Journal of Optics最新文献_第10页

SOI Based metasurface for broadband perfect reflection in visible spectrum 基于 SOI 的用于可见光谱宽带完美反射的元表面

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-02-29 DOI: 10.1088/2040-8986/ad2bab

Ankit1, Kamal Kishor, Ravindra Kumar Sinha

{"title":"SOI Based metasurface for broadband perfect reflection in visible spectrum","authors":"Ankit1, Kamal Kishor, Ravindra Kumar Sinha","doi":"10.1088/2040-8986/ad2bab","DOIUrl":"https://doi.org/10.1088/2040-8986/ad2bab","url":null,"abstract":"We propose modeling and design of a low-loss all-dielectric metasurface (DM), comprised of Silicon on Insulator (SiO2) substrate to demonstrate a perfect reflector in the visible spectrum. The proposed metasurface unit cell consists of V and W shapes arranged in a mirror image configuration, with nanometre-sized gaps (g) between them. A narrow peak with a nearly 100% reflectance and a broad perfect reflectance spectrum is observed within the visible region (400–700 nm) of the electromagnetic spectrum. The effective electromagnetic parameters were also analyzed for electric and magnetic dipole resonance. The electric and magnetic field distributions at the resonant wavelength were also analyzed for the proposed structure. By altering the gap region ‘g’, the thickness of the dielectric Silica layer (<italic toggle=\"yes\">ts\u0000</italic>), and the Si resonator (<italic toggle=\"yes\">t</italic>\u0000m), the proposed structure exhibits tunable characteristics. We have successfully illustrated the consistent position of the scattering parameter’s response, regardless of the structure’s rotation, concluding the homogeneity of the designed structure across the entire visible spectrum. The all-DM exhibits a unique combination of features, including a distinct and wide reflectance spectrum as well as a tuned and enhanced electric field which makes it an ideal platform for the applications in filters, color printing, low-loss slow-light devices, and nonlinear optics.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"33 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313965","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}

引用次数: 0

Effect of electron–phonon interactions on a three-level QD-based spaser: linear and quadratic potentials 电子-声子相互作用对基于三电平 QD 的溅射器的影响：线性和二次电势

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-02-27 DOI: 10.1088/2040-8986/ad29ac

Ankit Purohit, Vishvendra Singh Poonia, Akhilesh Kumar Mishra

{"title":"Effect of electron–phonon interactions on a three-level QD-based spaser: linear and quadratic potentials","authors":"Ankit Purohit, Vishvendra Singh Poonia, Akhilesh Kumar Mishra","doi":"10.1088/2040-8986/ad29ac","DOIUrl":"https://doi.org/10.1088/2040-8986/ad29ac","url":null,"abstract":"In this article, we study the effect of electron–phonon interaction on a spaser (surface plasmon amplification by stimulated emission of radiation) system consisting of a metal nanoparticle surrounded by a large number of quantum dots (QDs). Usually, the effect of electron–phonon interaction is neglected in the spaser-related literature. However, gain media, in this case QDs, attributed by the large Raman scattering cross-section, exhibit stronger electron–phonon interaction. In the present work, we investigate the effects of electron–phonon interaction on a three-level QD-based spaser. We consider two types of interaction potentials, linear and quadratic, and analyse their effects individually. First, we focus on the linear electron–phonon interaction that perturbs the electrons present in the excited state. This yields a periodic steady-state number of localized surface plasmons (LSPs). The accompanying analytic solution reveals that the population inversion of the gain medium depends on the linear potential strength (Frohlich constant) but does not affect the threshold of spaser considerably for the given numerical parameters. In addition to the LSP, phonons are generated during this process, the temporal dynamics of which are also presented here. Initially, the number of phonons exhibit decaying periodic oscillations, whose amplitude depends on the strength of the electron–phonon interaction. Under continuous pumping, at later times, the number of phonons reaches a steady-state value, which may find potential applications in the realization of continuous phonon nanolasers. Furthermore, the effect of the quadratic potential is investigated phenomenologically by increasing the excited-state decay rate. This results in numerous LSPs and an intense spaser spectrum.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"32 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140011427","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}

引用次数: 0

Optimizing the temporal and spatial resolutions and light throughput of Fresnel incoherent correlation holography in the framework of coded aperture imaging 在编码孔径成像框架内优化菲涅尔非相干全息技术的时空分辨率和光吞吐量

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-02-14 DOI: 10.1088/2040-8986/ad2620

Francis Gracy Arockiaraj, Agnes Pristy Ignatius Xavier, Shivasubramanian Gopinath, Aravind Simon John Francis Rajeswary, Saulius Juodkazis, Vijayakumar Anand

{"title":"Optimizing the temporal and spatial resolutions and light throughput of Fresnel incoherent correlation holography in the framework of coded aperture imaging","authors":"Francis Gracy Arockiaraj, Agnes Pristy Ignatius Xavier, Shivasubramanian Gopinath, Aravind Simon John Francis Rajeswary, Saulius Juodkazis, Vijayakumar Anand","doi":"10.1088/2040-8986/ad2620","DOIUrl":"https://doi.org/10.1088/2040-8986/ad2620","url":null,"abstract":"Fresnel incoherent correlation holography (FINCH) is a well-established digital holography technique for 3D imaging of objects illuminated by spatially incoherent light. FINCH has a higher lateral resolution of 1.5 times that of direct imaging systems with the same numerical aperture. However, the other imaging characteristics of FINCH, such as axial resolution, temporal resolution, light throughput, and signal-to-noise ratio (SNR), are lower than those of direct imaging systems. Different techniques were developed by researchers around the world to improve the imaging characteristics of FINCH while retaining the inherent higher lateral resolution of FINCH. However, most of the solutions developed to improve FINCH presented additional challenges. In this study, we optimized FINCH in the framework of coded aperture imaging. Two recently developed computational methods, such as transport of amplitude into phase based on the Gerchberg Saxton algorithm and Lucy–Richardson–Rosen algorithm, were applied to improve light throughput and image reconstruction, respectively. The above implementation improved the axial resolution, temporal resolution, and SNR of FINCH and moved them closer to those of direct imaging while retaining the high lateral resolution. A point spread function (PSF) engineering technique has been implemented to prevent the low lateral resolution problem associated with the PSF recorded using pinholes with a large diameter. We believe that the above developments are beyond the state-of-the-art of existing FINCH-scopes.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"68 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140002501","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}

引用次数: 0

Terahertz bi-functional polarization converter based on interference mechanism supported by diatomic metasurfaces 基于二原子元表面支持的干涉机制的太赫兹双功能偏振转换器

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-02-08 DOI: 10.1088/2040-8986/ad247c

Hui Li, Wenhui Xu, Hang Xu, Chunyu Song, Qi Tan, Jianquan Yao

{"title":"Terahertz bi-functional polarization converter based on interference mechanism supported by diatomic metasurfaces","authors":"Hui Li, Wenhui Xu, Hang Xu, Chunyu Song, Qi Tan, Jianquan Yao","doi":"10.1088/2040-8986/ad247c","DOIUrl":"https://doi.org/10.1088/2040-8986/ad247c","url":null,"abstract":"Polarization manipulation based on the Jones matrix facilitates the enhancement of light-matter interactions. Recently, arbitrarily tailorable polarization states generated with the assistance of a diatomic metasurface effectively reduce the complexity of the system. Nevertheless, a single polarization switching behavior hinders the application of meta-platforms in cryptographic imaging. Here, we theoretically propose and design a single-layer diatomic all-dielectric metasurface working in the terahertz band, which can efficiently realize bi-functional polarization switching according to the Jones matrix. Such a meta-platform is assembled from two anisotropic silicon pillars with carefully optimized lateral dimensions and in-plane twist angles. Benefiting from the flexible assembly of half-wave plate and quarter-wave plate, the polarization states generated by the constructed metasurfaces in the transmission mode can be arbitrarily tailored. The feasibility of this diatomic metasurface is further validated by a broadband near-field imaging device, paving the way for broader system applications in cryptographic imaging, data storage, and chiral sensing.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"27 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765100","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}

引用次数: 0

Fourier-transform-only method for random phase shifting interferometry 随机移相干涉测量的纯傅里叶变换方法

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-02-08 DOI: 10.1088/2040-8986/ad237c

Alperen Saltik, Sueda Saylan, Onur Tokel

{"title":"Fourier-transform-only method for random phase shifting interferometry","authors":"Alperen Saltik, Sueda Saylan, Onur Tokel","doi":"10.1088/2040-8986/ad237c","DOIUrl":"https://doi.org/10.1088/2040-8986/ad237c","url":null,"abstract":"An accurate and computationally simple phase shifting interferometry (PSI) method is developed to reconstruct phase maps without <italic toggle=\"yes\">a priori</italic> knowledge of the phase shift. Previous methods developed for random PSI either do not address general sources of error or require complex iterative processes and increased computational time. Here we demonstrate a novel method that is able to extract the phase using only Fourier transform (FT). With spatial FT analysis, randomly phase-shifted data is reordered to allow performing temporal FT on the intensity, which is a function of the phase shift. Since the entire process, including order analysis and phase calculation, is based only on Fourier analysis, it is rapid, easy to implement, and addresses general sources of error. The method exhibits high performance in experiments containing random phase shifts. Moreover, simulations incorporating common experimental error sources such as random intensity noise, intensity harmonics, and phase shift errors demonstrate that the proposed method performs as good as or better than the state-of-the-art phase reconstruction techniques in terms of accuracy and time.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"7 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765174","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}

引用次数: 0

A comparative study of coherent and incoherent drives in a four-level quantum dot–based spaser 基于四级量子点的激光器中相干和非相干驱动的比较研究

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-02-05 DOI: 10.1088/2040-8986/ad21dc

Ankit Purohit, Akhilesh Kumar Mishra

{"title":"A comparative study of coherent and incoherent drives in a four-level quantum dot–based spaser","authors":"Ankit Purohit, Akhilesh Kumar Mishra","doi":"10.1088/2040-8986/ad21dc","DOIUrl":"https://doi.org/10.1088/2040-8986/ad21dc","url":null,"abstract":"In this article, we theoretically investigate a spaser (surface plasmon amplification by stimulated emission of radiation) comprising a spherical silver nanoparticle surrounded by a four-level gain medium of quantum dots. The spaser system is pumped coherently and incoherently with the same excitation rate, and the characteristics of the resultant coherent localized surface plasmon (LSP) mode are compared for the two pumping scenarios. We provide a detailed analytical expression for the steady state and demonstrate that the incoherent pump is more suitable for the continuous spaser mode. The reason is better understood by studying the temporal evolution of the number of LSPs <inline-formula>\u0000<tex-math><?CDATA $left( {{N_n}} right)$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mfenced close=\")\" open=\"(\"><mml:mrow><mml:mrow><mml:msub><mml:mi>N</mml:mi><mml:mi>n</mml:mi></mml:msub></mml:mrow></mml:mrow></mml:mfenced></mml:math>\u0000<inline-graphic xlink:href=\"joptad21dcieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, where the LSP oscillation starts earlier for an incoherent drive and relaxes to a steady state with a large value of <inline-formula>\u0000<tex-math><?CDATA ${N_n}$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:msub><mml:mi>N</mml:mi><mml:mi>n</mml:mi></mml:msub></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"joptad21dcieqn2.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. At a large pump rate, the spaser curve shows saturation. In addition, we have found that the resonance peak of the spaser field is independent of coherent and incoherent pumping, whereas the peak amplitude of the field depends on the pump rate.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"20 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765178","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}

引用次数: 0

Feasibility analysis of modulation formats in different seawater types and practical implementation on underwater optical communication testbed 不同海水类型中调制格式的可行性分析以及在水下光通信试验平台上的实际应用

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-01-06 DOI: 10.1007/s12596-023-01494-2

Shreyas Jain, B. C. D. Devappa, Kalyani Pawar, A. V. Murthy

引用次数: 0

Flexible and transparent visible-infrared-compatible stealth film based on ITO/Ag/ITO configuration 基于 ITO/Ag/ITO 配置的柔性透明可见红外线兼容隐形薄膜

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-01-05 DOI: 10.1007/s12596-023-01585-0

Long Wang, Wenhao Wang, Liuying Wang, Gu Liu, C. Ge, Kejun Xu, Bin Wang, Tonghao Liu

引用次数: 0

Impact of propagation losses on photon-pair generation in silicon 传播损耗对硅中光子对生成的影响

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-01-04 DOI: 10.1088/2040-8986/ad1b11

Joyee Ghosh, Shivani Sharma, Vivek Venkataraman

{"title":"Impact of propagation losses on photon-pair generation in silicon","authors":"Joyee Ghosh, Shivani Sharma, Vivek Venkataraman","doi":"10.1088/2040-8986/ad1b11","DOIUrl":"https://doi.org/10.1088/2040-8986/ad1b11","url":null,"abstract":"\u0000 We present a semi-classical numerical model to estimate the impact of linear scattering loss and nonlinear absorption losses on the biphoton flux and their quantum correlations generated via spontaneous four-wave mixing in silicon nanowaveguides. The counter-intuitive observed enhancement of pair correlations with increasing loss is attributed to the dominant effect of reduced accidental counts from multiphoton generation, with a corresponding trade-off for the source brightness. Silicon nanowaveguides are shown to be capable of generating highly correlated paired photons with coincidental-to-accidental ratio (CAR) as high as ∽3400 and spectral brightness 2.8×105 pairs/s/GHz/mW, even in the presence of linear propagation loss of 1 dB/cm and nonlinear losses (two-photon absorption (TPA) and free-carrier absorption (FCA)), over a length of 1-cm with an input pump power of 1 mW. Loss and the corresponding Langevin noise are modeled using distributed beam splitters along the waveguide length to encapsulate the phenomenological coupling to the background reservoir (vacuum fluctuations). The proposed numerical model is more general compared to previous analytical models, particularly for including dispersion and wavelength-dependent losses, and more accurate for noise estimation in the high-photon-flux regime such as optical parametric amplifiers and squeezed state generation.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"59 12","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139386790","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}

引用次数: 0

A deep learning-based car accident detection approach in video-based traffic surveillance 基于深度学习的交通监控视频中的车祸检测方法

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-01-03 DOI: 10.1007/s12596-023-01581-4

Xinyu Wu, Tingting Li

引用次数: 0