Optics Communications最新文献

{"title":"Spatiotemporal couplings in spectrally multiplexed optical parametric amplifications","authors":"Qiwen Zhen ,&nbsp;Xin Liu ,&nbsp;Jinhui Li ,&nbsp;Bobin Gao ,&nbsp;Yishan Wang ,&nbsp;Wei Zhao ,&nbsp;Nan Huang ,&nbsp;Huabao Cao ,&nbsp;Yuxi Fu","doi":"10.1016/j.optcom.2025.132450","DOIUrl":"10.1016/j.optcom.2025.132450","url":null,"abstract":"<div><div>Ultrashort laser pulses with high peak intensity and good spatiotemporal characteristic are essential for attosecond pulse generation, laser-plasma acceleration and other strong-field physics research. The spectrally multiplexed optical parametric amplification (OPA) is one of the key approaches to generate pulses with high peak intensity and ultrashort pulse duration. To investigate the spatiotemporal characteristic of these ultrashort intense pulses, we present a numerical simulation of spectrally multiplexed noncollinear optical parametric amplification (NOPA) system. The spatiotemporal couplings (STCs) are caused by the inhomogeneous signal gain in spatial domain. When longer crystal is employed to achieve higher gain level, the difference of optical parametric phase (OPP) at distinct beam positions increases, leading to stronger STCs. At the same gain level, STCs in spectrally multiplexed NOPA can be effectively suppressed by adopting flat-top pump profile, where the Strehl Ratio (SR) of amplified signal is higher than that using Gaussian pump profile.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132450"},"PeriodicalIF":2.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047369","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":"Super-resolution reconstruction of the holographically reconstructed image based on improved ESRGAN","authors":"Yuan Chen ,&nbsp;Sitian Li ,&nbsp;Hongwei Ma ,&nbsp;Peichao Li ,&nbsp;Guangming Zhang ,&nbsp;Jingjie Guo ,&nbsp;Ming Dong","doi":"10.1016/j.optcom.2025.132451","DOIUrl":"10.1016/j.optcom.2025.132451","url":null,"abstract":"<div><div>In digital holographic measurement, various noise sources, including dark current noise, readout noise, and photon shot noise from the CCD, can adversely affect the recording of interference fringes by introducing voltage fluctuations and degrading fringe contrast. Furthermore, optical system imperfections such as stray light, component defects and air turbulence lead to superposition and distortion of the fringe pattern, causing spatial deformation and temporal jitter. These combined effects ultimately compromise the resolution of the reconstructed holographic image. Therefore, in this paper, a super-resolution reconstruction method for the holographically reconstructed images based on improved ESRGAN is proposed, by optimizing the network structure and loss function, and introducing a noise reduction module to enhance the denoising ability and detail recovery performance of this method. Firstly, the DIV2K public dataset is converted into a digital holographically simulated dataset by means of the off-axis Fresnel holographic recording method. Then, the experimental dataset is constructed by reconstructing the holograms of the samples collected using the reflective off-axis optical path system based on Fresnel diffraction method. Finally, the constructed dataset is used for network training and testing, and the experimental results are compared and analyzed with those of the other four methods. The experimental results show that the proposed method outperforms the other methods in five metrics: PSNR, SSIM, RMSE, LPIPS and BRISQUE, especially in detail recovery and texture enhancement, and the reconstruction results are more in line with human visual perception characteristics. Therefore, the improved ESRGAN method proposed in this paper has significant advantages in the super-resolution reconstruction quality of the holographically reconstructed images, and provides a new technical approach for high-precision holographic imaging.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132451"},"PeriodicalIF":2.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047373","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":"Metasurface enhanced third harmonic generation and polarization-sensitive all-optical switch design based on BIC","authors":"Shuyuan Lv,&nbsp;Lan An,&nbsp;Wenfeng Luo,&nbsp;Lulu Zhang,&nbsp;Jue Liu","doi":"10.1016/j.optcom.2025.132453","DOIUrl":"10.1016/j.optcom.2025.132453","url":null,"abstract":"<div><div>To address the issues of low nonlinear efficiency, phase matching dependence, and large device volume in traditional third harmonic generation (THG) techniques, this study proposes a silicon-based double elliptical air nanoholes metasurface architecture for THG based on bound states in the continuum (BICs). By adjusting the rotation angle <em>θ</em> of the double elliptical air nanoholes to break the in-plane symmetry, the quasi-bound states in the continuum (q-BIC) is excited and the quality factor is dynamically tuned. When <em>θ</em> = 15°, the q-BIC excited by symmetry breaking forms a high-<em>Q</em> (4210) magnetic dipole resonance at 1349.1 nm. The local field enhancement effect simultaneously promotes efficient THG at 449.7 nm, with a conversion efficiency of 9.635 × 10⁻³. This dual-wavelength resonance mechanism stems from the strong field localization of the q-BIC and the synergistic effect of the third-order nonlinear polarization tensor <em>χ</em>⁽³⁾.When the pump light is <em>x</em>-polarized, the THG power is nearly 9 orders of magnitude higher than that of <em>y</em>-polarized light, verifying the polarization-sensitive nonlinear response characteristics. Based on this, a novel all-optical switch design scheme is proposed, which realizes the conversion of the signal light power between \"on\" and \"off\" states by switching the polarization state of the pump light.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132453"},"PeriodicalIF":2.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047501","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":"Quantum hydrodynamic theory modeling of spontaneous emission and energy level shift in plasmonic nanostructures: Impact of energy functional choices","authors":"Qihong Hu ,&nbsp;Runfeng Liu ,&nbsp;Xinyu Shan,&nbsp;Xiaoyun Wang,&nbsp;Hong Yang,&nbsp;Yonggang Huang","doi":"10.1016/j.optcom.2025.132403","DOIUrl":"10.1016/j.optcom.2025.132403","url":null,"abstract":"<div><div>We present a comprehensive optical analysis of spontaneous emission and energy level shifts of quantum emitters near sodium nanospheres using quantum hydrodynamic theory (QHT). Emphasizing near-field light–matter interactions, we investigate how different kinetic and exchange–correlation energy functionals influence the optical response within QHT. Our results show that a Laplacian-level kinetic energy functional, when combined with a local-density approximation, provides the most accurate and stable predictions for plasmonic nanostructures. To validate the robustness of this approach, we employ the Kramers–Kronig relation to calculate optical level shifts, demonstrating excellent numerical convergence. These findings underscore the importance of functional choice in accurately capturing nonclassical optical effects. Our study offers practical insights for quantum-corrected modeling in nanophotonics, enabling improved predictive capabilities in systems where nonlocal and quantum effects are critical.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132403"},"PeriodicalIF":2.5,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145027374","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":"Ultrafast carrier dynamics in topological insulator thin films under ultralow excitation conditions","authors":"Siyao Li ,&nbsp;Xianting Zhang ,&nbsp;Hsuan-Yin Chen ,&nbsp;Che-Wei Huang ,&nbsp;Jung-Chun-Andrew Huang ,&nbsp;Chao-Kuei Lee ,&nbsp;Hsiang-Chen Chui","doi":"10.1016/j.optcom.2025.132438","DOIUrl":"10.1016/j.optcom.2025.132438","url":null,"abstract":"<div><div>This study systematically investigates the nonlinear absorption properties and ultrafast carrier dynamics of bismuth antimonide (Bi₂Te₃) topological insulator thin films, revealing the spatiotemporal interplay between surface and bulk carriers. Using non-focused pump–probe ultrafast spectroscopy under sub-saturation excitation conditions, a distinctive bipolar transient reflectance signal is observed: an initial positive signal, attributed to the linear absorption of bulk conduction band carriers, is followed by a delayed negative component arising from the nonlinear absorption of surface states. These competing responses exhibit a dynamic delay of 5–15 ps. As the film thickness increases from 5 nm to 15 nm, the saturation absorption intensity increases from 17.62 kW/cm² to 24.48 kW/cm², while the polarity switching time decreases linearly. A dual-channel absorption model is proposed to describe the carrier transfer dynamics from bulk to surface states under low excitation regimes. Conducted under ultralow excitation fluences, this work underscores the critical role of dimensional control in shaping carrier relaxation pathways and offers new physical insights for designing topological insulator-based spintronic and low-power quantum computing devices.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132438"},"PeriodicalIF":2.5,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047500","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":"Tunable optical pins and optical channels","authors":"Weiting Wang ,&nbsp;Yujie Wu ,&nbsp;Zihan Liu ,&nbsp;Zhuoyue Sun ,&nbsp;Hongwei Gong ,&nbsp;Zijing Zhang ,&nbsp;Yixian Qian ,&nbsp;Dongmei Deng","doi":"10.1016/j.optcom.2025.132406","DOIUrl":"10.1016/j.optcom.2025.132406","url":null,"abstract":"<div><div>In this work, we introduce a novel class of circular Pearcey beams (NCPBs), for the first time to the best of our knowledge, to generate tunable optical pins (OPs) and optical channels (OCs). The NCPBs combine the advantages of self-accelerating and anti-diffracting beams, thereby overcoming the limitations of traditional circular Pearcey beams (CPBs), which are typically confined to focal-plane applications. The position, length, transverse dimensions, and intensity distribution of the OPs and OCs can be flexibly controlled by adjusting the amplitude modulation and spatial distribution factors. In addition, we have experimentally generated these beams and manipulated micron-sized particles using the OCs, verifying the correctness of the theoretical model and the feasibility of the methodology. Our work offers new possibilities for applications in fields such as particle transport, medical imaging and laser processing.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132406"},"PeriodicalIF":2.5,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047132","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":"Microwave photonic radar system for high-resolution and fast detection of small unmanned aerial vehicles based on photonics-assisted matched filter","authors":"Yukang Jia ,&nbsp;Ziqun Zhang ,&nbsp;Jichen Weng ,&nbsp;Jin Zhang ,&nbsp;Lei Zhang ,&nbsp;Junyi Du ,&nbsp;Hong Chen ,&nbsp;Xiaotong Liu ,&nbsp;Siyue Zeng ,&nbsp;Dongyu Li ,&nbsp;Fengbo Chen ,&nbsp;Anle Wang ,&nbsp;Hui Chen","doi":"10.1016/j.optcom.2025.132432","DOIUrl":"10.1016/j.optcom.2025.132432","url":null,"abstract":"<div><div>This paper presents a microwave photonic radar system based on a photon-assisted matched filter and verifies it through experiments. The system is centered on windowing and matched filtering techniques in the analog domain, combined with microwave photonic signal generation and down-conversion technology, thereby achieving rapid, high-resolution detection of small targets such as unmanned aerial vehicles (UAVs). In the transmit chain, optical frequency operation module is utilized to generate radar waveforms with the desired center frequency and bandwidth, as well as optical local oscillator (LO) signals required for optical domain down-conversion. In the receive chain, the broadband echo signal is down-converted in the optical domain using the optical LO provided by the transmit chain, followed by analog-domain broadband signal windowing and matched filtering. This reduces the computational load of windowing and matched filtering operations on broadband radar in the digital domain, enabling the system to effectively detect and resolve multiple UAVs of different sizes and obtain one-dimensional range profile of clustered targets. An experimental system was constructed to validate the proposed performance. Based on 1-GHz signal bandwidth at Ku band, precise detection of multiple corner reflectors demonstrates the system's high-resolution detection and 1D distance imaging capabilities. The resolution for two adjacent corner reflectors was approximately 20.1 cm. Effective detection of two UAVs with different sizes flying in close proximity (24.2 cm apart) showcases that photonics-assisted matched filter enhances the target detection capability of microwave photonic broadband radar systems. This work will contribute to the application of broadband high-resolution radar systems and provide a feasible method for the rapid detection of unmanned aerial vehicles or swarm targets.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132432"},"PeriodicalIF":2.5,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047497","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":"Electric field enhancement prediction in nano-structures with randomly incident light via Gaussian Peak fitting","authors":"Chong Yan ,&nbsp;Wei Yao ,&nbsp;Qing Wang ,&nbsp;Mingjie Wan ,&nbsp;Tao Li ,&nbsp;Luxiao Sang ,&nbsp;Yadong Zhou","doi":"10.1016/j.optcom.2025.132435","DOIUrl":"10.1016/j.optcom.2025.132435","url":null,"abstract":"<div><div>Gaussian peak fitting is a powerful tool in extracting meaningful information from data that can be approximated by Gaussian functions, particularly in analyzing data that exhibits a series of overlapping peaks. In the work, we propose a theoretical model to analyze the near- and far-field optical response of nanoparticle (NP) clusters, specifically dimer and trimer structures. Using the extinction spectra and electric field enhancement factor curves as examples, we demonstrate that the origin of peaks under randomly angled incident fields can be simply predicted by the peaks or coupling modes under normal incidence. The method holds the potential to correlate the structure and optical properties of plasmonic NP clusters/assemblies and ultimately help us understand and control the optical properties of them.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132435"},"PeriodicalIF":2.5,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047370","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":"Cryptanalysis of equal-modulus-decomposition-based optical asymmetric cryptosystems using physics-driven deep learning","authors":"Yuhan Jiao ,&nbsp;Yu Li ,&nbsp;Shuixin Pan ,&nbsp;Dajiang Lu ,&nbsp;Meihua Liao","doi":"10.1016/j.optcom.2025.132440","DOIUrl":"10.1016/j.optcom.2025.132440","url":null,"abstract":"<div><div>Optical encryption based on equal modulus decomposition (EMD) is one of the most widely studied optical asymmetric cryptosystems, which can effectively distinguish between the encryption and decryption keys through vector decomposition. However, despite the development of security-enhanced schemes, security risks persist. In this paper, we propose a novel cryptanalysis method for EMD-based cryptosystems using physics-driven deep learning. Our method trains an attack neural network using the EMD encryption process itself, eliminating the need for large amounts of plaintext-ciphertext pairs. By inputting the ciphertext into the neural network and continuously optimizing the parameters based on the error between the re-encrypted and original ciphertexts, we show that the plaintext can be accurately recovered from the ciphertext alone, without the private key. The proposed physics-driven learning-based attack method is applicable not only to the basic EMD-based cryptosystem but also to security-enhanced schemes, providing a flexible approach for evaluating the security of EMD-based optical cryptosystems.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132440"},"PeriodicalIF":2.5,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047372","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":"Low-threshold surface-emitting nanolasers based on guided-mode resonance gratings with deep grooves","authors":"Zhengweiyi Yang,&nbsp;Yiwen Cui,&nbsp;Jiahua Zhang,&nbsp;Kangni Wang,&nbsp;Linyong Qian","doi":"10.1016/j.optcom.2025.132436","DOIUrl":"10.1016/j.optcom.2025.132436","url":null,"abstract":"<div><div>Periodic dielectric structures, such as guided-mode resonance (GMR) gratings, typically serve as optical cavities. However, due to inherent losses, the quality (Q) factor for GMR cavities tends to be low. Here, we numerically report lasing action from a high-Q cavity in one-dimensional (1D) and two-dimensional (2D) GMR gratings featuring deep grooves. We achieve a high-Q state by adjusting the groove depth to slightly shift the resonance away from the bound states in the continuum, which possess an infinite Q factor. By further aligning the resonance wavelength with the emission band of the gain medium, a nanolaser with a low threshold is achieved. Using a four-level gain system and a finite-difference time-domain approach to simulate the active optical responses, we show that optically pumped lasing with directional beam emission is achieved in a GMR grating coated with an organic gain medium. Additionally, we present groove depth-regulated 2D GMR gratings with high Q factors that are notably polarization-independent. We find that the lasing action is slightly influenced by the polarization angle due to distinct electric field distributions, even though the Q factor remains constant. Our design for low-threshold nanolasers shows promise for various photonic applications, including sensing, optical communications, and bio-imaging.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132436"},"PeriodicalIF":2.5,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047371","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}