{"title":"Tunable 4 × 4 optical router based on graphene-silicon waveguide microring switches","authors":"Cong Hu, Mingyue Xie, Tian Zhou, Aijun Zhu, Pengxing Guo, Lijuan Zhang, Xijun Huang","doi":"10.1007/s10043-026-01055-5","DOIUrl":"10.1007/s10043-026-01055-5","url":null,"abstract":"<div><p>Optical routers serve as the core functional units of Photonic Networks on Chip (PNoC). Traditional optical routers face bottlenecks such as large footprints and high insertion loss. This paper proposes a tunable 4 × 4 on-chip optical router architecture realized using only four graphene-silicon microring optical switch units. Each optical switch unit integrates a monolayer graphene/HfO<sub>2</sub>/Si capacitive structure within its microring region. By continuously tuning the graphene chemical potential through an applied bias voltage, the effective refractive index of the coupled waveguide and the resonance peak shift are modified, enabling Bar/Cross state switching and achieving port routing reconfiguration. Through topological parameter optimization, the proposed optical router occupies only approximately 2500 μm<sup>2</sup> with a minimum insertion loss of 0.77 dB, minimum link crosstalk of − 21.18 dB, and a maximum port signal-to-noise ratio of 23.55 dB, a modulation speed of 25.15 GHz, and a response time of 13.92 ps. These results demonstrate that the proposed scheme combines low loss, fast response, and compact integration, and thus provides a compact, low-power routing-node candidate for highly integrated PNoC interconnect networks.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"33 3","pages":"364 - 378"},"PeriodicalIF":1.0,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782166","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}
Optical ReviewPub Date : 2026-06-16DOI: 10.1007/s10043-026-01061-7
Ji Zhang, Rui Xu, Yudong Zhang, Rongzhen Jiao
{"title":"The performance of asynchronous measurement device independent quantum key distribution under dense wavelength-division-multiplexing","authors":"Ji Zhang, Rui Xu, Yudong Zhang, Rongzhen Jiao","doi":"10.1007/s10043-026-01061-7","DOIUrl":"10.1007/s10043-026-01061-7","url":null,"abstract":"<div><p>Two practical issues are investigated for asynchronous measurement-device-independent quantum key distribution (asynchronous MDI-QKD) operated with dense wavelength-division multiplexing (DWDM): the choice of the post-matching window (<span>(T_c)</span>) and the impact of adjacent-channel crosstalk on the secret key rate. Within a three-intensity decoy-state protocol with finite-size effects, a quantitative key-rate model is developed that links transmission distance, post-matching statistics, and phase-error accumulation, enabling the distance-dependent optimal <span>(T_c)</span> to be determined. The model is then extended to multi-channel DWDM by incorporating a crosstalk-induced effective detector-noise model that scales with the number of wavelength channels. Building on this unified framework, full parameter optimization of signal/decoy intensities and their sending probabilities is performed using a local search algorithm. Numerical results provide practical design guidelines, indicating when the optimal <span>(T_c)</span> is essentially insensitive to channel count and when DWDM scalability is ultimately constrained by crosstalk growth.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"33 3","pages":"428 - 436"},"PeriodicalIF":1.0,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782164","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}
Optical ReviewPub Date : 2026-06-16DOI: 10.1007/s10043-026-01060-8
Dongwen Tian, Jinghuan Ge, Na Su, Qian Cao
{"title":"Color spectral reflectance prediction model based on machine learning","authors":"Dongwen Tian, Jinghuan Ge, Na Su, Qian Cao","doi":"10.1007/s10043-026-01060-8","DOIUrl":"10.1007/s10043-026-01060-8","url":null,"abstract":"<div><p>In the process of color reproduction, accurate prediction of the color characteristics of color halftone images and the establishment of a color prediction model for the spectral reflectance of halftone images is an issue of great concern in the field of print image device characterization and color print image quality control. Traditional models such as Murray-Davis, Clapper-Yule, Yule-Nielsen and modified Yule-Nielsen spectral Neugebauer models are widely used in this field due to their excellent color and spectral prediction accuracy. However, current research shows that none of these models takes into account the use of black ink in the printing process, which is a significant limitation in predicting the spectral properties of CMYK four-color inks. Additionally, these models have relatively large errors in predicting light color tones. In this study, we employ Neugebauer’s equation to extend the conventional 4-color CMYK input to 16-color inputs with a least-squares support vector machine (LSSVM) model optimized by an improved particle swarm optimization (IPSO) algorithm. The spectral reflectance output is efficiently reduced and restored by a PCA-based principal component extraction algorithm, which ensures a high degree of accuracy of the spectral reflectance in the dataset, with a principal component contribution of up to 99.99%. The experimental results show that the proposed model has significantly lower RMSE values and CIEDE2000 color differences compared to existing methods. Thus, it can effectively reduce the color differences in the printing process, greatly reduce material and energy consumption, and significantly improve the quality of printed images.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"33 3","pages":"408 - 419"},"PeriodicalIF":1.0,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782163","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}
Optical ReviewPub Date : 2026-06-16DOI: 10.1007/s10043-026-01056-4
Xinkai Wang, Huibin Wang, Minwen Xu, Wenlei Yang
{"title":"Simultaneous measurement of temperature and strain or temperature and curvature based on π-phase-shifted long period fiber grating","authors":"Xinkai Wang, Huibin Wang, Minwen Xu, Wenlei Yang","doi":"10.1007/s10043-026-01056-4","DOIUrl":"10.1007/s10043-026-01056-4","url":null,"abstract":"<div><p>We propose a π-phase-shifted long period fiber grating (π-PS-LPFG) sensor capable of simultaneously measuring temperature and strain or temperature and curvature. The π-PS-LPFG is prepared by introducing a π phase shift at the center offset position of the long period fiber grating through precise control of two stepping motors using filament heating method. The transmission spectrum of the π-PS-LPFG exhibits two adjacent attenuation bands following the introduction of a π phase shift. Experiments were conducted to assess the sensor’s characteristics in terms of strain, curvature, and temperature, thereby validating its capability for simultaneous measurement of temperature and strain or temperature and curvature through cross-matrix equations. Experimental results indicate that the sensor demonstrates excellent sensitivity, with sensitivities for temperature, curvature, and strain measured at 74 pm/°C, −7.5 nm/m⁻¹, and − 5.2 pm/µε respectively. Moreover, the sensor features low manufacturing cost, simple structure, and high sensitivity, emphasizing its considerable potential for applications in multi-parameter sensing.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"33 3","pages":"379 - 390"},"PeriodicalIF":1.0,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782167","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}
{"title":"Simulation-based investigation of an optimized SPR sensor for enhanced detection of cancer biomarkers in serum","authors":"Fitri Suryani Arsyad, Dicky Abdurrahman Fajri, Amiruddin Supu, Siti Nasuha Mustaffa, Dilla Duryha Berhanuddin, P. Susthitha Menon","doi":"10.1007/s10043-026-01053-7","DOIUrl":"10.1007/s10043-026-01053-7","url":null,"abstract":"<div><p>This study numerically assesses the performance of a Surface Plasmon Resonance (SPR) sensor for the detection of cancer markers and blood samples based on their refractive index (RI). Utilizing FDTD software, the sensor was modeled using a Kretschmann configuration optimized with a 50 nm gold thin film and evaluated at two operational wavelengths: 670 nm and 785 nm. The investigation first analyzed blood samples across a physiological RI range of 1.36 to 1.44, establishing a detection baseline. Results demonstrate that the 785 nm wavelength is the superior operational choice, significantly extending the blood detection range up to an RI of 1.42, whereas the 670 nm wavelength was restricted to an RI of 1.38. Building on this baseline, the sensor was tested against six specific cancer markers (represented by the cell lines Basal, HeLa, Jurkat, PC-12, MCF-7, and MDA-MB-231). At 670 nm, the sensor unable to generate a resonance signal for five of the six high-RI cancer markers. In sharp contrast, the 785 nm configuration successfully detected all tested cancer markers, yielding a high sensitivity of 180.5642°/RIU for Jurkat cells and a peak sensitivity of 142.0188°/RIU for blood samples. These findings confirm the high potential of the optimized SPR sensor structure for biomedical diagnostics, particularly when operating at a 785 nm wavelength.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"33 3","pages":"340 - 350"},"PeriodicalIF":1.0,"publicationDate":"2026-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148781966","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}
Optical ReviewPub Date : 2026-06-09DOI: 10.1007/s10043-026-01057-3
Moneera A. Ahmed, Bushra A. Hasan
{"title":"Preparation and characterization of ZnO: Ga2O3 thin film via pulsed laser deposition for NO2 and H2S gas sensing application","authors":"Moneera A. Ahmed, Bushra A. Hasan","doi":"10.1007/s10043-026-01057-3","DOIUrl":"10.1007/s10043-026-01057-3","url":null,"abstract":"<div><p>In this study, thin film of pure zinc oxide (ZnO) and ZnO doped with Ga<sub>2</sub>O<sub>3</sub> films with different concentrations (0, 0.03, 0.05, 0.07 and 0.09)wt% were prepared by pulsed laser deposition. The powder mixture was then sintered in a furnace at 1273 K for 5 h. The resulting powders were thoroughly ground and then pressed using a special press to form discs with a diameter of 1 cm and a thickness of 0.5 cm. The deposition was carried out under a vacuum of 2.5 × 10<sup>− 2</sup> mbar on various substrates, including glass for AFM measurements and n-type crystalline silicon wafers for the gas sensor. AFM results revealed a progressive increase in both grain size and roughness with moderate doping and irregularity at high doping levels. Gas-sensing measurements for the oxidizing gas (NO<sub>2</sub>) and the reducing gas (H<sub>2</sub>S) were conducted by measuring resistance in the absence and presence of each gas. The prepared sensors (ZnO: Ga<sub>2</sub>O<sub>3</sub>) on n-type silicon substrates showed maximum sensitivity (1076.31) at a doping ratio of 3% and an operating temperature of 373 K for nitrogen dioxide gas, with a response time 31.5 s, while the highest sensitivity to H<sub>2</sub>S gas was 24.53 for pure ZnO at operating temperature of 373 K with a response time of 33.3s. The sensor exhibited remarkable selectivity for NO2 gas due to its oxidizing nature; it extracts electrons from the conduction band of zinc oxide (ZnO), which leads to the expansion of the depletion layer and a significant change in electrical resistance.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"33 3","pages":"391 - 399"},"PeriodicalIF":1.0,"publicationDate":"2026-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148781965","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}
Optical ReviewPub Date : 2026-06-02DOI: 10.1007/s10043-026-01046-6
Ryuichi Ohta
{"title":"Mechanical and acoustic engineering of light-matter interaction in rare-earth materials toward highly coherent photon-electron–phonon hybrid system","authors":"Ryuichi Ohta","doi":"10.1007/s10043-026-01046-6","DOIUrl":"10.1007/s10043-026-01046-6","url":null,"abstract":"<div><p>Rare-earth ions are attractive platforms for quantum optics and quantum information technologies because they exhibit long-lived optical and spin coherence. In parallel, rapid progress in nanophotonics and nanophononics has accelerated the development of hybrid quantum systems including rare-earth dopants in solid-state devices. This review highlights recent advances in rare-earth-based opto-electro-mechanical architecture, where phononic structures enable acoustic tailoring of optical properties of rare-earth ions. We reveal fundamental physics on the interaction among telecom-wavelength photons, long-lived electrons, and acoustic phonons in rare-earth-doped materials and provide potential technological implications of this emerging field.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"33 3","pages":"542 - 554"},"PeriodicalIF":1.0,"publicationDate":"2026-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782340","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}
Optical ReviewPub Date : 2026-05-30DOI: 10.1007/s10043-026-01054-6
Yuyang Han, Qiang Yong, Zhe Liu, Ruotong Mu, Ming Yang, Haoqian Lv, Yuqing Du, Yongbin Qi, Hao Zhang, Shaomin Yang, Qiang Yang, Qiang Liu
{"title":"Acquisition-adaptive high-throughput minute target detection framework for label-free imaging flow cytometry","authors":"Yuyang Han, Qiang Yong, Zhe Liu, Ruotong Mu, Ming Yang, Haoqian Lv, Yuqing Du, Yongbin Qi, Hao Zhang, Shaomin Yang, Qiang Yang, Qiang Liu","doi":"10.1007/s10043-026-01054-6","DOIUrl":"10.1007/s10043-026-01054-6","url":null,"abstract":"<div><p>Imaging Flow Cytometry (IFC) combines the high-throughput capabilities of flow cytometry with morphological insights. However, commercial systems are prohibitively expensive, while low-cost alternatives typically suffer from motion blur and low signal-to-noise ratios (SNR), impeding the real-time detection of minute targets. To address these challenges, we propose a Acquisition-Adaptive Minute Target Detection Framework that establishes a hardware-software synergistic paradigm using off-the-shelf components. We introduce the SM-YOLO model, explicitly designed to compensate for imaging defects in high-speed flow environments. This architecture integrates Space-to-Depth Convolution (SPD-Conv) to prevent feature dispersion during downsampling and employs Monte Carlo Attention (MCAttn) to probabilistically suppress fluid background noise. Furthermore, a Mixed Depth Connection Strategy is utilized to resolve dense occlusions. Experimental results on a self-built dataset demonstrate that our framework achieves an inference speed of 1129.9 FPS with 94.5% mAP50, providing an approximately 4.5-fold computational redundancy over the high-speed monochrome camera acquisition rate (250 FPS). Furthermore, the system demonstrates robust generalization capabilities across varying noise levels, validating the proof-of-concept (PoC) feasibility of low-cost, high-precision high-throughput detection through efficient algorithmic compensation. This provides a scalable PoC framework for laboratory and future biomedical applications.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"33 3","pages":"351 - 363"},"PeriodicalIF":1.0,"publicationDate":"2026-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148289421","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}
Optical ReviewPub Date : 2026-05-14DOI: 10.1007/s10043-026-01037-7
Yalin Zhang, Hengyi Song, Yifei Jia, Chao Nie, Hongjie Yang, Xuling Liu, Shaobo Jin, Wenbin He, Guoyong Ye
{"title":"Performance of arbitrary order vortex beam array as optical link","authors":"Yalin Zhang, Hengyi Song, Yifei Jia, Chao Nie, Hongjie Yang, Xuling Liu, Shaobo Jin, Wenbin He, Guoyong Ye","doi":"10.1007/s10043-026-01037-7","DOIUrl":"10.1007/s10043-026-01037-7","url":null,"abstract":"<div><p>Utilizing wave optics simulations and multi-layer phase screen models, this study systematically investigates the propagation characteristics of arbitrary-order vortex beams (AOVBs) and arbitrary-order vortex beam arrays (AOVBAs) in atmospheric turbulence channels. Key metrics, including the aperture-averaged scintillation index, the mean signal-to-noise ratio (SNR), and the mean bit error rate (BER), are evaluated to assess their performance in turbulent atmospheric conditions, with a particular emphasis on their potential as spatial optical communication links. The findings elucidate the impact of topological charge and the number of beamlets on the propagation behavior and communication performance of these optical beams, providing valuable insights into the optimization of optical link design.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"33 2","pages":"214 - 220"},"PeriodicalIF":0.9,"publicationDate":"2026-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148060932","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}
{"title":"Terahertz mode switching and wavefront manipulation with a temperature-controlled reconfigurable metasurface","authors":"Lijian Zhang, Tianle Wei, Xuyang Chen, Chuang Gao, Zepeng Zhao, Xuejiao Hu, Jie Cheng","doi":"10.1007/s10043-026-01052-8","DOIUrl":"10.1007/s10043-026-01052-8","url":null,"abstract":"<div><p>With the ever-growing demand for optical-field manipulation, achieving multimodal and reconfigurable wavefront control within a single device has become a central focus in metasurface research. Based on the Pancharatnam–Berry (PB) phase principle, this work proposes a temperature-tunable reflective metasurface leveraging the phase-transition characteristics of vanadium dioxide <span>(left( {{text{VO}}_{{mathbf{2}}} } right))</span>. By regulating the dielectric–metal phase change of VO<span>({{text{VO}}_{{mathbf{2}}} })</span>, the designed OAM device enables the switchable generation of OAM beams with topological charges of <span>({mathbf{ - 1}})</span> and <span>({mathbf{ - 2}})</span> at low and high temperatures, with mode purities of 84% and 81%, respectively. Furthermore, we design a dual-functional integrated metasurface that enables temperature-controlled switching between OAM-beam manipulation and beam focusing: OAM beams are generated at low temperature, while efficient beam focusing is achieved at high temperature. This single structure thus achieves dual functionalities of mode control and energy concentration. The proposed approach offers a promising pathway for the development of multifunctional, programmable, and dynamically tunable optical devices and holds broad application prospects in optical communications, information processing, quantum information, and super-resolution imaging.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"33 3","pages":"329 - 339"},"PeriodicalIF":1.0,"publicationDate":"2026-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148289423","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}