fundamental mode (HG<sub>00</sub>). Our results clearly demonstrate the advantages of the HG modes of the light beam-exploiting WVA technique and thus may contribute significantly to this field and open up important applications in photonic manipulation and future technologies.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"33 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313649","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}
Recently, gapless dislocation modes along the synthetic translation dimensions are proposed in two-dimensional photonic crystals. However, gapless dislocation modes are specific to either transverse magnetic or transverse electric polarization, hindering their utility in polarization-independent optics. In this work, we achieve polarization-independent dislocation modes in the crossing of gapless dislocation modes of two polarizations. The frequencies of TM and TE polarized dislocation modes change with the translation parameter. By selecting suitable translation parameter, we realize TM and TE polarized dislocation modes at the same frequency within a single dislocation. We not only realize dual-polarization gapless dislocation modes but also investigate their eigen field characteristics with different frequencies. Our work offers a novel strategy for developing polarization-independent topological photonic devices.
最近，有人在二维光子晶体中提出了沿合成平移维度的无间隙位错模式。然而，无间隙位错模式只适用于横向磁偏振或横向电偏振，这阻碍了它们在偏振无关光学中的应用。在这项工作中，我们在两种极化的无间隙位错模式交叉中实现了与极化无关的位错模式。TM 和 TE 极化位错模式的频率随平移参数的变化而变化。通过选择合适的平移参数，我们在单个差排中实现了频率相同的 TM 和 TE 极化差排模式。我们不仅实现了双极化无间隙差排模式，还研究了它们在不同频率下的特征场特性。我们的工作为开发与极化无关的拓扑光子器件提供了一种新策略。
{"title":"Polarization-independent dislocation modes in photonic crystals","authors":"Wen-Jin Zhang, Hao-Chang Mo, Zi-Xuan Gao, Xiao-Dong Chen, Jian-Wen Dong","doi":"10.1088/2040-8986/ad2d35","DOIUrl":"https://doi.org/10.1088/2040-8986/ad2d35","url":null,"abstract":"Recently, gapless dislocation modes along the synthetic translation dimensions are proposed in two-dimensional photonic crystals. However, gapless dislocation modes are specific to either transverse magnetic or transverse electric polarization, hindering their utility in polarization-independent optics. In this work, we achieve polarization-independent dislocation modes in the crossing of gapless dislocation modes of two polarizations. The frequencies of TM and TE polarized dislocation modes change with the translation parameter. By selecting suitable translation parameter, we realize TM and TE polarized dislocation modes at the same frequency within a single dislocation. We not only realize dual-polarization gapless dislocation modes but also investigate their eigen field characteristics with different frequencies. Our work offers a novel strategy for developing polarization-independent topological photonic devices.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"87 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313734","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 : 2024-03-04DOI: 10.1088/2040-8986/ad2ca5
Jiahao Xiong, Xuan Zhang, Ai Fu, Hong-Chao Liu
Imaging a target scene with specular surfaces is a daunting challenge for both direct imaging and indirect computational imaging techniques. The intense specular reflection component during the measurement severely degrades the quality of the reconstructed image, resulting in a substantial loss of scene information. To address this issue, we propose a computational ghost imaging (CGI) method with adaptive intensity illumination. Capitalizing on the encoded imaging feature of CGI, this method enables effective imaging of target scenes with specular surfaces through two series of measurements, eliminating the necessity for additional optical components. Based on the position and intensity information of pixels in the specular regions from the first series of measurements, our method modulates the illumination patterns to weaken the intensity of the specular region in the second series of measurements. Simulation and experimental results demonstrate that the utilization of these modulated illumination patterns for target scene measurement effectively mitigates interference from the specular surface during imaging. Consequently, the reconstructed image is capable of presenting more detailed information about the target scene other than the specular regions. Our work introduces a novel approach for imaging target scenes with specular surfaces and broadens the scope of applications for CGI in reality.
{"title":"Computational ghost imaging with adaptive intensity illumination for scenes featuring specular surfaces","authors":"Jiahao Xiong, Xuan Zhang, Ai Fu, Hong-Chao Liu","doi":"10.1088/2040-8986/ad2ca5","DOIUrl":"https://doi.org/10.1088/2040-8986/ad2ca5","url":null,"abstract":"Imaging a target scene with specular surfaces is a daunting challenge for both direct imaging and indirect computational imaging techniques. The intense specular reflection component during the measurement severely degrades the quality of the reconstructed image, resulting in a substantial loss of scene information. To address this issue, we propose a computational ghost imaging (CGI) method with adaptive intensity illumination. Capitalizing on the encoded imaging feature of CGI, this method enables effective imaging of target scenes with specular surfaces through two series of measurements, eliminating the necessity for additional optical components. Based on the position and intensity information of pixels in the specular regions from the first series of measurements, our method modulates the illumination patterns to weaken the intensity of the specular region in the second series of measurements. Simulation and experimental results demonstrate that the utilization of these modulated illumination patterns for target scene measurement effectively mitigates interference from the specular surface during imaging. Consequently, the reconstructed image is capable of presenting more detailed information about the target scene other than the specular regions. Our work introduces a novel approach for imaging target scenes with specular surfaces and broadens the scope of applications for CGI in reality.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"186 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313639","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 : 2024-02-29DOI: 10.1088/2040-8986/ad2b03
Surabhi Yadav, Vijay Bhatt, Aranya B Bhattacherjee, Pradip K Jha
We theoretically investigate the optomechanical interaction between an optical field and a mechanical mode mediated by a Kerr nonlinear medium inside an optical cavity and simultaneously driven by an external amplitude-modulated pump field and a probe field. We show that switching between bistability and multistability is influenced by the rocking parameter and Kerr nonlinearity. Further, we study the quantum fluctuation dynamics of the system, which shows the quantum coherence and interference effects resulting in the transmission of the probe field from opacity to amplification. We also find that the rocking parameter, Kerr nonlinearity, and the optomechanical coupling influence the transmission spectrum. In addition, we also show that the rocking parameter significantly enhances the optomechanical coupling, which can be a new handle to control the entanglement between the optical and mechanical modes. The results show that such a hybrid optomechanical system has potential application in designing and optimizing all-optical switching and optical sensors.
{"title":"Optical response properties and bipartite entanglement in a hybrid optomechanical system assisted by Kerr-nonlinearity and amplitude modulated drive field","authors":"Surabhi Yadav, Vijay Bhatt, Aranya B Bhattacherjee, Pradip K Jha","doi":"10.1088/2040-8986/ad2b03","DOIUrl":"https://doi.org/10.1088/2040-8986/ad2b03","url":null,"abstract":"We theoretically investigate the optomechanical interaction between an optical field and a mechanical mode mediated by a Kerr nonlinear medium inside an optical cavity and simultaneously driven by an external amplitude-modulated pump field and a probe field. We show that switching between bistability and multistability is influenced by the rocking parameter and Kerr nonlinearity. Further, we study the quantum fluctuation dynamics of the system, which shows the quantum coherence and interference effects resulting in the transmission of the probe field from opacity to amplification. We also find that the rocking parameter, Kerr nonlinearity, and the optomechanical coupling influence the transmission spectrum. In addition, we also show that the rocking parameter significantly enhances the optomechanical coupling, which can be a new handle to control the entanglement between the optical and mechanical modes. The results show that such a hybrid optomechanical system has potential application in designing and optimizing all-optical switching and optical sensors.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"13 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313641","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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