Photonics and Nanostructures-Fundamentals and Applications最新文献

{"title":"Physics-based transfer learning for neural network surrogates of metal–insulator–metal absorbers","authors":"Sang-Bae Choi,&nbsp;Joonhyub Kim,&nbsp;Chang-Mo Kang","doi":"10.1016/j.photonics.2026.101617","DOIUrl":"10.1016/j.photonics.2026.101617","url":null,"abstract":"<div><div>Cross-fidelity transfer learning is widely used to accelerate neural-network (NN) surrogate modeling of nanophotonic structures, yet its benefit varies unpredictably across structures. We address this gap for physics-based transfer learning (PBTL) of metal–insulator–metal (MIM) absorber surrogates. First, we decompose PBTL into analytical physics features and transfer-matrix-method (TMM) pre-trained weights on three Cr-based absorbers: physics features yield a robust 4%–30% mean-absolute-error (MAE) reduction, while weight-level transfer is positive throughout but fidelity-graded—at matched <span><math><mrow><mi>n</mi><mo>=</mo><mn>350</mn></mrow></math></span> the benefit tracks TMM–rigorous coupled-wave analysis (RCWA) spectral fidelity (＋31.3%, ＋13.5%, ＋9.7% for Structures A, B, C; peak ＋49.7% at <span><math><mrow><mi>n</mi><mo>=</mo><mn>50</mn></mrow></math></span>), and an Au/SiO₂ check is positive on both structures tested. Second, we introduce a raw-output transferability indicator: a joint pilot-set diagnostic combining TMM–RCWA spectral correlation <span><math><mi>r</mi></math></span> (shape) and operating-band MAE (amplitude), with no principal-component projection or pre-trained model. Under controlled noise injection the benefit falls monotonically from ＋47% to −58% at zero fidelity (Spearman <span><math><mrow><mi>ρ</mi><mo>=</mo><mo>−</mo><mn>1.0</mn></mrow></math></span>), and the amplitude MAE predicts the benefit markedly better than shape correlation (<span><math><mrow><mrow><mo>|</mo><mi>P</mi><mi>e</mi><mi>a</mi><mi>r</mi><mi>s</mi><mi>o</mi><mi>n</mi><mo>|</mo></mrow><mo>=</mo><mn>0.98</mn></mrow></math></span> vs. 0.81). Third, negative transfer arises only under controlled degradation—near zero fidelity for Structure A, at moderate noise (<span><math><mrow><mi>σ</mi><mo>=</mo><mn>0.10</mn></mrow></math></span>) for B and C. A 50-sample RCWA pilot (<span><math><mrow><mo>∼</mo><mn>15</mn></mrow></math></span>–30 min) evaluates the diagnostic before the full pipeline (<span><math><mrow><mo>∼</mo><mn>4</mn></mrow></math></span>–5<!--> <!-->h). The framework is solver-pair-agnostic pending broader validation.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101617"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148770672","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":"Geometry-tunable quasi-BICs in WS₂ metasurfaces with engineered polarization response","authors":"Mohammad Danaeifar","doi":"10.1016/j.photonics.2026.101622","DOIUrl":"10.1016/j.photonics.2026.101622","url":null,"abstract":"<div><div>Bound states in the continuum (BICs) offer a powerful route to high quality-factor (Q) resonances with exceptional light confinement. Here, we demonstrate multiple deterministic strategies to engineer tunable quasi-BICs in metasurfaces composed of bulk tungsten disulfide (WS₂) nanocylinders, leveraging geometric symmetry breaking without complex materials or external tuning. By introducing controlled asymmetry—via radial downsizing, elliptical deformation, or semicircular truncation of a single meta-atom within a 2 × 2 supercell—we activate high-Q quasi-BIC resonances with Q-factors 24800. Crucially, these resonances exhibit strong polarization and angular sensitivity: elliptical and semicircular designs enable continuous tuning of resonance wavelength and Q-factor through incident field rotation. The semicircular design, in particular, unveils a rich multi-resonant landscape under varying polarization, enabling multi-wavelength operation within a single unit cell. Our work establishes bulk WS₂ metasurfaces as a robust, CMOS-compatible platform for high-Q nanophotonics, with immediate applications in polarization-selective filtering, rotation sensing, nonlinear optics, and reconfigurable integrated photonic devices, all realized through simple, geometry-driven design.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101622"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148770598","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":"Excitation of surface plasmon waves by 2D defects on metal surfaces: Analytical approach","authors":"Anton V. Dyshlyuk,&nbsp;Oleg B. Vitrik","doi":"10.1016/j.photonics.2026.101637","DOIUrl":"10.1016/j.photonics.2026.101637","url":null,"abstract":"<div><div>The excitation of surface plasmon polaritons (SPPs) by two-dimensional protrusions and depressions on a flat plasmonic metal surface illuminated by a normally incident plane wave is investigated. We employ an analytical approach treating SPPs as waveguide eigenmodes excited by a current source. A model is developed to describe the distribution of effective currents within Gaussian-profile protrusions and depressions responsible for SPP excitation. This approach extends beyond the classical Born approximation for the electromagnetic field intensity inside inhomogeneities by introducing corrections to account for polarization effects. This allows us to derive analytical expressions describing the dimensional (dependence on inhomogeneity size) and spectral (wavelength dependence) characteristics of the SPP response of such structures. The presented theory shows good agreement with the results of full-wave numerical simulations. The proposed approach also demonstrates the difference in SPP response between isolated protrusions/depressions and their arrays forming a periodic corrugation on the metal surface. It is shown that, in the case of sinusoidal gratings, polarization corrections—which are significant for individual inhomogeneities—are not required to quantify the resonant SPP response at the fundamental spatial frequency of the corrugation. The proposed analytical framework reduces computational costs and may serve as a useful tool for the design of nanophotonic devices and plasmonic metamaterials with desired optical properties.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101637"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148934396","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":"Dual-band metalens design with functionality expansion on the HgCdTe detector substrate on-chip","authors":"Zhenhua Ye,&nbsp;Hao Wu,&nbsp;Guanhai Li,&nbsp;Yuanyuan Li,&nbsp;Yue Shen,&nbsp;Xu Zhou,&nbsp;Zetan Cao,&nbsp;Huihao Li,&nbsp;Jindong Wang","doi":"10.1016/j.photonics.2026.101616","DOIUrl":"10.1016/j.photonics.2026.101616","url":null,"abstract":"<div><div>A dual-band metalens structure design based on a Si-substrate mercury cadmium telluride (HgCdTe) planar junction detector is proposed. The metalens was designed with a meta-molecule spatial multiplexing method and is capable of both splitting and focusing light in two infrared wavelength bands. We designed a dual-band spectral splitting metalens operating at wavelengths of 3 μm and 4 μm. By using the multiple physical fields coupling method, we clarified the light transmission mechanism, the spectral splitting principle of the metalens array, and the photoelectric conversion process of the infrared detector.The dual-band detection capability of the HgCdTe detector was simulated. The results indicated that the sub-pixel splitting ratio of this dual-band detector reached up to 86%, and it allowed non-normal incidence for both wavelengths within a certain incident angle of less than 7.5°. The photoelectric response of the coupled infrared detector was consistent with the spectral splitting results of the metalens, with the crosstalk current ratio between sub-pixels not exceeding 13.5%. The calculated photoelectric response results demonstrated that the integrated device was capable of infrared dual-band detection.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"72 ","pages":"Article 101616"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149153423","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 imaging performance in broadband achromatic metalens via optimized meta-atom selection","authors":"Jiaxi Luo,&nbsp;Guangyong Zhang,&nbsp;Zhengyang Wang,&nbsp;Jinbei Chen,&nbsp;Haowen Liang,&nbsp;Juntao Li","doi":"10.1016/j.photonics.2026.101549","DOIUrl":"10.1016/j.photonics.2026.101549","url":null,"abstract":"<div><div>Broadband achromatic metalenses require meta-atoms to provide specific phase responses across a continuous spectral range. In conventional achromatic metalens design, the required phase response is typically assumed to vary linearly with frequency. However, complex meta-atom geometries often introduce nonlinear phase dispersion, which degrades achromatic imaging performance. To address this, we propose a more efficient and accurate meta-atom selection strategy, together with an improved linear fitting scheme for the phase and frequency response of meta-atoms. Using this approach, we design an achromatic metalens with a radius of 84 µm, an operating bandwidth of 850–1850 nm and an effective focal length of 375 µm. Numerical simulations indicate improved imaging performance across the entire operating bandwidth. This work provides a simple and effective approach for high-performance achromatic metalens in imaging and related optical applications.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"71 ","pages":"Article 101549"},"PeriodicalIF":2.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147740902","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":"Combining Purcell effect and air-corner interferometry to determine the decay rates of quantum emitters","authors":"Nicolas Vielmas ,&nbsp;Emmanuel Benichou ,&nbsp;Oriane Bonhomme ,&nbsp;Cécile Cottin-Bizonne ,&nbsp;Thu Nga Pham ,&nbsp;Yann Bretonnière ,&nbsp;Frédéric Lerouge ,&nbsp;Cam Nhung Vu ,&nbsp;Julien Laverdant","doi":"10.1016/j.photonics.2026.101548","DOIUrl":"10.1016/j.photonics.2026.101548","url":null,"abstract":"<div><div>We present a simple dual method that combines white light interferometry and Purcell effects to measure the radiative and non-radiative decay rates of a layer of quantum emitters in a simple configuration. By controlling the local environment of nanoemitters, the local density of optical states, and thus the Purcell factor, is modified. We propose to use an air-corner system as an optical cavity with a continuous variable size. The simultaneous measurement of Purcell modification and cavity size are obtained by measuring simultaneously the lifetime and Fabry-Perot fringes in white lamp. The samples are easily fabricated with two microscope optical cover glasses placed on top of each other and a thin layer of emitters. The decay rates of the emitters, within different cavity sizes, are compared with a model to extract the (non)radiative rates and thus the quantum yield of the emission. An example is presented using graphene quantum dots and compared with previous results.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"71 ","pages":"Article 101548"},"PeriodicalIF":2.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147740903","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":"Gold nanoblock-enhanced MIM waveguide sensor for simultaneous detection of gas and liquid concentrations","authors":"Fumeng Qin,&nbsp;Hao Luo,&nbsp;Yongpeng Ren,&nbsp;Chunlei Li","doi":"10.1016/j.photonics.2026.101552","DOIUrl":"10.1016/j.photonics.2026.101552","url":null,"abstract":"<div><div>To achieve dual-concentration measurement in both gas and liquid environments, this paper designs a sensor structure based on a metal-insulator-metal waveguide. The sensor consists of a half-track cavity and a horseshoe cavity, each coupled to a straight waveguide, with performance enhancement achieved by introducing gold nanoblocks. Numerical simulations are conducted using the finite element method to analyze its transmission characteristics and field distribution. Results indicate that independent control of the dual Fano resonance peaks can be achieved by adjusting structural parameters. After adding gold nanoclusters, the maximum sensitivity reached 3925 nm/RIU, representing a 19% increase compared to the base structure. Lastly, the sensor successfully achieved simultaneous detection of carbon dioxide gas and glucose solution concentrations, with sensitivity values of 0.53 nm/ppm and 0.43 nm·L/g, respectively.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"71 ","pages":"Article 101552"},"PeriodicalIF":2.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147850715","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 thermally and mechanically stabilized plasmonic optical fiber sensor for real-time biomarker monitoring","authors":"Arina Cherednikova ,&nbsp;Victor Labuntsov ,&nbsp;Konstantin Arabuli ,&nbsp;Lidia Mikhailova ,&nbsp;Diana Gagarinova ,&nbsp;Egor I. Dolzhenko ,&nbsp;Kirill Tomyshev ,&nbsp;Dmitry Zuev ,&nbsp;Andrey Bogdanov ,&nbsp;Mikhail V. Zyuzin ,&nbsp;Alexey Kokhanovskiy","doi":"10.1016/j.photonics.2026.101567","DOIUrl":"10.1016/j.photonics.2026.101567","url":null,"abstract":"<div><div>Optical fiber sensors based on surface plasmon resonance (SPR) are powerful tools for biosensing, yet their performance is often hindered by thermal and mechanical instability. This work presents the design, fabrication, and characterization of an integrated optofluidic platform that overcomes these environmental limitations. A tilted fiber Bragg grating (TFBG) with an 11° tilt angle was coated with a numerically optimized bilayer of 5 nm chromium and 45 nm gold to achieve a strong plasmonic response. To ensure measurement reliability, the TFBG-SPR sensor was encapsulated within a PDMS microfluidic chip, which was mounted on a Peltier element for active thermal regulation. This system provides robust mechanical shielding and maintains a stable temperature of 27 °C with a precision of ±0.02 °C, effectively eliminating signal drift. A robust signal demodulation algorithm using Fourier filtering was implemented to accurately determine the SPR wavelength from the complex transmission spectrum. The sensor exhibited a sensitivity of 552 nm/RIU to refractive index changes. The platform's performance was validated by monitoring the real-time immobilization of bovine serum albumin, which resulted in a permanent wavelength shift of 1 nm. The successful integration of the plasmonic fiber sensor into a stabilized microfluidic environment demonstrates a reliable and highly sensitive \"Lab-on-a-Fiber\" system suitable for practical biosensing applications.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"71 ","pages":"Article 101567"},"PeriodicalIF":2.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147991180","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":"Quasi-BIC enabled critical coupling for high-Q near-perfect infrared absorption","authors":"Haoxiang Xia,&nbsp;Tongtong You,&nbsp;Dengke Luo,&nbsp;Dayuan Xiong","doi":"10.1016/j.photonics.2026.101583","DOIUrl":"10.1016/j.photonics.2026.101583","url":null,"abstract":"<div><div>Highly selective narrowband infrared responses are fundamentally constrained by the trade-off between spectral bandwidth and absorption efficiency in conventional photonic structures. Here, we propose a dielectric metasurface supporting quasi-bound states in the continuum (quasi-BIC) by introducing controllable symmetry breaking into an ideal BIC configuration, enabling efficient coupling between free-space radiation and subwavelength resonant modes. The quasi-BIC resonance originates from the destructive interference between electric and magnetic dipole modes, resulting in strong electromagnetic field confinement and enhanced light–matter interaction within the metasurface. Numerical simulations and theoretical analysis show that the proposed structure achieves near-perfect absorption at 6.64 µm with an ultranarrow spectral linewidth and a Q factor beyond 2000, while exhibiting pronounced angular selectivity with suppressed response outside 20°. By integrating quantum well infrared photodetector (QWIP) as the active absorbing medium, the proposed quasi-BIC metasurface provides a viable photonic mechanism and design strategy for realizing highly selective narrowband infrared detection.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"71 ","pages":"Article 101583"},"PeriodicalIF":3.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148565177","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":"Waveguide higher mode pumping through a dielectric resonator","authors":"A.A. Zarenin,&nbsp;V.D. Burtsev,&nbsp;D.S. Filonov","doi":"10.1016/j.photonics.2026.101547","DOIUrl":"10.1016/j.photonics.2026.101547","url":null,"abstract":"<div><div>Waveguides are usually not used at frequencies close to or above the second critical frequency, due to a transition to multimode regime and dispersion losses. Our paper shows how this obstacle can be overcome in a non-destructive way by inserting a dielectric resonator. Here, we consider a model consisting of a bent waveguide section that generates higher-order harmonics and a compensating cylindric resonator. We examine both symmetric and asymmetric compensation methods for higher-order modes by modifying the resonator arrangement. The obtained results make it possible to modify information and telecommunication and measurement systems in such a way as to directly pump energy into one of the higher modes, ignoring the rest. Thus, even waveguide systems designed for low frequencies can be used higher frequencies, simplifying the measurement of highly anisotropic substances and large samples.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"71 ","pages":"Article 101547"},"PeriodicalIF":2.9,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147651058","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}