Optics Communications最新文献

{"title":"Optimizing chromatic dispersion control at discrete wavelengths using dual-layer harmonic diffraction elements","authors":"Hongfang Yang,&nbsp;Jing Xiao,&nbsp;Lian Zhang","doi":"10.1016/j.optcom.2025.132525","DOIUrl":"10.1016/j.optcom.2025.132525","url":null,"abstract":"<div><div>This paper presents a design approach for dual-layer harmonic diffraction gratings (DL-HDEs) focused on optimizing chromatic dispersion control at discrete wavelengths. We propose a method to achieve near-100 % diffraction efficiency at multiple separated wavelengths while ensuring minimal variation in their diffraction angles, thereby substantially reducing overall dispersion. Unlike traditional harmonic diffractive elements (HDEs) or multi-layer diffractive optical elements (MLDOEs) that suffer from significant chromatic dispersion, this dual-layer design delivers enhanced wavelength-specific performance by leveraging complementary material dispersion and structural optimization. Through independent simulations of the component itself in this study, the influence of other components and other optimization factors is excluded, the DL-HDEs exhibit stable diffraction angles across target wavelengths (dispersion coefficient &lt;0.05°/μm) and concentrated energy distribution in focal plane spots, making them well-suited for multi-spectral imaging, laser systems, and other applications requiring precise wavelength control. This work provides a promising pathway for developing compact, high-fidelity optical systems in targeted spectral bands.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132525"},"PeriodicalIF":2.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221406","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":"Plasmonic coupling effect on dephasing time of asymmetric gold nanodimers in capacitive, conductive and overlapping regimes","authors":"Merneh Mandado Mana ,&nbsp;Boyu Ji ,&nbsp;Bereket Dalga Dana ,&nbsp;Alemayehu Nana Koya ,&nbsp;Jingquan Lin","doi":"10.1016/j.optcom.2025.132520","DOIUrl":"10.1016/j.optcom.2025.132520","url":null,"abstract":"<div><div>Revealing the spectral and temporal dynamics of hybrid plasmonic modes in strongly interacting plasmonic nanodimers, including capacitively coupled dimer (CaCD), conductively coupled dimer (CoCD), and overlapping dimer (OLD) nanostructure is important for such applications as sensing, enhanced spectroscopy and plasmonic lasers. We theoretically present near field spectral signatures in three asymmetric nanodisk-nanorod (ND-NR) dimers configurations via Finite difference time domain (FDTD) simulation, and investigate the corresponding dephasing time of coupled plasmon modes supported by these nanoparticle dimers using Quasi-Normal mode (QNM). In our results from near-field spectrum fitting across three regimes, we found dephasing times of Fano resonance mode in CaCD is 4.94fs, CTP mode in CoCD is 5.26 fs and BDP mode in OLD is 3.50 fs respectively. This implies that CTP mode in conductively connected nanoparticle exhibit longer dephasing time compared to those in capacitive coupling and overlapping dimers. Moreover, the dephasing time can be further manipulated by varying nanoparticle and connecting junction parameters. Thus, our investigation opens up alternative opportunities for the application of plasmon based sensing, enhanced spectroscopy, non-linear optics and plasmon lasers.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132520"},"PeriodicalIF":2.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221537","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":"Theoretical study of the influence of wavelength on bandwidth of newly designed multimode doubly clad W-type GI silica photonic crystal fiber","authors":"Ana Simović ,&nbsp;Branko Drljača ,&nbsp;Konstantinos Aidinis ,&nbsp;Xiong Deng ,&nbsp;Svetislav Savović","doi":"10.1016/j.optcom.2025.132522","DOIUrl":"10.1016/j.optcom.2025.132522","url":null,"abstract":"<div><div>In this study, we use the power flow equation (PFE) to analyze the wavelength-dependent transmission characteristics of a newly designed multimode doubly clad W-type silica photonic crystal fiber (SPCF) structure with a graded-index (GI) core. Our results show that narrowing the inner cladding of the multimode doubly clad W-type GI SPCF boosts bandwidth by reducing number of guided modes and modal dispersion. The bandwidth rises from 0.95 GHz km at 650 nm to 9.8 GHz km at 850 nm, before decreasing to 0.38 GHz km at 1310 nm and further to 0.35 GHz km at 1550 nm. At 850 nm, the core's refractive index becomes parabolic, minimizing modal dispersion and yielding the highest bandwidth of 9.8 GHz km. In comparison, standard OM4 and OM5 multimode silica optical fibers (SOFs) have a bandwidth of 4.7 GHz km at 850 nm and significantly lower bandwidth at 650 nm (200 MHz km) and 1310/1550 nm (500 MHz km). The W-type GI SPCF achieves a higher bandwidth-length product of ∼1 GHz km at 650 nm and ∼700 MHz km at 1310 and 1550 nm. We also observe that radial offset slightly impacts bandwidth at short lengths but has minimal effect at longer lengths due to mode coupling. A key advantage of SPCFs is their tunability—air-hole diameters and pitches can be precisely adjusted without the complex doping required for standard SOFs.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132522"},"PeriodicalIF":2.5,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221536","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":"Ghost imaging for remote sensing: Experimental demonstration utilizing humidifier-simulated fog","authors":"Rehmat Iqbal ,&nbsp;Cao Jie ,&nbsp;Lin Kai ,&nbsp;Qun Hao","doi":"10.1016/j.optcom.2025.132508","DOIUrl":"10.1016/j.optcom.2025.132508","url":null,"abstract":"<div><div>Imaging under challenging atmospheric conditions, such as fog or haze, poses a substantial challenge in remote sensing due to light scattering and signal degradation inherent in conventional imaging methods. To address this issue, this paper presents a practical experimental demonstration of ghost imaging (GI) through water fog simulated by a humidifier, highlighting its potential for remote sensing under adverse conditions. Utilizing a controlled fog chamber, LED illumination, a digital micromirror device (DMD), and a single-pixel detector (SPD), we demonstrate that GI can reconstruct images under dense fog (<span><math><mrow><mi>β</mi><mo>=</mo><mn>2</mn><mo>.</mo><mn>87</mn><mspace></mspace><mtext>dB/m</mtext></mrow></math></span>) with minimal measurements and achieve high-quality results at a low sampling ratio (3%) under medium fog (<span><math><mrow><mi>β</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>40</mn><mspace></mspace><mtext>dB/m</mtext></mrow></math></span>). Furthermore, post-processing enhancement techniques, including guided filtering, Contrast Limited Adaptive Histogram Equalization (CLAHE), and denoising, are applied to enhance the quality of the reconstructed images by addressing GI-specific challenges, such as correlation-based noise and artifacts. This work provides empirical evidence for the feasibility of GI in foggy environments, paving the way for applications in autonomous navigation and environmental monitoring.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132508"},"PeriodicalIF":2.5,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221533","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 sensitive fiber optic temperature sensor based upon Fabry-Perot cavity directly fabricated from PMMA slab","authors":"Cheng Peng,&nbsp;Chao Jiang,&nbsp;Rui Li,&nbsp;Qun Zhang,&nbsp;Peiji Liang,&nbsp;Xiaoshan Guo,&nbsp;Simei Sun","doi":"10.1016/j.optcom.2025.132513","DOIUrl":"10.1016/j.optcom.2025.132513","url":null,"abstract":"<div><div>A novel ultrasensitive optical fiber temperature sensor is proposed and experimentally validated. Temperature sensing is achieved using a Fabry-Perot interferometer (FPI) manufactured directly from the thermosensitive material polymethyl methacrylate (PMMA) slab. Firstly, we used a CO₂ laser to ablate a micro groove on the PMMA slab, and then two single-mode fibers (SMF) with flat cut end faces are placed in the micro groove from both sides, aligning their two reflective surfaces, then the SMF on both sides are firmly fixed using ultraviolet glue to form an FPI, named FPI₁. When heating FPI₁, the expansion of the PMMA slab elongates the F-P cavity length in FPI₁, resulting in the variation of the optical path difference of light transmitted in FPI₁, causing the dip wavelength of FPI₁ spectrum to drift, thus achieving temperature measurement. Due to the high coefficient of thermal expansion and contraction of PMMA slab, the temperature of a single FPI₁ reaches 13.35 nm/°C. To further amplify the temperature sensitivity of FPI₁, we introduced optical vernier effect technology to construct sensor S₁. FPI₁ and FPI₂ are paralleled to form S₁. FPI₂ is fabricated by sequentially fusion splicing SMF - capillary - SMF, and its free spectral range is close to that of FPI₁. FPI₂ has low temperature sensitivity and is acted as the reference interferometer in S₁. The experimental findings display that the sensitivity of S₁ reaches 115.67 nm/°C, which is the highest temperature sensitivity currently known. It has developed the temperature sensitivity of FPI₁ by nearly 8.7 times. In summary, the proposed sensor has a simple structure, easy producing, low cost, robustness, and highly sensitive, making it one of the optimal choices for temperature measurement in industrial applications.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132513"},"PeriodicalIF":2.5,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221538","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":"Enhanced QKD protocol based on zero-knowledge proof and post-quantum signature","authors":"Anqi Chi ,&nbsp;Lin Bi ,&nbsp;Gopal Verma ,&nbsp;Xiaoqiang Di","doi":"10.1016/j.optcom.2025.132431","DOIUrl":"10.1016/j.optcom.2025.132431","url":null,"abstract":"<div><div>Quantum communication uses the principles of quantum mechanics to ensure information security. Quantum key distribution (QKD) transmits quantum states through optical fibers and is the most mature technology. Based on the non-cloning and uncertainty principles, it ensures that keys can be shared securely even in the face of quantum computers. BB84 is widely used due to its complete theory and simple fiber implementation, but it has limitations, such as the fragility of classical channels, which are susceptible to man-in-the-middle attacks and message tampering. To address the above problems, we proposed a new ZKP-Signature BB84 protocol, which uses Schnorr zero-knowledge proof to strengthen identity authentication, uses Dilithium post-quantum signatures to ensure the authenticity and integrity of messages, and improves security through classical channel reinforcement. Simulation results show that ZKP-Signature BB84 can resist a variety of attacks including man-in-the-middle attacks. This study provides new ideas for improving the security of QKD systems and expanding future systems, and helps to derive the further development of quantum communication technology.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132431"},"PeriodicalIF":2.5,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221540","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":"Performance-enhanced orthogonal time frequency space system based on probabilistic shaping","authors":"Yanyi Wang ,&nbsp;Heng Lin ,&nbsp;Yingxiong Song ,&nbsp;Jianjun Yu","doi":"10.1016/j.optcom.2025.132498","DOIUrl":"10.1016/j.optcom.2025.132498","url":null,"abstract":"<div><div>In this paper, a probabilistically shaped orthogonal time frequency space (PS-OTFS) modulation is proposed and experimentally demonstrated in a photonics-assisted millimeter-wave system. The probabilistic amplitude shaping (PAS) architecture is employed to generate PS quadrature amplitude modulation (PS-QAM) symbols, which are subsequently mapped into the delay-Doppler (DD) domain for OTFS modulation. At the receiver, pilot-assisted channel estimation is utilized to estimate the channel, and a message passing (MP) detector is adopted for symbol detection. Under the condition of a normalized generalized mutual information (NGMI) threshold of 0.92, the experimental results show that PS-16QAM achieves a 0.3 dB improvement in receiver sensitivity compared to uniform 16QAM, while PS-64QAM achieves a 0.5 dB improvement over uniform 64QAM. Furthermore, a net rate of 13.82 Gbit/s is achieved in the experiment over a 0.8-meter wireless link under delay and Doppler spread channels, demonstrating the potential of the proposed system for future 6G wireless communication networks.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132498"},"PeriodicalIF":2.5,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221408","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":"Experimental evaluation of tilted secondary mirror-based forward motion compensation in high-resolution earth observation systems","authors":"Özgür Selimoğlu ,&nbsp;Ümit Yılmaz ,&nbsp;M. Fatih Kılıçaslan","doi":"10.1016/j.optcom.2025.132512","DOIUrl":"10.1016/j.optcom.2025.132512","url":null,"abstract":"<div><div>This study comprehensively investigates the utilization of the opto-mechanical Tilted Secondary Mirror Method for Forward Motion Compensation (TSM-FMC) in satellite cameras. Unlike the approaches existing in the literature, the forward motion caused by the orbital movement of the satellite has been compensated by intentionally misaligning the secondary mirror of the Ritchey-Chretien (RC) Cassegrain telescope by applying tilt movement to generate image flow in reverse direction. The primary objective is to offer a cost-effective and mechanically simpler alternative to Time Delay Integration (TDI) sensors and scanning mirrors, which are widely used in high-resolution Earth Observation Satellite (EOS) cameras. In order to simulate the effects of satellite orbital motion a laboratory-based imaging simulator has been used. The experimental studies have demonstrated that satellite camera exposure time can be increased by 52 times and that focal plane image shifts due to satellite orbital motion can be compensated with a residual pixel shift of 0.62.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132512"},"PeriodicalIF":2.5,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221532","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":"Training-free spectrum sampling strategy in Fourier single-pixel imaging via Deep Image Prior","authors":"Wei Lun Tey ,&nbsp;Mau-Luen Tham ,&nbsp;Yeong-Nan Phua ,&nbsp;Lei Liu ,&nbsp;Sing Yee Chua","doi":"10.1016/j.optcom.2025.132502","DOIUrl":"10.1016/j.optcom.2025.132502","url":null,"abstract":"<div><div>Fourier Single-pixel Imaging (FSI) reconstructs images by acquiring frequency domain information via a single-pixel detector. However, existing sampling strategies, whether predefined or data-driven, struggle to achieve a training-free, adaptive solution that balances efficiency with reconstruction quality. This paper proposes a novel training-free spectral sampling strategy based on Deep Image Prior (DIP) which is used for Fourier spectrum estimation to overcome the limitations of existing methods. By re-purposing DIP’s inpainting capability, the Fourier magnitude map is treated as an image to be inpainted, enabling adaptive, scene-specific estimation of the illumination order—without any external datasets or training. The approach leverages the structural equivalence between spatial and spectral domains and completes reconstruction using standard compressed sensing (CS) techniques. Experiments on natural and synthetic images demonstrate reconstruction performance gains over existing conventional and variable density sampling schemes, with up to 40% reduction in processing time compared to prior adaptive methods. Unlike existing methods, the proposed approach avoids redundant sampling, generalizes well across diverse image types, and remains entirely training-free.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132502"},"PeriodicalIF":2.5,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221542","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":"A novel optical image encryption method based on Fourier single-pixel imaging using a deception strategy","authors":"Zeng Tianyu ,&nbsp;Sui Liansheng ,&nbsp;Lu Haiwei ,&nbsp;Du Cong ,&nbsp;Xiao Zhaolin","doi":"10.1016/j.optcom.2025.132514","DOIUrl":"10.1016/j.optcom.2025.132514","url":null,"abstract":"<div><div>As an advanced technology, Fourier single-pixel imaging can be used to obtain the spectral information of a target image by utilizing active illumination with sinusoidal patterns. Nevertheless, in order to ensure the integrity of image restoration, it is inevitable to generate a large number of illumination patterns to record light intensity values reflected from the target image in the imaging process. In this paper, a novel optical image encryption method is proposed based on Fourier single-pixel imaging and phase retrieval algorithm. To reduce the number of illumination patterns, a barcode image composed of horizontal strips is randomly generated and used as the target image in the imaging process. Due to the sparse distribution of its Fourier spectrum, less number of spatial frequencies are measured. Thus, less number of sinusoidal patterns are generated to collect light intensity values. The ciphertext is a real-valued sequence through integrating these collected values. Moreover, a new phase retrieval algorithm with high convergence speed is designed under the framework of double random phase coding in Fresnel domain. Considering the barcode image as the constraint, the plaintext image is encoded to two phase-only masks that can be served as the secret keys. The main advantage of this method is that the security can be enhanced by applying a deception strategy for eavesdroppers, namely there is no direct relationship between the encryption process of the plaintext image and the generation process of the ciphertext sequence. Even an eavesdropper knows that the ciphertext sequence is obtained using the Fourier single-pixel imaging, only the barcode image can be reconstructed using correlation algorithm, and the content of the plaintext image is not leaked at all. Through simulated and optical experiments, the feasibility and robustness of the proposed method have been demonstrated, and the plaintext image can be recovered at a lower sampling ratio, i.e., only approximate one-quarter of the spatial frequencies are recorded. To our best knowledge, it is first time to implement an image encryption using the deception mechanism, which can provide a new perspective for using Fourier single-pixel imaging in the field of optical information security.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"596 ","pages":"Article 132514"},"PeriodicalIF":2.5,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221543","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}