CMOS technologies can provide miniature filters with few-nm passband in the visible, much suited to on-chip spectrometers and hyperspectral imaging. However, crosstalk can become challenging and degrade spectral retrieval at the smallest sizes. A filter/metasurface bank design is a first demanding step for this scope, playing with in-plane patterns/“atoms”. For a miniature device of 10–100 small pixels, each 1–3 μm wide, the filters finite extent incurs an extra penalty: cross-talk between neighbor pixels, hard to minimize through electromagnetic tools. A distinct and useful minimization suited to the CMOS context is then to select the arrangement of N filters on the array to privilege the less penalizing neighbor pairs. This amounts to a path selection problem in the N×(N−1) space of the inter-micro-filter cross-talks. We evaluate the resulting benefit in terms of the condition number of the system’s spectral function matrix, the basic ingredient for spectral retrieval. In one dimension, we find that small arrays can be tackled by brute force up to N∼15 filters, but a minimization through a simply weighted proxy, a summed cross-talk combination, is more advantageous beyond. In two-dimensions, the topology only partly changes the trend. Relevant examples of infinite and finite filters based on amorphous silicon and silica are also provided to justify the choice of a rather broad cross-talk distribution in the inter-filter space. Gains of c−1∕〈c−1〉=1.5–2.5 on the inverse of the condition number c (and thus the accuracy of spectral retrieval) emerge from the study.
{"title":"Optimization strategy of ultra-compact metasurface-based filter ordering on sensors for improved spectral retrieval","authors":"Trideeb Bhattacharya , Marie-Anne Burcklen , Mathilde Larché , Mondher Besbes , S. Ram Prakash , Stéphane Monfray , Henri Benisty","doi":"10.1016/j.photonics.2025.101409","DOIUrl":"10.1016/j.photonics.2025.101409","url":null,"abstract":"<div><div>CMOS technologies can provide miniature filters with few-nm passband in the visible, much suited to on-chip spectrometers and hyperspectral imaging. However, crosstalk can become challenging and degrade spectral retrieval at the smallest sizes. A filter/metasurface bank design is a first demanding step for this scope, playing with in-plane patterns/“atoms”. For a miniature device of 10–100 small pixels, each 1–3 <em>μ</em>m wide, the filters finite extent incurs an extra penalty: cross-talk between neighbor pixels, hard to minimize through electromagnetic tools. A distinct and useful minimization suited to the CMOS context is then to select the arrangement of <em>N</em> filters on the array to privilege the less penalizing neighbor pairs. This amounts to a path selection problem in the <em>N</em>×(<em>N</em>−1) space of the inter-micro-filter cross-talks. We evaluate the resulting benefit in terms of the condition number of the system’s spectral function matrix, the basic ingredient for spectral retrieval. In one dimension, we find that small arrays can be tackled by brute force up to <em>N</em>∼15 filters, but a minimization through a simply weighted proxy, a summed cross-talk combination, is more advantageous beyond. In two-dimensions, the topology only partly changes the trend. Relevant examples of infinite and finite filters based on amorphous silicon and silica are also provided to justify the choice of a rather broad cross-talk distribution in the inter-filter space. Gains of <em>c</em><sup>−1</sup>∕〈<em>c</em><sup>−1</sup>〉=1.5–2.5 on the inverse of the condition number <em>c</em> (and thus the accuracy of spectral retrieval) emerge from the study.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"66 ","pages":"Article 101409"},"PeriodicalIF":2.5,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263312","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 : 2025-06-03DOI: 10.1016/j.photonics.2025.101408
Alexey Zhizhchenko , Artem Cherepakhin , Eugeny Mitsai , Xiaoqiang Li , Xianshao Zou , Yuri Mezenov , Aleksandr A. Kuchmizhak , Sergey Makarov
Laser ablation of halide perovskites is a powerful tool for precise nanopatterning and formation of various nanophotonic designs supporting unique optical properties or lasing. In this study, we investigate the polarization-dependent effects in femtosecond laser ablation of halide perovskites, providing experimental evidence of their non-symmetrical nanostructuring. Through systematic analysis supported by optical simulations, we demonstrate that the shape of the ablated craters evolving under multi-pulse irradiation exhibits a pronounced dependence on the laser polarization, leading to anisotropic material removal. Our simulations and experiments also reveal that the asymmetric energy deposition due to local redistribution of the absorbed laser energy profile plays a critical role during surface scanning by the laser beam, affecting the resulting track morphology. As a result, we justify the optimal nanostructuring regimes allowing the quasi-uniform and gear-shaped perovskite microdisks to imprint upon them supporting low-threshold lasing upon optical excitation. Our findings provide new insights into laser-matter interactions in halide perovskites and open possibilities for controlled laser nanostructuring of optoelectronic materials.
{"title":"Polarization-dependent direct laser nanostructuring of halide perovskites","authors":"Alexey Zhizhchenko , Artem Cherepakhin , Eugeny Mitsai , Xiaoqiang Li , Xianshao Zou , Yuri Mezenov , Aleksandr A. Kuchmizhak , Sergey Makarov","doi":"10.1016/j.photonics.2025.101408","DOIUrl":"10.1016/j.photonics.2025.101408","url":null,"abstract":"<div><div>Laser ablation of halide perovskites is a powerful tool for precise nanopatterning and formation of various nanophotonic designs supporting unique optical properties or lasing. In this study, we investigate the polarization-dependent effects in femtosecond laser ablation of halide perovskites, providing experimental evidence of their non-symmetrical nanostructuring. Through systematic analysis supported by optical simulations, we demonstrate that the shape of the ablated craters evolving under multi-pulse irradiation exhibits a pronounced dependence on the laser polarization, leading to anisotropic material removal. Our simulations and experiments also reveal that the asymmetric energy deposition due to local redistribution of the absorbed laser energy profile plays a critical role during surface scanning by the laser beam, affecting the resulting track morphology. As a result, we justify the optimal nanostructuring regimes allowing the quasi-uniform and gear-shaped perovskite microdisks to imprint upon them supporting low-threshold lasing upon optical excitation. Our findings provide new insights into laser-matter interactions in halide perovskites and open possibilities for controlled laser nanostructuring of optoelectronic materials.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"66 ","pages":"Article 101408"},"PeriodicalIF":2.5,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241074","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 : 2025-05-30DOI: 10.1016/j.photonics.2025.101405
Renat Sh. Ikhsanov , Igor V. Smetanin , Igor E. Protsenko , Alexander V. Uskov
A model has been developed to calculate the Tamm quasi-level in metal-semiconductor structures with Schottky barrier. The model was used to show that electron resonance tunneling from metal to semiconductor through the Schottky barrier can occur with the Tamm quasi-level at the metal-semiconductor interface. The resonance tunneling with the Tamm quasi-level can strongly affect the electron photoemission in plasmonic structures from the metal to the surrounding semiconductor, lowering the red limit of the photoeffect and significantly increasing the internal quantum efficiency of photoemission and the quantum yield of hot carrier generation in plasmonic structures, especially for photochemistry (photocatalysis).
{"title":"Effects of Tamm state on electron tunneling through Schottky barrier and on bulk electron photoemission in metal-semiconductor nanostructures","authors":"Renat Sh. Ikhsanov , Igor V. Smetanin , Igor E. Protsenko , Alexander V. Uskov","doi":"10.1016/j.photonics.2025.101405","DOIUrl":"10.1016/j.photonics.2025.101405","url":null,"abstract":"<div><div>A model has been developed to calculate the Tamm quasi-level in metal-semiconductor structures with Schottky barrier. The model was used to show that electron resonance tunneling from metal to semiconductor through the Schottky barrier can occur with the Tamm quasi-level at the metal-semiconductor interface. The resonance tunneling with the Tamm quasi-level can strongly affect the electron photoemission in plasmonic structures from the metal to the surrounding semiconductor, lowering the red limit of the photoeffect and significantly increasing the internal quantum efficiency of photoemission and the quantum yield of hot carrier generation in plasmonic structures, especially for photochemistry (photocatalysis).</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101405"},"PeriodicalIF":2.5,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144196188","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 : 2025-05-30DOI: 10.1016/j.photonics.2025.101406
Narjes Kheirabadi , YuanDong Wang
The Berry curvature dipole is well-known to cause Hall conductivity. This study expands on previous results to demonstrate how two- and three-dimensional materials react under a tilted magnetic field in the linear and nonlinear regimes. We show how the Hall effect has a quantum origin by deriving the general form of intrinsic and extrinsic currents in materials under a tilted magnetic field. Our focus is on determining the linear and nonlinear response of two-dimensional materials. We also demonstrate that as a result of the perpendicular component of the magnetic field, a current originating from both velocity and Berry curvature can occur in two-dimensional materials and topological crystalline insulators in second harmonic generation and ratchet responses. The findings of this research may provide insight into the transport characteristics of materials in the semi-classical regime and the linear and nonlinear Hall effects.
{"title":"General solution for the response of materials under radiation and tilted magnetic field: Semi-classical regime","authors":"Narjes Kheirabadi , YuanDong Wang","doi":"10.1016/j.photonics.2025.101406","DOIUrl":"10.1016/j.photonics.2025.101406","url":null,"abstract":"<div><div>The Berry curvature dipole is well-known to cause Hall conductivity. This study expands on previous results to demonstrate how two- and three-dimensional materials react under a tilted magnetic field in the linear and nonlinear regimes. We show how the Hall effect has a quantum origin by deriving the general form of intrinsic and extrinsic currents in materials under a tilted magnetic field. Our focus is on determining the linear and nonlinear response of two-dimensional materials. We also demonstrate that as a result of the perpendicular component of the magnetic field, a current originating from both velocity and Berry curvature can occur in two-dimensional materials and topological crystalline insulators in second harmonic generation and ratchet responses. The findings of this research may provide insight into the transport characteristics of materials in the semi-classical regime and the linear and nonlinear Hall effects.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"66 ","pages":"Article 101406"},"PeriodicalIF":2.5,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212809","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 : 2025-05-30DOI: 10.1016/j.photonics.2025.101403
K. Hasanirokh , E.B. AL , A.T. Tuzemen , M. Sayrac , H. Sayrac , F. Ungan
Through this theoretical investigation, we examine the role of various factors (electric field, magnetic field and intense laser field) on GaAs/GaAlAs quantum well with modified Lennard-Jones potential and their influence on the nonlinear optical rectification, second harmonic generation, and third harmonic generation. First, we calculate the wave functions and energy levels for the four lowest confined states in the structure by solving the Schrödinger equation via the diagonalization method in the framework of the effective mass and parabolic band approximations. The optical calculations utilize the density matrix formalism and the iterative method to express the different degrees of dielectric susceptibility. The intense laser effects on the system are calculated via the Floquet method, which modifies the confinement potential due to the heterostructure. The major outcomes of this quantitative research demonstrate a strong dependence between the mentioned parameters and optical properties. Magnetic field, electric field, intense laser field and potential change drastically the energy levels and matrix elements and thus modifies the optical characteristics. By appropriately manipulating the variables we can not only regulate the optical properties of the quantum well but also help developers in the creation of novel optoelectronic devices.
{"title":"Investigation of nonlinear optical properties in GaAs/GaAlAs quantum well with modified Lennard-Jones potential: Role of static electromagnetic fields, intense laser radiation and structure parameters","authors":"K. Hasanirokh , E.B. AL , A.T. Tuzemen , M. Sayrac , H. Sayrac , F. Ungan","doi":"10.1016/j.photonics.2025.101403","DOIUrl":"10.1016/j.photonics.2025.101403","url":null,"abstract":"<div><div>Through this theoretical investigation, we examine the role of various factors (electric field, magnetic field and intense laser field) on GaAs/GaAlAs quantum well with modified Lennard-Jones potential and their influence on the nonlinear optical rectification, second harmonic generation, and third harmonic generation. First, we calculate the wave functions and energy levels for the four lowest confined states in the structure by solving the Schrödinger equation via the diagonalization method in the framework of the effective mass and parabolic band approximations. The optical calculations utilize the density matrix formalism and the iterative method to express the different degrees of dielectric susceptibility. The intense laser effects on the system are calculated via the Floquet method, which modifies the confinement potential due to the heterostructure. The major outcomes of this quantitative research demonstrate a strong dependence between the mentioned parameters and optical properties. Magnetic field, electric field, intense laser field and potential change drastically the energy levels and matrix elements and thus modifies the optical characteristics. By appropriately manipulating the variables we can not only regulate the optical properties of the quantum well but also help developers in the creation of novel optoelectronic devices.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101403"},"PeriodicalIF":2.5,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144196187","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 : 2025-05-29DOI: 10.1016/j.photonics.2025.101404
Victor K. Pustovalov
Solar collectors (absorbers) in which the solar radiation energy is absorbed by liquid working body have been presented in the end of previous century. Optics of pure water and water-based liquids were analyzed for the purpose of their use in solar absorber, but their absorptive properties are not enough to achieve high efficiency of absorbers. After that, various nanoparticles (nanostructures) were used to increase the absortive properies of working liquid absorbers and their optical properties of nanoparticles immersed in water were discussed. Unfortunately, the temperature range in which absorbers with liquid working fluid operate is limited to a value of no more ∼400 K, which, in turn, limits the efficiency of the absorbers. Solid based solar absorbers in which the solar radiation energy is absorbed by solid working body (glass, cermets, ceramics, etc.) have been offered recently. The use of solid-state solar absorbers based on thermal stable solid materials such as glass, ceramics or cermets expands their operating temperature range to 1000 K and more, thereby increasing the efficiency of solar energy collection and opening up the possibility of using high-temperature processes. The optical properties of pure glass and ceramics-based materials are analyzed and the need to use additional absorbers like nanostructures are analyzed. The results of comparative analysis of the influence of optical properties of various metallic and other nanoparticles depending on their material and thermo-optical parameters, solar radiation characteristics and parameters of various hosts (water, glass, Perlucor ceramics) are presented, allowing to select their parameters for increasing the efficiency of solar absorption. Particular interest was shown in the optical absorption properties of homogeneous Ti, Ni nanoparticles in the range of 50–125 nm radii, embedded in silica glass, and they showed the corresponding properties for efficient absorption of solar radiation in the wavelength spectrum of 200–2500 nm. The high temperature stability and efficiency enhancement of solid-state nanostructured materials are significantly higher compared to traditional liquid absorbers, especially taking into account the unique optical properties of Ti/Ni nanoparticles in glass or ceramics. Applications of solid-state solar collectors, thermal energy storage devices, air collectors, as well as solar distillers and desalinators, containing nanoparticles, in various fields are analyzed. Moreover, the high temperature up to thousands of kelvins realized in solid absorbers allows implementing various subsequent high-temperature processes for using the absorbed solar energy. The unique performance advantages of solid absorbers are confirmed by significant achievements currently available. The development and future application of high-temperature nanostructured solid-state solar absorbers promise perspective future effective achievements in different areas.
{"title":"Solid nanostructured materials and solar collectors for efficient absorption of intense solar radiation and their application","authors":"Victor K. Pustovalov","doi":"10.1016/j.photonics.2025.101404","DOIUrl":"10.1016/j.photonics.2025.101404","url":null,"abstract":"<div><div>Solar collectors (absorbers) in which the solar radiation energy is absorbed by liquid working body have been presented in the end of previous century. Optics of pure water and water-based liquids were analyzed for the purpose of their use in solar absorber, but their absorptive properties are not enough to achieve high efficiency of absorbers. After that, various nanoparticles (nanostructures) were used to increase the absortive properies of working liquid absorbers and their optical properties of nanoparticles immersed in water were discussed. Unfortunately, the temperature range in which absorbers with liquid working fluid operate is limited to a value of no more ∼400 K, which, in turn, limits the efficiency of the absorbers. Solid based solar absorbers in which the solar radiation energy is absorbed by solid working body (glass, cermets, ceramics, etc.) have been offered recently. The use of solid-state solar absorbers based on thermal stable solid materials such as glass, ceramics or cermets expands their operating temperature range to 1000 K and more, thereby increasing the efficiency of solar energy collection and opening up the possibility of using high-temperature processes. The optical properties of pure glass and ceramics-based materials are analyzed and the need to use additional absorbers like nanostructures are analyzed. The results of comparative analysis of the influence of optical properties of various metallic and other nanoparticles depending on their material and thermo-optical parameters, solar radiation characteristics and parameters of various hosts (water, glass, Perlucor ceramics) are presented, allowing to select their parameters for increasing the efficiency of solar absorption. Particular interest was shown in the optical absorption properties of homogeneous Ti, Ni nanoparticles in the range of 50–125 nm radii, embedded in silica glass, and they showed the corresponding properties for efficient absorption of solar radiation in the wavelength spectrum of 200–2500 nm. The high temperature stability and efficiency enhancement of solid-state nanostructured materials are significantly higher compared to traditional liquid absorbers, especially taking into account the unique optical properties of Ti/Ni nanoparticles in glass or ceramics. Applications of solid-state solar collectors, thermal energy storage devices, air collectors, as well as solar distillers and desalinators, containing nanoparticles, in various fields are analyzed. Moreover, the high temperature up to thousands of kelvins realized in solid absorbers allows implementing various subsequent high-temperature processes for using the absorbed solar energy. The unique performance advantages of solid absorbers are confirmed by significant achievements currently available. The development and future application of high-temperature nanostructured solid-state solar absorbers promise perspective future effective achievements in different areas.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101404"},"PeriodicalIF":2.5,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189808","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 : 2025-05-29DOI: 10.1016/j.photonics.2025.101407
Ying Cui, Xueyan Han, Jianguo Lei, Aohan Zhang, Xiaozhe Lu
Dual-functional dichroic devices hold great potential applications in optical integrated systems, but most chiral devices are designed for a specific function of circular or linear dichroism (CD or LD). Herein, we numerically demonstrated a dichroic metasurface with giant and reversible CD and LD simultaneously by controlling the phase transition of Ge2Sb2Se4Te1(GSST) in a U-shaped array. By changing the symmetry of the structure via dynamically controlling the states of GSST inclusions, the maximum tuning ranges of CD of −0.89 to 0.89 and LD of −0.85 to 0.92 are achieved in the near-infrared (NIR) band. Theoretical analysis shows that the giant CD originates from the circular polarization selective excitations of magnetic dipole-electric quadrupole (MD-EQ) resonance, and the dual-band LD originates from the linear polarization selective excitations of MD-EQ and toroidal dipole (TD) resonances. To our knowledge, this is the first NIR metasurface capable of large-range switchable CD and LD simultaneously, which may provide new ideas for the design of polarization integrated devices.
{"title":"Dual-functional reconfigurable metasurface for reversible circular and linear dichroism","authors":"Ying Cui, Xueyan Han, Jianguo Lei, Aohan Zhang, Xiaozhe Lu","doi":"10.1016/j.photonics.2025.101407","DOIUrl":"10.1016/j.photonics.2025.101407","url":null,"abstract":"<div><div>Dual-functional dichroic devices hold great potential applications in optical integrated systems, but most chiral devices are designed for a specific function of circular or linear dichroism (CD or LD). Herein, we numerically demonstrated a dichroic metasurface with giant and reversible CD and LD simultaneously by controlling the phase transition of Ge<sub>2</sub>Sb<sub>2</sub>Se<sub>4</sub>Te<sub>1</sub>(GSST) in a U-shaped array. By changing the symmetry of the structure via dynamically controlling the states of GSST inclusions, the maximum tuning ranges of CD of −0.89 to 0.89 and LD of −0.85 to 0.92 are achieved in the near-infrared (NIR) band. Theoretical analysis shows that the giant CD originates from the circular polarization selective excitations of magnetic dipole-electric quadrupole (MD-EQ) resonance, and the dual-band LD originates from the linear polarization selective excitations of MD-EQ and toroidal dipole (TD) resonances. To our knowledge, this is the first NIR metasurface capable of large-range switchable CD and LD simultaneously, which may provide new ideas for the design of polarization integrated devices.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101407"},"PeriodicalIF":2.5,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189804","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 : 2025-05-23DOI: 10.1016/j.photonics.2025.101402
Zefa Sun, Yang Li, ShenWei Yin, Yu Mao, Yi Zhou, Zhixiang Tang
Metasurfaces empowered by quasi-BICs (q-BICs) have been widely employed to enhance chiral optical responses and enable sensing; however, studies that integrate both functionalities within a single design remain limited. In this work, we design a planar q-BIC chiral metasurface consisting of tilted TiO2 bars with off-center inner holes, placed on a SiO2 substrate and coated with polymethyl methacrylate (PMMA). Numerical simulations demonstrate that this design presents near-perfect circular dichroism (CD>0.99). Beyond exhibiting strong chirality, refractive index sensing with a sensitivity of 75.8 nm/RIU and a remarkable nonlinear CD approaching 1 are achieved with the same metasurface. These findings may provide a versatile platform for applications such as chiral laser generation, precision chiral sensing, and nonlinear optical filtering.
{"title":"Design and applications of a metasurface supporting chiral quasi-bound state in the continuum: Refractive index sensing and nonlinear harmonic generation","authors":"Zefa Sun, Yang Li, ShenWei Yin, Yu Mao, Yi Zhou, Zhixiang Tang","doi":"10.1016/j.photonics.2025.101402","DOIUrl":"10.1016/j.photonics.2025.101402","url":null,"abstract":"<div><div>Metasurfaces empowered by quasi-BICs (q-BICs) have been widely employed to enhance chiral optical responses and enable sensing; however, studies that integrate both functionalities within a single design remain limited. In this work, we design a planar q-BIC chiral metasurface consisting of tilted TiO<sub>2</sub> bars with off-center inner holes, placed on a SiO<sub>2</sub> substrate and coated with polymethyl methacrylate (PMMA). Numerical simulations demonstrate that this design presents near-perfect circular dichroism (CD>0.99). Beyond exhibiting strong chirality, refractive index sensing with a sensitivity of 75.8 nm/RIU and a remarkable nonlinear CD approaching 1 are achieved with the same metasurface. These findings may provide a versatile platform for applications such as chiral laser generation, precision chiral sensing, and nonlinear optical filtering.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101402"},"PeriodicalIF":2.5,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167838","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}
Graphene has been actively explored for on-chip nanoscale light sources, due to its small size, high brightness and fast-modulating blackbody radiation sources. However, the productivity problem is that the fabrication processes require a transfer process when mechanically exfoliated or chemical vapor deposited graphene are used, resulting in low productivity and degradation of graphene quality. Here, we fabricated a graphene-based thermal light emitter by using an etching-precipitation method that does not require the transfer process. Infrared and visible light emission was observed from the central constricted area, forming a hot spot. Raman measurements confirmed that defect healing occurred in the central hot spot of graphene due to the annealing effect caused by Joule heating. We also demonstrated that the device has long-term luminescence stability. This light emitter provides a promising avenue for the advancement of on-chip graphene light emitters.
{"title":"Thermal light emitters based on graphene directly grown on chips by etching-precipitation method","authors":"Yui Shimura , Shinichiro Matano , Jumpei Yamada , Suguru Noda , Hideyuki Maki","doi":"10.1016/j.photonics.2025.101400","DOIUrl":"10.1016/j.photonics.2025.101400","url":null,"abstract":"<div><div>Graphene has been actively explored for on-chip nanoscale light sources, due to its small size, high brightness and fast-modulating blackbody radiation sources. However, the productivity problem is that the fabrication processes require a transfer process when mechanically exfoliated or chemical vapor deposited graphene are used, resulting in low productivity and degradation of graphene quality. Here, we fabricated a graphene-based thermal light emitter by using an etching-precipitation method that does not require the transfer process. Infrared and visible light emission was observed from the central constricted area, forming a hot spot. Raman measurements confirmed that defect healing occurred in the central hot spot of graphene due to the annealing effect caused by Joule heating. We also demonstrated that the device has long-term luminescence stability. This light emitter provides a promising avenue for the advancement of on-chip graphene light emitters.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101400"},"PeriodicalIF":2.5,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124345","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 : 2025-05-15DOI: 10.1016/j.photonics.2025.101401
Kang-Hyok O, Kwang-Hyon Kim
For implementation of large-scale quantum computation, we need on-chip single photon sources compatible with integrated photonic circuits. In particular, robustness of topological photonic systems against structural defects or disorder enables us to obtain reliable operations of photonic devices. In this work, we present a robust single photon source based on the resonant excitation of an InAs/GaAs quantum dot embedded in topological coupled cavity-waveguide system. The emission dynamics of the system is investigated by numerically solving master equation for reduced density matrix of effective cavity quantum electrodynamics system. The results show that single photons can be generated with a purity of about 0.8 and a source brightness of around 11 % under resonant excitation. Compared with non-topological system, the proposed topological source exhibits the single photon emission immune to structural defects. Such a robustness of emission performance is the key advantage of the proposed system over non-topological ones, offering practical applicability for quantum technology.
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