Optics Communications最新文献

{"title":"Moiré meta-device for reconfigurable orbital angular momentum beam generation","authors":"Kai He,&nbsp;Tigang Ning,&nbsp;Jing Li,&nbsp;Li Pei,&nbsp;Zhouyi Hu,&nbsp;Jingjing Zheng,&nbsp;Bing Bai","doi":"10.1016/j.optcom.2025.131781","DOIUrl":"10.1016/j.optcom.2025.131781","url":null,"abstract":"<div><div>Moiré effect-based metasurfaces consist of two complementary all-dielectric metasurfaces and such Moiré meta-devices are promising for multi-parameter tuning of orbital angular momentum (OAM) beams. Herein, a general sector-separation phase modulation scheme for the Moiré meta-device is proposed to realize reconfigurable OAM beam generation. In this configuration, scalar OAM beam generation and vector OAM beam generation in space are implemented. The transmitted OAM beams allow dynamic and independent adjustment for left-handed circularly polarized (LCP) and right-handed circularly polarized (RCP) incident light. With a simple mutual rotation of the cascaded metasurfaces, both the topological charges of scalar OAM beams and the vector polarization states of vector OAM beams can be dynamically adjusted. The proposed design method of the Moiré meta-device platform provides an effective strategy for flexibly manipulating the properties of OAM beams, suggesting a novel approach for adaptive optical tweezers, structured illumination, and free-space optical communications.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131781"},"PeriodicalIF":2.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682146","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":"Investigation of h–shaped pulses in an ultra-long cavity erbium-doped fiber laser","authors":"Ningning Song,&nbsp;Rui Wang,&nbsp;Jun Zhang,&nbsp;Yichang Meng,&nbsp;Xinzheng Li,&nbsp;Huiyun Han,&nbsp;Yanhai Wang,&nbsp;Xingtao An","doi":"10.1016/j.optcom.2025.131782","DOIUrl":"10.1016/j.optcom.2025.131782","url":null,"abstract":"<div><div>We report the experimental observation of h-shaped pulses in a 10.1 km nonlinear polarization rotation (NPR) mode-locked erbium-doped fiber laser. The findings demonstrate that the h-shaped pulses are composed of two components: short-wavelength noise-like pulses and redshifted pulses, the latter of which are generated through the mechanism of intra-pulse Raman frequency shift. Additionally, the wavelength tunability and the harmonic mode-locking (HML) operation of the h-shaped pulse are investigated for the first time in an ultra-long NPR mode-locked erbium-doped fiber laser. These findings contribute to a more in-depth understanding of the complex pulses in fiber lasers.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131782"},"PeriodicalIF":2.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682160","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":"Investigation of hybrid electron extraction architecture via integration of mono-shelled carbon nanotubes (MS-CNT) with perovskite oxide BaSnO3 for beyond 38% efficiency in BaZrSe3 photovoltaic cells","authors":"Smriti Baruah,&nbsp;Janmoni Borah,&nbsp;K. Keerthi,&nbsp;P.A. Banu,&nbsp;P. Anitha,&nbsp;S. Rajasekaran","doi":"10.1016/j.optcom.2025.131769","DOIUrl":"10.1016/j.optcom.2025.131769","url":null,"abstract":"<div><div>This research centers on the numerical modeling and simulation of a photovoltaic cell, using the potential lead-free chalcogenide material, Barium Zirconium Selenide (BaZrSe₃), as the light-harvesting layer. The design integrates mono-shelled carbon nanotube (MS-CNT) with the wide-bandgap perovskite oxide semiconductor Barium Stannate (BaSnO₃) to form an innovative hybrid electron extraction composite layer (EECL), aiming to enhance the performance of the photovoltaic cell. A systematic investigation was conducted employing eight distinct hole extraction layers (HEL) to achieve optimal efficiency in conjunction with the BaSnO₃ electron extraction layer (EEL). This study conducted a comprehensive investigation into device physics, incorporating various optimization strategies to address critical parameters such as layer thickness, bandgap, defect density (both interfacial and bulk), and dopant concentration. Furthermore, the analysis extended to evaluating the effects of temperature, auxiliary resistances (series and shunt), capacitance, conductance, and the Mott-Schottky contact behavior within the proposed model. Our study demonstrates that the proposed FTO/BaSnO₃/MS-CNT/BaZrSe₃/FeS₂ chalcogenide photovoltaic cell (CPC) configuration, integrating mono-shelled carbon nanotubes (MS-CNTs) with the BaSnO₃ electron extraction layer (EEL) and Iron pyrite (FeS₂) as the hole extraction layer, achieves exceptional photovoltaic performance, attaining an optoelectronic conversion efficiency (OECE) of approximately 39.28 % and a short-circuit current density <em>J</em>_sc of 38.96 mA/cm². This performance closely approaches the theoretical Shockley–Queisser limit, highlighting the promising potential of the design. It has been evidenced that mono-shelled carbon nanotubes (MS-CNTs) with a bandgap of 1.1 eV achieve optimal band alignment, promoting efficient charge carrier extraction and contributing to a significant open-circuit voltage (<em>V</em>_oc) of 1.03 V. This work aims to stimulate further experimental investigations, providing essential insights to propel the advancement of chalcogenide photovoltaic cell technology.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131769"},"PeriodicalIF":2.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697779","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":"Multi-function integrated optic chip for miniaturized resonant fiber optic gyroscope","authors":"Heliang Shen,&nbsp;Lei Zhang,&nbsp;Minghan Li,&nbsp;Fei Huang,&nbsp;Xuan She,&nbsp;Kan Chen,&nbsp;Ran Bi,&nbsp;Lei Wang,&nbsp;Xiaowu Shu","doi":"10.1016/j.optcom.2025.131774","DOIUrl":"10.1016/j.optcom.2025.131774","url":null,"abstract":"<div><div>Due to the increasing demand for gyroscopes with reduced size, weight, cost, and power consumption (SWaP-C), integrated resonant fiber optic gyroscopes (RFOGs) have gained significant attention for their huge miniaturization potential. This paper presents a multi-function integrated optic chip (MFIOC) for RFOGs, which realizes the integration of beam splitter, polarizer, phase modulators (PMs) and intensity modulators (IMs). The MFIOC based on the annealed proton exchange lithium niobate platform offers powerful polarization filtering capability and low SWaP-C. The independent PM design effectively improves the bias instability and reduce the standard deviation of the gyro output by 23.41 dB. While optimizing the parameters of corresponding IMs reduces intensity feedback noise by 7 dB. This novel RFOG scheme with MFIOC paves the way for further research into high-precision, miniaturized, and integrated RFOGs.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131774"},"PeriodicalIF":2.2,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682155","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":"Active control of polarization state in terahertz metalens","authors":"Hongchuan He ,&nbsp;Yiqian Zhang ,&nbsp;Yangkai Wang ,&nbsp;Hao Cheng ,&nbsp;Zheng Liu ,&nbsp;Guangbin Dai ,&nbsp;Chengyue Wang ,&nbsp;Qiuping Huang ,&nbsp;Yalin Lu","doi":"10.1016/j.optcom.2025.131775","DOIUrl":"10.1016/j.optcom.2025.131775","url":null,"abstract":"<div><div>Metalens shows unprecendented capability in manipulating the propagation of electromagnetic wave, and has much more potential in light focusing, imaging, etc. than the conventional bulky lens. However, since the light refraction of metalens is caused by the phase discontinuity over the spatial phase responses, numerous efforts should be devoted into the design of every metastructure to meet the phase demand, which makes it challenging to achieve tunable metalenses. Here, we propose several terahertz (THz) metalenses with polarization states continuously tunable at their focal points as the external optical pump varies. Every metastructure of these metalenses contains two hybrid circular split ring resonators (CSRRs) composed of Si and Au, respectively. It is shown that the electromagnetic response of the hybrid CSRRs can be split into two orthogonal Pancharatnam-Berry phase modes, which are controlled by the rotation angles of Si and Au-CSRRs. Under this theory, THz metalenses with single or multiple reconfigurable linear polarized (LP) focal points are designed and simulated. By varying the Si conductivity, the polarization angle of LP THz wave at the focal point can continuously rotate from the initial angle to the designed one. Our design of metalens paves a new way for tunable metasurfaces.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131775"},"PeriodicalIF":2.2,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682144","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":"Proposing an ultra-low loss sodium-based triangular hybrid plasmonic waveguide","authors":"Hamed Firouzbakht,&nbsp;Amir Saman Nooramin","doi":"10.1016/j.optcom.2025.131777","DOIUrl":"10.1016/j.optcom.2025.131777","url":null,"abstract":"<div><div>Highly confined and long-range deep subwavelength optical propagation is crucial for photonic integration. Surface plasmon polaritons provide a scientific method for high-density photonic integration and low-loss optical field transmission. In this research, we introduce a triangular hybrid plasmonic waveguide in which a triangular nanowire is separated by a layer of <span><math><mrow><msub><mrow><mi>S</mi><mi>i</mi><mi>O</mi></mrow><mn>2</mn></msub></mrow></math></span> from a (<span><math><mrow><mi>N</mi><mi>a</mi></mrow></math></span>) substrate and fixed with columns of <span><math><mrow><msub><mrow><mi>S</mi><mi>i</mi><mi>O</mi></mrow><mn>2</mn></msub></mrow></math></span>. The properties of the propagation modes have been analyzed using the finite element method at the <span><math><mrow><mn>1550</mn><mi>n</mi><mi>m</mi></mrow></math></span> wavelength. The results show that we have normalized mode area = <span><math><mrow><mn>1.6</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>3</mn></mrow></msup></mrow></math></span>, effective index = <span><math><mrow><mn>1.1344</mn></mrow></math></span>, propagation length = <span><math><mrow><mn>660</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>, and figure of merit = <span><math><mrow><mn>5410</mn></mrow></math></span> simultaneously. Because of the field concentration at the tip of the triangle, a lower loss, higher confinement, and longer propagation length have been attained. In addition, the fabricating method of the proposed waveguide has been proposed and discussed. These findings of the triangular hybrid plasmonic waveguides make them widely used in many fields, including telecommunications, sensors, lasers, and optical technologies.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131777"},"PeriodicalIF":2.2,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697782","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":"Multi-tone meaningful visual cryptography scheme based on optical axis angle superposition","authors":"Guang-Hui Cui ,&nbsp;Bin Yan ,&nbsp;Jeng-Shyang Pan ,&nbsp;Hong-Mei Yang","doi":"10.1016/j.optcom.2025.131711","DOIUrl":"10.1016/j.optcom.2025.131711","url":null,"abstract":"<div><div>The visual cryptography scheme based on polarization uses the polarization state of light to encrypt images, ensuring that the share images have no pixel expansion and that the secret image can be reconstructed without loss of quality. However, its shares are meaningless noise images. To solve this problem, a multi-tone meaningful visual cryptography scheme based on optical axis angle superposition (OAAS-MVC) is proposed. In our scheme, both secret images and cover images are multi-tone images. In the encoding phase, the image’s pixel is converted into the optical axis angles of the retarder film component (RFC). By adjusting the angles of the <span><math><mi>n</mi></math></span> <span><math><mi>λ</mi></math></span>/2 RFCs to specific angles, they can represent the pixel of the cover image. The share images are generated as meaningful images with the appearance of cover images. In the decoding phase, the angles of the <span><math><mi>n</mi></math></span> <span><math><mi>λ</mi></math></span>/2 RFCs are superimposed to reconstruct the secret image. Compared to other classic meaningful visual cryptography schemes, our scheme significantly improves the quality of the shares and the reconstructed secret image. The experimental results demonstrated the effectiveness and security of the scheme.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131711"},"PeriodicalIF":2.2,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682151","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":"Indoor visible light fingerprint positioning based on dynamic weighted RSSI and LGSHHO-LSSVM","authors":"Lieping Zhang ,&nbsp;Yao Chen ,&nbsp;Xiaolin Gao ,&nbsp;Jiazhi Yang ,&nbsp;Cui Zhang","doi":"10.1016/j.optcom.2025.131778","DOIUrl":"10.1016/j.optcom.2025.131778","url":null,"abstract":"<div><div>To address the issues of poor stability and low positioning accuracy in traditional indoor visible light fingerprint positioning methods based on received signal strength indicator (RSSI), this paper proposes an indoor visible light positioning method based on dynamically weighted RSSI signals and an improved harris hawk optimization (HHO) algorithm for least squares support vector machine (LSSVM) (abbreviation DW + LGSHHO-LSSVM algorithm). First, a dynamic weighting algorithm is introduced to process the RSSI signals, considering both the geometric distance between the receiver and the light source as well as the signal fluctuation, dynamically adjusting the weights to reduce noise interference and enhance the positioning features of the signal. Second, the logistic chaotic map is employed to improve population diversity, and a golden sine strategy is used to enhance the search efficiency of the HHO algorithm, thereby improving the global search ability and convergence accuracy of the algorithm. Finally, the improved HHO algorithm is used to optimize the key parameters of the LSSVM model, establishing a high-accuracy indoor positioning prediction model. Experimental results show that, in a 3 m × 4 m × 3 m test environment, the average positioning error of the DW + LGSHHO-LSSVM algorithm is 4.7 cm, with errors mainly concentrated in the range of 0.05–0.1 m. Compared to the LSSVM, HHO-LSSVM, DW + HHO-LSSVM, LGSHHO-LSSVM and MPA-LSSVM algorithms, the positioning accuracy is improved by 53.92 %, 48.35 %, 27.69 %, 38.96 % and 51.55 %, respectively. These results demonstrate the significant advantages of the proposed method in terms of positioning accuracy and stability.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131778"},"PeriodicalIF":2.2,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724925","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":"Automating interferometric focal length measurement techniques with varifocal optics","authors":"Arjent Imeri ,&nbsp;Syed Azer Reza","doi":"10.1016/j.optcom.2025.131703","DOIUrl":"10.1016/j.optcom.2025.131703","url":null,"abstract":"<div><div>Characterizing the focal length of a sample lens is one of the most fundamental and ubiquitous of measurements in optical metrology. In this paper, we eliminate bulk mechanical motion of optical components in various popular interferometric shop testing methods for sample focal length measurement. While most existing interferometric focal length measurement techniques require precise positioning and repositioning of bulk optical components according to the sample lens focal length, we show that repeatable and reliable focal length measurements are possible without a need of bulk motion of optical elements. We demonstrate that elimination of bulk mechanical motion is achieved via the introduction of varifocal optics such as focus tunable optic lenses in measurement testbeds. This improves the repeatability and compactness of these methods. Interferometric techniques which we automate are ones that use a standard double frequency grating and a Ronchi ruling. Moreover, we also upgrade a traditional Twyman–Green (TG) interferometer to an actively tunable version which can characterize focal length without requiring bulk motion of optical components. The presented techniques are validated with results from carefully designed experiments.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131703"},"PeriodicalIF":2.2,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681627","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":"Polarization-dependent resonance tunneling effect with epsilon-near-zero ultra-thin layer","authors":"Yuliang Zhi ,&nbsp;Yangyang Dai ,&nbsp;Gang Lu ,&nbsp;Gaige Zheng","doi":"10.1016/j.optcom.2025.131739","DOIUrl":"10.1016/j.optcom.2025.131739","url":null,"abstract":"<div><div>We present a theoretical and computational study of resonant optical tunneling (ROT) through an epsilon-near-zero (ENZ) ultra-thin layer, highlighting its potential for designing highly efficient optical devices in the mid-infrared (mid-IR) regime. By leveraging the unique properties of ENZ materials, we demonstrate the realization of a band-pass filter (BPF) with selective transmission characteristics for both transverse electric (TE) and transverse magnetic (TM) polarizations. By optimizing the multilayer design and prism geometry, we demonstrate the realization of a highly efficient BPF with broadband transmission and out-of-band suppression. The ENZ layer enables strong coupling and interference effects, giving rise to asymmetric Fano line shapes in the transmission spectrum. Our analysis reveals that this mechanism achieves high efficiency and polarization sensitivity, making it suitable for mid-IR optical systems requiring compact, high-performance polarizers and filters. Such ENZ-based designs open avenues for advanced applications in sensing, spectroscopy, and infrared photonics.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"583 ","pages":"Article 131739"},"PeriodicalIF":2.2,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682156","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}