Pub Date : 2025-11-28DOI: 10.1016/j.photonics.2025.101488
Qi Wu, Shuo Yang, Shan Wu
In this work, a metasurface consisting of periodic arrays of asymmetric elliptical bi-silicon cylinders with out-of-plane symmetry breaking is analyzed. The designed architecture supports band-folding quasi-bound states in the continuum (QBICs) with magnetic dipole (MD) and electric quadrupole (EQ) as dominant radiative components governing the resonance. It demonstrates outstanding refractive index (RI) sensing capabilities, achieving a baseline sensitivity of 603.75 through its initial geometric configuration. Employing parameter space exploration, we demonstrate a 28.7 % enhancement in sensitivity (S) from baseline to 770.7 through strategic geometric tuning. By implementing a parameter compensation strategy during the QBIC realization process, we successfully decoupled the resonant wavelength from structural asymmetry variations, while maintaining inverse proportionality between the full-width at half-maximum (FWHM) and symmetry-breaking parameters (Δα). Through systematic adjustment of Δα, we achieved a record figure of merit (FOM) exceeding 10⁵ . This work bridges the gap between extreme field localization and spectral stability in BIC-based sensing
{"title":"Band-folding-engineered quasi-BICs in elliptical silicon nanodimers for High-FOM refractive index sensing: Design and optimization","authors":"Qi Wu, Shuo Yang, Shan Wu","doi":"10.1016/j.photonics.2025.101488","DOIUrl":"10.1016/j.photonics.2025.101488","url":null,"abstract":"<div><div>In this work, a metasurface consisting of periodic arrays of asymmetric elliptical bi-silicon cylinders with out-of-plane symmetry breaking is analyzed. The designed architecture supports band-folding quasi-bound states in the continuum (QBICs) with magnetic dipole (MD) and electric quadrupole (EQ) as dominant radiative components governing the resonance. It demonstrates outstanding refractive index (RI) sensing capabilities, achieving a baseline sensitivity of 603.75 <span><math><mrow><mi>nm</mi><mo>∙</mo><msup><mrow><mi>RIU</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span> through its initial geometric configuration. Employing parameter space exploration, we demonstrate a 28.7 % enhancement in sensitivity (S) from baseline to 770.7 <span><math><mrow><mi>nm</mi><mo>∙</mo><msup><mrow><mi>RIU</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span> through strategic geometric tuning. By implementing a parameter compensation strategy during the QBIC realization process, we successfully decoupled the resonant wavelength from structural asymmetry variations, while maintaining inverse proportionality between the full-width at half-maximum (FWHM) and symmetry-breaking parameters (Δα). Through systematic adjustment of Δα, we achieved a record figure of merit (FOM) exceeding 10⁵ <span><math><msup><mrow><mi>RIU</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>. This work bridges the gap between extreme field localization and spectral stability in BIC-based sensing</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"68 ","pages":"Article 101488"},"PeriodicalIF":2.9,"publicationDate":"2025-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145685033","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}
Pub Date : 2025-11-26DOI: 10.1016/j.photonics.2025.101480
Chunyu Li , Elena Petrova , Sabina Bikmetova , Denis V. Danilov , Dmitry Zuev , Eduard Ageev
Self-assembly is an effective instrument for organization of nano- and microparticles to specially designed surface patterns. To obtain the uniform distribution of nano-and microparticles in mask-free self-assembly, the “coffee ring” effect should be carefully avoided. In this study, we propose an approach for effective limitation of such an effect on fused silica surfaces through femtosecond generation of laser-induced periodical surface structures (LIPSS). First, we determine optimal irradiation parameters to provide a higher ratio between LIPSS covered (treated) and untreated surface. Then we study a LIPPS formation in a scanning mode to cover the substrate by LIPSS reducing a contact angle. We demonstrate that scanning laser parameters with frequency of 1 kHz, pulse duration of 270 fs, laser peak fluence of 6.5 J/cm2 and scanning period of 9 µm ensure a high rate of surface wettability adjustment (0.23 mm2/min) with a contact angle of ∼ 9 ± 0.5°. Droplet tests with colloidal solution of polystyrene sub-micron (～900 nm) particles demonstrate that “coffee ring” effect is considerably reduced with more than 50 % particles captured inside laser-scanned lines. The demonstrated results are prospective for creation of various photonic structures and systems through mask-free self-assembly.
{"title":"Modification of wettability on fused silica surface via laser-induced nanostructures for enhanced capture of polystyrene particles","authors":"Chunyu Li , Elena Petrova , Sabina Bikmetova , Denis V. Danilov , Dmitry Zuev , Eduard Ageev","doi":"10.1016/j.photonics.2025.101480","DOIUrl":"10.1016/j.photonics.2025.101480","url":null,"abstract":"<div><div>Self-assembly is an effective instrument for organization of nano- and microparticles to specially designed surface patterns. To obtain the uniform distribution of nano-and microparticles in mask-free self-assembly, the “coffee ring” effect should be carefully avoided. In this study, we propose an approach for effective limitation of such an effect on fused silica surfaces through femtosecond generation of laser-induced periodical surface structures (LIPSS). First, we determine optimal irradiation parameters to provide a higher ratio between LIPSS covered (treated) and untreated surface. Then we study a LIPPS formation in a scanning mode to cover the substrate by LIPSS reducing a contact angle. We demonstrate that scanning laser parameters with frequency of 1 kHz, pulse duration of 270 fs, laser peak fluence of 6.5 J/cm<sup>2</sup> and scanning period of 9 µm ensure a high rate of surface wettability adjustment (0.23 mm<sup>2</sup>/min) with a contact angle of ∼ 9 ± 0.5°. Droplet tests with colloidal solution of polystyrene sub-micron (～900 nm) particles demonstrate that “coffee ring” effect is considerably reduced with more than 50 % particles captured inside laser-scanned lines. The demonstrated results are prospective for creation of various photonic structures and systems through mask-free self-assembly.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"68 ","pages":"Article 101480"},"PeriodicalIF":2.9,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145618404","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}
Pub Date : 2025-11-19DOI: 10.1016/j.photonics.2025.101478
Pengxiang Li, Hao Wang, Zhengrong Tong, Weihua Zhang, Jing Ma
This research presents a novel design framework for photonic crystal fiber surface plasmon resonance (PCF-SPR) sensors, incorporating finite element simulation, machine learning (ML), and multi-objective optimization methodologies. A dataset is produced via numerical simulations, altering essential structural parameters such as big and small hole dimensions, hole spacing, and gold film thickness. A multilayer perceptron (MLP) neural network is created as a surrogate model to swiftly and precisely forecast sensor performance parameters, such as wavelength sensitivity and figure of merit (FOM). The non-dominated sorting genetic algorithm (NSGA-II) is utilized to attain the Pareto optimal frontier, with sensitivity and FOM as dual optimization objectives. The ideal compromise option is subsequently identified with the Technique for Order of Preference by Similarity to Ideal Option (TOPSIS) approach. The optimized PCF-SPR sensor attained a peak sensitivity of 21,172.80 nm/RIU and a FOM of 100.86 , indicating significant performance improvement. This study emphasizes the amalgamation of ML with multi-objective evolutionary algorithms, confirming the practicality and benefits of merging ML with optimization algorithms for the construction of high-performance PCF-SPR sensor architectures.
{"title":"Machine learning-assisted multi-objective optimization of photonic crystal fiber SPR sensors","authors":"Pengxiang Li, Hao Wang, Zhengrong Tong, Weihua Zhang, Jing Ma","doi":"10.1016/j.photonics.2025.101478","DOIUrl":"10.1016/j.photonics.2025.101478","url":null,"abstract":"<div><div>This research presents a novel design framework for photonic crystal fiber surface plasmon resonance (PCF-SPR) sensors, incorporating finite element simulation, machine learning (ML), and multi-objective optimization methodologies. A dataset is produced via numerical simulations, altering essential structural parameters such as big and small hole dimensions, hole spacing, and gold film thickness. A multilayer perceptron (MLP) neural network is created as a surrogate model to swiftly and precisely forecast sensor performance parameters, such as wavelength sensitivity and figure of merit (FOM). The non-dominated sorting genetic algorithm (NSGA-II) is utilized to attain the Pareto optimal frontier, with sensitivity and FOM as dual optimization objectives. The ideal compromise option is subsequently identified with the Technique for Order of Preference by Similarity to Ideal Option (TOPSIS) approach. The optimized PCF-SPR sensor attained a peak sensitivity of 21,172.80 nm/RIU and a FOM of 100.86 <span><math><msup><mrow><mtext>RIU</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>, indicating significant performance improvement. This study emphasizes the amalgamation of ML with multi-objective evolutionary algorithms, confirming the practicality and benefits of merging ML with optimization algorithms for the construction of high-performance PCF-SPR sensor architectures.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"67 ","pages":"Article 101478"},"PeriodicalIF":2.9,"publicationDate":"2025-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579624","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}
Pub Date : 2025-11-19DOI: 10.1016/j.photonics.2025.101477
Vladimir D. Burtsev, Tatyana S. Vosheva, Andrey A. Zarenin, Dmitry S. Filonov
In this work, we present a versatile approach for designing new antennas with predetermined radiation patterns through the indirect solution of the electrodynamics inverse problem. The algorithm is based on the spherical multipolar decomposition of a given radiation pattern and its correlation and decomposition by the basis of other simpler antennas. The proposed technique enables flexible adjustment of the desired far-field distribution, without directly focusing on any other parameters other than the polarization requirements of the communication channel and the spatial distribution of the objects involved in the task. In addition to detailing the algorithm for reconstructing the antenna geometry from its radiation pattern, we provide several examples of using this algorithm. The emitter topologies obtained using this method can be applied both in novel 5G Advanced and 6G communication systems, as well as integrated into existing wireless communication and power transfer lines.
{"title":"From radiation pattern straight to antenna geometry","authors":"Vladimir D. Burtsev, Tatyana S. Vosheva, Andrey A. Zarenin, Dmitry S. Filonov","doi":"10.1016/j.photonics.2025.101477","DOIUrl":"10.1016/j.photonics.2025.101477","url":null,"abstract":"<div><div>In this work, we present a versatile approach for designing new antennas with predetermined radiation patterns through the indirect solution of the electrodynamics inverse problem. The algorithm is based on the spherical multipolar decomposition of a given radiation pattern and its correlation and decomposition by the basis of other simpler antennas. The proposed technique enables flexible adjustment of the desired far-field distribution, without directly focusing on any other parameters other than the polarization requirements of the communication channel and the spatial distribution of the objects involved in the task. In addition to detailing the algorithm for reconstructing the antenna geometry from its radiation pattern, we provide several examples of using this algorithm. The emitter topologies obtained using this method can be applied both in novel 5G Advanced and 6G communication systems, as well as integrated into existing wireless communication and power transfer lines.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"68 ","pages":"Article 101477"},"PeriodicalIF":2.9,"publicationDate":"2025-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145584167","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}
Pub Date : 2025-11-18DOI: 10.1016/j.photonics.2025.101479
Evgeni A. Bezus, Dmitry A. Bykov, Leonid L. Doskolovich
One of the most important properties of diffraction gratings is their ability to direct the incident radiation to a desired diffraction order. Here, we investigate the optical properties of dielectric diffraction gratings separated by a homogeneous layer from a perfect mirror and operating in the Littrow mounting. We obtain closed-form conditions in the form of inequalities imposed on the elements of the scattering matrix of the grating, which are necessary and sufficient for the structure to possess zeros of the 0th or st reflected diffraction orders, i.e., to exhibit perfect retroreflection or perfect specular reflection. We also derive simple sufficient conditions for perfect retroreflection and specular reflection. We show that if both of these conditions are satisfied, the reflector-backed grating also supports bound states in the continuum. The obtained theoretical results are fully confirmed by the results of rigorous electromagnetic simulations.
{"title":"Perfect retroreflection, specular reflection, and bound states in the continuum in reflector-backed diffraction gratings operating in Littrow mounting","authors":"Evgeni A. Bezus, Dmitry A. Bykov, Leonid L. Doskolovich","doi":"10.1016/j.photonics.2025.101479","DOIUrl":"10.1016/j.photonics.2025.101479","url":null,"abstract":"<div><div>One of the most important properties of diffraction gratings is their ability to direct the incident radiation to a desired diffraction order. Here, we investigate the optical properties of dielectric diffraction gratings separated by a homogeneous layer from a perfect mirror and operating in the Littrow mounting. We obtain closed-form conditions in the form of inequalities imposed on the elements of the scattering matrix of the grating, which are necessary and sufficient for the structure to possess zeros of the 0th or <span><math><mrow><mo>−</mo><mn>1</mn></mrow></math></span>st reflected diffraction orders, i.e., to exhibit perfect retroreflection or perfect specular reflection. We also derive simple sufficient conditions for perfect retroreflection and specular reflection. We show that if both of these conditions are satisfied, the reflector-backed grating also supports bound states in the continuum. The obtained theoretical results are fully confirmed by the results of rigorous electromagnetic simulations.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"67 ","pages":"Article 101479"},"PeriodicalIF":2.9,"publicationDate":"2025-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579626","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}
Pub Date : 2025-11-14DOI: 10.1016/j.photonics.2025.101476
Yulia Grigorovich , Sergey Geyman , Ildar Yusupov , Anton Kharchevskii , Irina Melchakova , Pavel Ginzburg , Mikhail Udrov
Accurate localization in relatively small volumes is essential for precisely tracking and managing wireless devices, allowing for detailed control and coordination in robotics, manufacturing, and healthcare applications, where even minor positional errors can significantly affect performance and safety. While high-frequency localization techniques may seem appealing, in many cases with heavy clutter, line-of-sight constraints significantly limit their performance, prompting the use of alternative low-frequency solutions. Here, we leverage the existing and well-established Near-Field Communication (NFC) architecture, widely deployed on consumer wireless devices, to demonstrate an exceptionally accurate localization technique that achieves millimeter-scale precision, even in perspective scenarios where massive objects obstruct the line of sight. The system uses a pair of large-area coils to establish a reliable NFC communication channel over distances of several meters. The position of a device, whether it is a tag or a smartphone equipped with a transceiver module, is determined by balancing the received signal strength, which is then mapped to a specific location in space. The NFC protocol, operating at 13.56 MHz with a corresponding free-space wavelength of 22 meters, exhibits minimal sensitivity to obstacles due to its reliance on near-field interactions rather than free-space propagation. In all demonstrations, millimeter-scale localization accuracy was achieved along a one-dimensional axis. NFC-based localization systems, to some extent serving as a compromise between extremely low-frequency and high-frequency implementations, can offer robust high-precision tracking solutions in environments where traditional methods encounter significant limitations.
{"title":"Long-range NFC device localization with millimeter-scale accuracy","authors":"Yulia Grigorovich , Sergey Geyman , Ildar Yusupov , Anton Kharchevskii , Irina Melchakova , Pavel Ginzburg , Mikhail Udrov","doi":"10.1016/j.photonics.2025.101476","DOIUrl":"10.1016/j.photonics.2025.101476","url":null,"abstract":"<div><div>Accurate localization in relatively small volumes is essential for precisely tracking and managing wireless devices, allowing for detailed control and coordination in robotics, manufacturing, and healthcare applications, where even minor positional errors can significantly affect performance and safety. While high-frequency localization techniques may seem appealing, in many cases with heavy clutter, line-of-sight constraints significantly limit their performance, prompting the use of alternative low-frequency solutions. Here, we leverage the existing and well-established Near-Field Communication (NFC) architecture, widely deployed on consumer wireless devices, to demonstrate an exceptionally accurate localization technique that achieves millimeter-scale precision, even in perspective scenarios where massive objects obstruct the line of sight. The system uses a pair of large-area coils to establish a reliable NFC communication channel over distances of several meters. The position of a device, whether it is a tag or a smartphone equipped with a transceiver module, is determined by balancing the received signal strength, which is then mapped to a specific location in space. The NFC protocol, operating at 13.56 MHz with a corresponding free-space wavelength of 22 meters, exhibits minimal sensitivity to obstacles due to its reliance on near-field interactions rather than free-space propagation. In all demonstrations, millimeter-scale localization accuracy was achieved along a one-dimensional axis. NFC-based localization systems, to some extent serving as a compromise between extremely low-frequency and high-frequency implementations, can offer robust high-precision tracking solutions in environments where traditional methods encounter significant limitations.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"67 ","pages":"Article 101476"},"PeriodicalIF":2.9,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579625","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}
Modern communication technologies have imposed higher demands on optical fiber platform. This work presents a multifunctional all-fiber polarization beam splitter (PBS) using ethanol filled dual-core photonic crystal fiber (DC-PCF) with gold layer by the finite element method (FEM). The simulation results indicate that the gold layer exerts a significant enhancement effect on the polarization difference of this PCF, whereas ethanol endows it with mode field modulation and temperature-tunable property. By satisfying the suitable structural parameter conditions, the device achieves a coupling length ratio (CLR) of 2 at 1.55 μm, resulting in the minimum device length of 318 μm. Through numerical analysis, it can be found that this fiber device is well-adapted for splitting in core A and for temperature sensing in core B. In core A, the extinction ratio reaches −64.21 dB at 1.42 μm and −53.90 dB at 1.57 μm, with a bandwidth of 340 nm. This bandwidth can nearly cover the E + S + C + L + U bands. In core B, the two sensing signals are accurately positioned at 1.31 and 1.55 μm. In the temperature range from 0 to 40 °C, the corresponding sensitivities are 2.4 nm/°C and −1.8 nm/°C, respectively. Simultaneously, they also exhibit good linearity, with linearity values of 0.96396 and 0.98374, respectively. Moreover, this device has a high feasibility. It is believed that this multi-functional in-fiber device with polarization splitting and temperature sensing capabilities will be a key component for the future optical communication.
现代通信技术对光纤平台提出了更高的要求。本文采用有限元方法，提出了一种以含金层的乙醇填充双芯光子晶体光纤（DC-PCF）为材料的多功能全光纤偏振分束器。模拟结果表明，金层对PCF的极化差有明显的增强作用，而乙醇则使其具有模场调制和温度可调的特性。在满足合适的结构参数条件下，器件在1.55 μm处的耦合长度比（CLR）为2，器件最小长度为318 μm。通过数值分析发现，该光纤器件很好地适应了A芯的分裂和b芯的温度传感。在A芯中，消光比在1.42 μm处达到- 64.21 dB，在1.57 μm处达到- 53.90 dB，带宽为340 nm。该带宽几乎可以覆盖E + S + C + L + U波段。在核心B中，两个传感信号精确定位在1.31 μm和1.55 μm。在0 ~ 40℃的温度范围内，对应的灵敏度分别为2.4 nm/℃和−1.8 nm/℃。同时，它们也表现出良好的线性关系，线性值分别为0.96396和0.98374。该装置具有较高的可行性。相信这种具有偏振分裂和温度传感功能的多功能光纤器件将成为未来光通信的关键部件。
{"title":"Numerical simulation of in-fiber polarization beam splitter using ethanol selectively infiltrated gold-coated dual-core photonic crystal fiber and its temperature sensing characteristic","authors":"Yinda Fang , Nan Chen , Wenhui Guo , Leilei Gao , Xin Ding","doi":"10.1016/j.photonics.2025.101471","DOIUrl":"10.1016/j.photonics.2025.101471","url":null,"abstract":"<div><div>Modern communication technologies have imposed higher demands on optical fiber platform. This work presents a multifunctional all-fiber polarization beam splitter (PBS) using ethanol filled dual-core photonic crystal fiber (DC-PCF) with gold layer by the finite element method (FEM). The simulation results indicate that the gold layer exerts a significant enhancement effect on the polarization difference of this PCF, whereas ethanol endows it with mode field modulation and temperature-tunable property. By satisfying the suitable structural parameter conditions, the device achieves a coupling length ratio (CLR) of 2 at 1.55 μm, resulting in the minimum device length of 318 μm. Through numerical analysis, it can be found that this fiber device is well-adapted for splitting in core A and for temperature sensing in core B. In core A, the extinction ratio reaches −64.21 dB at 1.42 μm and −53.90 dB at 1.57 μm, with a bandwidth of 340 nm. This bandwidth can nearly cover the E + S + C + L + U bands. In core B, the two sensing signals are accurately positioned at 1.31 and 1.55 μm. In the temperature range from 0 to 40 °C, the corresponding sensitivities are 2.4 nm/°C and −1.8 nm/°C, respectively. Simultaneously, they also exhibit good linearity, with linearity values of 0.96396 and 0.98374, respectively. Moreover, this device has a high feasibility. It is believed that this multi-functional in-fiber device with polarization splitting and temperature sensing capabilities will be a key component for the future optical communication.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"67 ","pages":"Article 101471"},"PeriodicalIF":2.9,"publicationDate":"2025-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145528392","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}
Owing to its quasi-one-dimensional van der Waals structure and high sensitivity to uniaxial strain, zirconium triselenide (ZrSe3) exhibits significant potential for photonic applications. Notably, this material demonstrates strong optical absorption at ∼1.5 μm, coinciding with the Erbium gain band. Despite these advantages, ZrSe3 remains underexplored in Er-doped fiber lasers. Herein, we fabricate two ZrSe3/PVA nanosheet composites (S1, S2) with distinct volume ratios as saturable absorbers (SAs). Implemented in an Er-doped fiber laser, S1 achieves pure Q-switching operation (12.8 μs pulse width, 37.6 kHz repetition rate), while S2 enables dual Q-switched mode-locking regimes at 12.8 MHz. The pulse width decreases from 686 ps to 633 ps when transitioning from special to conventional Q-switched mode-locking. To our knowledge, this work reports the first demonstration of both special and conventional Q-switched mode-locking using 2D ZrSe₃ SAs in Er-doped fiber lasers, highlighting its promise for ultrafast and nonlinear optics.
{"title":"1.5 μm pulsed fiber lasers based on Zirconium tri-selenide (ZrSe3) nanosheets saturable absorbers","authors":"Ruoyi Zhu, Junpeng Qiao, Ranran Fan, Jiwen Wang, Guangqiang Liu, Sujuan Feng","doi":"10.1016/j.photonics.2025.101472","DOIUrl":"10.1016/j.photonics.2025.101472","url":null,"abstract":"<div><div>Owing to its quasi-one-dimensional van der Waals structure and high sensitivity to uniaxial strain, zirconium triselenide (ZrSe<sub>3</sub>) exhibits significant potential for photonic applications. Notably, this material demonstrates strong optical absorption at ∼1.5 μm, coinciding with the Erbium gain band. Despite these advantages, ZrSe<sub>3</sub> remains underexplored in Er-doped fiber lasers. Herein, we fabricate two ZrSe<sub>3</sub>/PVA nanosheet composites (S1, S2) with distinct volume ratios as saturable absorbers (SAs). Implemented in an Er-doped fiber laser, S1 achieves pure Q-switching operation (12.8 μs pulse width, 37.6 kHz repetition rate), while S2 enables dual Q-switched mode-locking regimes at 12.8 MHz. The pulse width decreases from 686 ps to 633 ps when transitioning from special to conventional Q-switched mode-locking. To our knowledge, this work reports the first demonstration of both special and conventional Q-switched mode-locking using 2D ZrSe₃ SAs in Er-doped fiber lasers, highlighting its promise for ultrafast and nonlinear optics.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"67 ","pages":"Article 101472"},"PeriodicalIF":2.9,"publicationDate":"2025-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145528438","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}
Pub Date : 2025-11-09DOI: 10.1016/j.photonics.2025.101474
Yuxiang Zhang , Xinyu Cao , Hongling Guo , Meixuan Li , Yue Hong , Qian Zhang , Yinghan Bi , Shuoyuan Gu , Chunchen Zhang , Shifu Xiong
The notch filter is a critical component in fluorescence endoscope imaging systems, where its performance directly governs image quality. However, achieving simultaneous deep rejection bandwidth, minimal passband ripple, and superior surface flatness presents significant design challenges. Here, this work regulates the coefficients of high/low refractive index materials based on Chebyshev polynomial theory. Combines optical film theory, Essential Macleod software, and half-wave hole effect to complete the optimization of the film system. Based on this systematic investigation, the device prepared by physical vapor deposition achieves average transmittances of 93.31 % and 94.51 % in the 430–680 nm and 835–870 nm bands, respectively, and reaches an average OD8.01 (minimum OD6.10) in the 700–820 nm blocking band, with a reflected wavefront RMS of 0.055λ (λ = 632.8 nm, approximately λ/18). These results indicate that our devices exhibit high transmission characteristics in the visible light and fluorescence emission bands, achieves deep blocking in the excitation band, and possesses excellent reflected surface figure quality. This work provides an effective solution for developing deep-cutoff notch filters in the field of biomedical imaging.
{"title":"Investigation into deep-cutoff notch filters for fluorescence endoscope imaging","authors":"Yuxiang Zhang , Xinyu Cao , Hongling Guo , Meixuan Li , Yue Hong , Qian Zhang , Yinghan Bi , Shuoyuan Gu , Chunchen Zhang , Shifu Xiong","doi":"10.1016/j.photonics.2025.101474","DOIUrl":"10.1016/j.photonics.2025.101474","url":null,"abstract":"<div><div>The notch filter is a critical component in fluorescence endoscope imaging systems, where its performance directly governs image quality. However, achieving simultaneous deep rejection bandwidth, minimal passband ripple, and superior surface flatness presents significant design challenges. Here, this work regulates the coefficients of high/low refractive index materials based on Chebyshev polynomial theory. Combines optical film theory, Essential Macleod software, and half-wave hole effect to complete the optimization of the film system. Based on this systematic investigation, the device prepared by physical vapor deposition achieves average transmittances of 93.31 % and 94.51 % in the 430–680 nm and 835–870 nm bands, respectively, and reaches an average OD8.01 (minimum OD6.10) in the 700–820 nm blocking band, with a reflected wavefront RMS of 0.055λ (λ = 632.8 nm, approximately λ/18). These results indicate that our devices exhibit high transmission characteristics in the visible light and fluorescence emission bands, achieves deep blocking in the excitation band, and possesses excellent reflected surface figure quality. This work provides an effective solution for developing deep-cutoff notch filters in the field of biomedical imaging.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"67 ","pages":"Article 101474"},"PeriodicalIF":2.9,"publicationDate":"2025-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145528393","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}
Pub Date : 2025-11-07DOI: 10.1016/j.photonics.2025.101473
Yufan Ye , Tianyi Xu , Haonan Wu , Yinyin Wang , Jinyun Zhou , Jiancai Xue
Bound states in the continuum (BICs) in hybrid photonic-plasmonic nanostructures enable both exceptionally high quality (Q) factors and strong light field enhancements, holding promising potential for applications ranging from lasing to sensing and nonlinear devices. For their further development in functional applications, it is crucial to achieve tunability in BIC responses. Here, we propose a switchable hybrid photonic-plasmonic BIC platform comprising an anisotropic plasmonic lattice embedded in a Fabry-Perot (FP) cavity. These BIC modes arise from the coupling between the plasmonic resonances of the lattice array and the guided modes in the FP cavity, bringing about both compact light confinement and high Q factors. The anisotropic configuration enables four distinct sets of BIC modes with different resonance wavelengths, which can be switched by changing the incident conditions, namely the polarization directions and transverse electric (TE)/transverse magnetic (TM) polarizations. Such a switchable BIC platform provides valuable tunability for the functionalization of BIC-based nanodevices.
{"title":"Switchable bound states in the continuum in hybrid photonic-plasmonic nanostructure based on an anisotropic lattice in Fabry-Perot cavity","authors":"Yufan Ye , Tianyi Xu , Haonan Wu , Yinyin Wang , Jinyun Zhou , Jiancai Xue","doi":"10.1016/j.photonics.2025.101473","DOIUrl":"10.1016/j.photonics.2025.101473","url":null,"abstract":"<div><div>Bound states in the continuum (BICs) in hybrid photonic-plasmonic nanostructures enable both exceptionally high quality (Q) factors and strong light field enhancements, holding promising potential for applications ranging from lasing to sensing and nonlinear devices. For their further development in functional applications, it is crucial to achieve tunability in BIC responses. Here, we propose a switchable hybrid photonic-plasmonic BIC platform comprising an anisotropic plasmonic lattice embedded in a Fabry-Perot (FP) cavity. These BIC modes arise from the coupling between the plasmonic resonances of the lattice array and the guided modes in the FP cavity, bringing about both compact light confinement and high Q factors. The anisotropic configuration enables four distinct sets of BIC modes with different resonance wavelengths, which can be switched by changing the incident conditions, namely the polarization directions and transverse electric (TE)/transverse magnetic (TM) polarizations. Such a switchable BIC platform provides valuable tunability for the functionalization of BIC-based nanodevices.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"67 ","pages":"Article 101473"},"PeriodicalIF":2.9,"publicationDate":"2025-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145474914","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}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号