Optics Communications最新文献

{"title":"Actively tunable multi-frequency narrowband terahertz absorber using graphene metamaterials","authors":"Zan Li ,&nbsp;Qianju Song ,&nbsp;Lianbao Jia ,&nbsp;Zao Yi ,&nbsp;Shubo Cheng ,&nbsp;Junqiao Wang ,&nbsp;Boxun Li","doi":"10.1016/j.optcom.2025.131768","DOIUrl":"10.1016/j.optcom.2025.131768","url":null,"abstract":"<div><div>This study presents a novel design for a multi-frequency narrowband terahertz absorber utilizing graphene metamaterials. Unlike other graphene-based terahertz absorbers, the proposed structure eliminates the need for graphene patterning, significantly simplifying the fabrication process and enhancing its feasibility for practical applications. The absorber consists of four layers: an Au substrate, a dielectric layer, a graphene layer, and a patterned Au absorption layer. The pattern of the metasurface absorption layer is composed of four rotationally symmetric rectangles and rings, which achieve high absorption performance while eliminating the need for graphene patterning. The simulation results indicate that when the terahertz wave strikes the absorber at a perpendicular angle and the graphene Fermi level is adjusted to 0.1 eV, the absorber achieves near-perfect absorption at five frequencies: 4.4362 THz, 6.4261 THz, 7.1191 THz, 9.1981 THz, and 9.604 THz, with a maximum absorption rate of 99.828 %. By determining the relative impedance of the absorber using the parameter inversion method through simulation, it is observed that the absorber follows the impedance matching theory. Moreover, through the study of the electric field distribution corresponding to the absorption peak, it is found that when the terahertz wave is incident on the absorber, a high absorption effect is produced due to the localized surface plasmon resonance (LSPR) between the Au layer and the graphene layer on the surface, LSPR technology has been widely utilized in applications such as sensors and absorbers. Furthermore, by adjusting the Fermi level of graphene and analyzing the absorption spectrum, it is demonstrated that the Fermi level enables active tunability of the absorber, highlighting its potential value in the field of terahertz smart devices.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131768"},"PeriodicalIF":2.2,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681613","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}

{"title":"Prediction of humidity levels for maximum optical relative transmittance using modified heterodyne detection and GA-BP neural networks","authors":"Xinlei Qian ,&nbsp;Ying Ji ,&nbsp;Xingxing Ge ,&nbsp;Yue Huang ,&nbsp;Chongpeng Huang ,&nbsp;Yong Kong","doi":"10.1016/j.optcom.2025.131773","DOIUrl":"10.1016/j.optcom.2025.131773","url":null,"abstract":"<div><div>Humidity management is of great significance for optimizing the performance of all-solid-state optical systems, while the intricate interplay between humidity and various optical elements’ relative transmittance (RT) is characterized by a nonlinear relationship, complicating the measurement and calculation of optimal humidity levels necessary for achieving maximum RT. In this paper, we present a modified heterodyne detection method to quantitatively measure RT variations across diverse optical materials under humidity fluctuations. The acquired data are trained into a unified mapping model using a genetic algorithm-back propagation (GA-BP) neural network, enabling precise prediction of humidity levels required for maximum RT. Experimental results demonstrate that the GA-BP method achieve a remarkable correlation coefficient (R²) of 0.998 between predicted and actual values, and with the proposed model, the predicted optimal humidity levels for polarizers, conductive films, and windows are 44 %, 21 %, and 15 %, respectively, yielding RT values exceeding 99 %. These results outperform scenarios without prediction or using traditional BP methods. We believe that this research can offer novel insights for optimizing related optical systems to enhance output quality.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131773"},"PeriodicalIF":2.2,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681625","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}

{"title":"Ultra-thin reflective terahertz-field projector using Vanadium dioxide Sierpinski metamaterial broadband absorber","authors":"B. Asrafali ,&nbsp;Fahim Khan ,&nbsp;Deepika Tyagi ,&nbsp;M.S. Syam ,&nbsp;M. Pavithra ,&nbsp;N. Yogesh ,&nbsp;Z. Ouyang","doi":"10.1016/j.optcom.2025.131770","DOIUrl":"10.1016/j.optcom.2025.131770","url":null,"abstract":"<div><div>Display and projector technologies are well-known in the optical domain but are largely unknown in the terahertz (THz) domain. This work demonstrates the ultrathin reflective THz-field projector using a Vanadium dioxide (VO₂) based Metamaterial (MTM) near-perfect absorber. The inclusion of the Sierpinski pattern in the MTM design creates dipole, quadrupole, and higher-order electromagnetic modes due to the greater number of resonating sharp edges that are intrinsically present in the design resulting in the broadband absorptance of 99.37 %. The absorptance for TE and TM polarization was calculated and the broadband exists from 0° to 70° of the incident angle. Utilizing this, an equivalent eight-segment THz reflective field projector is proposed. All the English alphabets and the Arabian numerics were displayed using the tuning property of VO₂, and the acronym ‘SZU’ was displayed to showcase the display effect without any disruption from the adjacent pixels. The proposed THz reflective field projector has the potential to serve the multidisciplinary domains of astrophysics, encrypted communication, THz holograms, and anti-counterfeiting measures.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131770"},"PeriodicalIF":2.2,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681629","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}

{"title":"Optical design of a double-sided telecentric zoom system with large field of view","authors":"Youping Huang,&nbsp;Xiaogang Chen,&nbsp;Hao Zhang,&nbsp;Xiaoyan Li","doi":"10.1016/j.optcom.2025.131765","DOIUrl":"10.1016/j.optcom.2025.131765","url":null,"abstract":"<div><div>Double-sided telecentric zoom system (DTZS), characterized by low distortion and high detection accuracy, holds significant promise for applications in machine vision and medical diagnosis. However, the DTZS faces two main drawbacks: one is the lack of a suitable initial structure, and the other is the insufficient field of view (FOV) in existing optical systems. In this paper, the design of large FOV DTZS is taken as an example, and a design method suitable for large FOV zoom system is presented. In this method, the initial structure of the DTZS can be divided into a front fixed-focus system and a rear zoom system, which can be transformed into a general zoom system for design, and then the system is further optimized using ZEMAX. The optimization results show that the DTZS possesses a magnification range from −0.458 × to −0.11 × and a FOV for detection from 24 mm to 100 mm, which can continuous detection of both small and large objects while meeting the precision requirements for diverse objects. The system exhibits excellent imaging quality which controls the telecentricity of both sides within 0.8°, the distortion is trolled within 0.11 %, and the MTF of each zoom configuration is above 0.34 (at 80 lp/mm) throughout the entire FOV. Additionally, the CAM curve of DTZS is smooth without inflexion, and the tolerance values are loose. The DTZS is characterized by a compact structure, large FOV, low distortion, excellent image quality, making it a promising candidate for applications in fields such as industrial automation detection, machine vision.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131765"},"PeriodicalIF":2.2,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681626","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}

{"title":"Optimized RbPbI3-Based perovskite solar cells with SnS2 ETL and MoO3 HTL achieving simulated PCE of 32.72%","authors":"Md. Ariful Islam Bhuiyan ,&nbsp;Md. Shamim Reza ,&nbsp;Avijit Ghosh ,&nbsp;Hmoud Al-Dmour ,&nbsp;Yedluri Anil Kumar ,&nbsp;Muhammad Ihsan Ibn Rahim ,&nbsp;Md. Aktarujjaman ,&nbsp;Fahima Yeasmin ,&nbsp;Hamad Al-Lohedan (.) ,&nbsp;R. Jothi Ramalingam ,&nbsp;Md. Selim Reza","doi":"10.1016/j.optcom.2025.131761","DOIUrl":"10.1016/j.optcom.2025.131761","url":null,"abstract":"<div><div>The pursuit of alternative absorber materials with higher structural and thermal stability has been fueled by the growing demand for high-efficiency and stable perovskite solar cells (PSCs). Using its improved durability and optoelectronic qualities, this work investigates RbPbI₃ as a possible substitute for conventional perovskites. Using SCAPS-1D to model an Ag/FTO/ETL/RbPbI₃/Ni device structure, a power conversion efficiency (PCE) of 28.12 % was first obtained with SnS₂ ETL (electron transport layer). Then, hole transport layer (HTL) concept has been used to improve the performances more. The thickness, defect density, and doping concentration of ETL and HTL, and absorber were all methodically optimized to improve performance. This led to a markedly improved V_OC of 1.22 V, PCE of 32.72 %, J_SC of 32.21 mA/cm², and FF of 83.27 % with MoO₃ HTL. The new results demonstrate that RbPbI₃ is a suitable substitute for long-term solar energy applications due to its improved stability, improved charge transport through SnS₂ and MoO₃, and decreased recombination losses. This research will have an impact on the development of high-performance, stable, and eco-friendly photovoltaic technologies in the future by directing the experimental validation and manufacture of RbPbI₃-based PSCs.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131761"},"PeriodicalIF":2.2,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644034","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}

{"title":"Pinching operators for approximating multiphoton entangled states","authors":"Skylar R. Turner ,&nbsp;Brian R. La Cour","doi":"10.1016/j.optcom.2025.131726","DOIUrl":"10.1016/j.optcom.2025.131726","url":null,"abstract":"<div><div>We introduce the pinching operator, which extends the theory of squeezing operators to non-Gaussian operators, and use it to approximate <span><math><mi>n</mi></math></span>-photon entangled states using a pinched vacuum state and pinching tensor of rank <span><math><mi>n</mi></math></span>. A simple recursion relation is derived for generating the Bogoliubov transformed creation and annihilation operators, which may be used to express the pinched state as a statistically equivalent set of nonlinearly transformed complex Gaussian random variables. Using this representation, we compare low-order approximations of the pinched state to entangled multiphoton Fock states, such as Greenberger–Horne–Zeilinger (GHZ) and W states. Using post-selection and a threshold detector model to represent non-Gaussian measurements, we find that this model is capable of producing states with a fidelity comparable to that of experimentally prepared multiphoton entangled states. Our results show that it is possible to classically simulate large multiphoton entangled states to high fidelity within the constraints of finite detection efficiency.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131726"},"PeriodicalIF":2.2,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Holographic multi-focus multifunctional metalens realises particle capture, rotation and sorting","authors":"Yuehua Deng ,&nbsp;Xiaoyan Huang ,&nbsp;Shengru Zhou ,&nbsp;Shaoqi Li ,&nbsp;Yijiao Zhu ,&nbsp;Yang Yu ,&nbsp;Junbo Yang","doi":"10.1016/j.optcom.2025.131718","DOIUrl":"10.1016/j.optcom.2025.131718","url":null,"abstract":"<div><div>Optical tweezers, with their excellent manipulation precision, have become a vital tool for exploring the microscopic world and have significantly advanced research in physical and biological sciences. However, enhancing system integration and multifunctionality remains a critical challenge. In this study, we adopt a shared aperture approach to design and construct a polarisation-insensitive multifunctional optical tweezer system with a high numerical aperture. This system can capture, rotate, and sort various nanospheres in parallel. Through theoretical analyses and numerical simulations, we propose an innovative method to coaxially focus a Gaussian spot with a vortex spot, generating a unique light field for conducting photodynamic analyses of particles. Furthermore, our method enables the generation of numerous arbitrary-state light fields in free space with uniformly normalised electric field strengths. These foci ensure uniform light field distribution and consistent particle capture, enhancing the precision of optical tweezers in biophysics, materials science, and nanotechnology. This work also provides novel theoretical insights for microscale precision manipulation and analysis.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131718"},"PeriodicalIF":2.2,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642268","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}

{"title":"Implementation of D-TURTLE with nanocrystals for the characterization of the polarization state of few-cycle laser pulses","authors":"Óscar Pérez-Benito,&nbsp;Rosa Weigand","doi":"10.1016/j.optcom.2025.131698","DOIUrl":"10.1016/j.optcom.2025.131698","url":null,"abstract":"<div><div>The D-TURTLE technique for the characterization of the polarization state of few-cycle pulses has been implemented using ensembles of randomly oriented nanocrystals as non-linear medium. Recording traces for four different field projections we were able to unambiguously determine the polarization state and handedness of few-cycle laser pulses. This approach can be especially interesting in spectral ranges where no bulk crystals are available.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131698"},"PeriodicalIF":2.2,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682158","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}

{"title":"Design, simulation, and comparison of optofluidics & sensing schemes for integrated optic biosensors","authors":"Chaitra Shri K,&nbsp;Malathi S","doi":"10.1016/j.optcom.2025.131742","DOIUrl":"10.1016/j.optcom.2025.131742","url":null,"abstract":"<div><div>Integrated Optic waveguide-based sensors are promising solutions for various applications, notably in the label-free detection of chemical and biological substances. For optimal sensitivity, the guided mode should interact with biomaterial. In this research article, we have considered Hollow-core waveguides and Strip waveguide-based biosensors. Hollow-core waveguides are analyzed as optofluidic devices in which bio-analytes form the core. Strip waveguide - Silicon on Insulator (SOI) has been considered for simulation purposes. Bulk sensing and Surface sensing scheme mechanisms were used to study the variations when bio analyte was encountered with waveguide material. In this article, we modelled, simulated, and analyzed two types of waveguides viz., Optofluidic channel with biomaterial as core, bulk sensing with biomaterial as clad covering the Silicon strip waveguide, and surface sensing with biomaterial covering the surface of the waveguide. Optofluidic channel with sensitivity in refractive index unit (RIU), the range of 2.4∗10 ⁻²/RIU to 2.8∗10 ⁻²/RIU; Bulk sensing sensitivity in the range of 2.5∗10 ⁻¹/RIU to 3.7∗10 ⁻¹/RIU; Surface sensing sensitivity in the range of 1.96∗10 ⁻²/RIU to 2.9∗10 ⁻³/RIU for different biomaterials. The main reason for selecting these ranges is that they represent practical and achievable values based on the physical interaction between light and biomaterials. These ranges also consider the technological constraints and the objectives of various biosensing applications. The novelty of the optofluidic scheme emanates from the ability to integrate fluidic and photonic elements to allow label-free detection due to the compact designs and high sensitivity. The optofluidic scheme offers advantages over bulk sensing (which relies on external cladding materials) and surface sensing (which only probes the interface) by providing volumetric sensing capabilities. We observed and analyzed results to derive design guidelines. Our findings assist in choosing an appropriate platform and optimizing sensitivity by the effective refractive index for the given bio application.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131742"},"PeriodicalIF":2.2,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681622","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}

{"title":"An online spectroscopy monitoring strategy for precisely constructing TiO2 nanocrystals during pulsed laser irradiation in liquids","authors":"Juntao Tan ,&nbsp;Jiatong Liu ,&nbsp;Bin Wang ,&nbsp;Pengke Yu ,&nbsp;Yang Li ,&nbsp;Shaofeng Zheng ,&nbsp;Jiaming Li ,&nbsp;Qingmao Zhang","doi":"10.1016/j.optcom.2025.131758","DOIUrl":"10.1016/j.optcom.2025.131758","url":null,"abstract":"<div><div>Precisely constructing TiO₂ nanocrystals poses significant challenges. In this work, online spectral analysis for TiO₂ nanocrystals under laser was proposed. In the complex spectral data, the wavelength dependence analysis was performed. Effective signals at 824 nm, 884 nm, 918 nm and 995 nm were extracted. 824 nm and 1100 nm revealed the size evolution; 884 nm, 918 nm, 995 nm, and 3300 cm⁻¹ revealed the nanocrystals evolution, intermediate grouping, and structural features. Additionally, preliminary particle size correlation of TiO₂ was described. This work demonstrates a valuable way for TiO₂ nanocrystals construction with the use of online spectral analysis.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131758"},"PeriodicalIF":2.2,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644591","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}