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.
{"title":"Robust single photon generation in topological coupled cavity-waveguide QED system","authors":"Kang-Hyok O, Kwang-Hyon Kim","doi":"10.1016/j.photonics.2025.101401","DOIUrl":"10.1016/j.photonics.2025.101401","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101401"},"PeriodicalIF":2.5,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083709","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.2025.101396
Shengmei Ou , Jiakang Xu , Jiming Wang , Yulian Zhu , Xiaorong Gu , Tong Wu , Youwen Liu
Deep learning, in comparison to traditional optimization algorithms, offers significant advantages in addressing complex problems involving multi-dimensional design parameters for the customization of three-dimensional focal fields. In this paper, we present a design method that combines Richards-Wolf vector diffraction theory and neural network techniques for achieving the customization of different focal fields. We utilize a Physics-Connected Neural Network (PCNN) to devise a discrete filter with 25 rings for guiding the structure of the all-dielectric metalens, thereby facilitating the inverse design of optical needles, optical tubes, and flat-top light fields with an extended focal depth (>10λ). The results demonstrate that when combined with a physical model, the neural network effectively adapts to diverse design objectives, reduces design complexity, and improves the efficiency of the design process.
{"title":"Deep learning-assisted focus engineering for metalens design with high numerical aperture cylindrical vector beams","authors":"Shengmei Ou , Jiakang Xu , Jiming Wang , Yulian Zhu , Xiaorong Gu , Tong Wu , Youwen Liu","doi":"10.1016/j.photonics.2025.101396","DOIUrl":"10.1016/j.photonics.2025.101396","url":null,"abstract":"<div><div>Deep learning, in comparison to traditional optimization algorithms, offers significant advantages in addressing complex problems involving multi-dimensional design parameters for the customization of three-dimensional focal fields. In this paper, we present a design method that combines Richards-Wolf vector diffraction theory and neural network techniques for achieving the customization of different focal fields. We utilize a Physics-Connected Neural Network (PCNN) to devise a discrete filter with 25 rings for guiding the structure of the all-dielectric metalens, thereby facilitating the inverse design of optical needles, optical tubes, and flat-top light fields with an extended focal depth (>10<em>λ</em>). The results demonstrate that when combined with a physical model, the neural network effectively adapts to diverse design objectives, reduces design complexity, and improves the efficiency of the design process.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101396"},"PeriodicalIF":2.5,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144098751","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}
We report a theoretical prediction of Dyakonov surface waveguide modes that propagate along a flat strip interfacial waveguide formed by two anisotropic materials, bounded by metal on one side and air on the other. We demonstrate that due to asymmetric metal/air boundary conditions, surface waves can exist in such a system regardless of the type of optical anisotropy. The asymmetric waveguide with negative anisotropy supports a strongly localized solution, whereas in the case of positive anisotropy, the mode intensity decays slowly with distance from the interface. We also analyze the dispersion and field structure of these waves using perturbation theory in the approximation of weak anisotropy. We demonstrate that, irrespective of the type of optical anisotropy, Dyakonov surface waveguide modes exhibit a high degree of circular polarization, reaching values of ±1 at certain distances from the boundaries. Our results are consistent with numerical simulations using the finite element method. We believe this work opens new opportunities for the experimental investigation of Dyakonov surface waves and their practical applications.
{"title":"Dyakonov surface waveguide modes in asymmetric interfacial strip waveguide","authors":"D.A. Chermoshentsev , O.V. Borovkova , I.I. Stepanov , I.A. Bilenko , N.A. Gippius , S.A. Dyakov","doi":"10.1016/j.photonics.2025.101397","DOIUrl":"10.1016/j.photonics.2025.101397","url":null,"abstract":"<div><div>We report a theoretical prediction of Dyakonov surface waveguide modes that propagate along a flat strip interfacial waveguide formed by two anisotropic materials, bounded by metal on one side and air on the other. We demonstrate that due to asymmetric metal/air boundary conditions, surface waves can exist in such a system regardless of the type of optical anisotropy. The asymmetric waveguide with negative anisotropy supports a strongly localized solution, whereas in the case of positive anisotropy, the mode intensity decays slowly with distance from the interface. We also analyze the dispersion and field structure of these waves using perturbation theory in the approximation of weak anisotropy. We demonstrate that, irrespective of the type of optical anisotropy, Dyakonov surface waveguide modes exhibit a high degree of circular polarization, reaching values of ±1 at certain distances from the boundaries. Our results are consistent with numerical simulations using the finite element method. We believe this work opens new opportunities for the experimental investigation of Dyakonov surface waves and their practical applications.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101397"},"PeriodicalIF":2.5,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071928","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 : 2025-05-13DOI: 10.1016/j.photonics.2025.101399
Taha Sheheryar , Ye Tian , Bo Lv , Lei Gao
Despite notable progress, many existing terahertz biosensors rely on expensive materials like noble metals or 2D nanomaterials and are typically restricted to detecting specific biomarkers or single diseases, which limits their specificity, adaptability and real-world clinical utility. This work addresses these limitations by proposing a cost-effective, scalable refractive index based metasurface biosensor design that is composed of Aluminum and Polyimide. Through a dual-resonance mechanism, the sensor captures minute dielectric variations linked to multiple diseases including cancers such as breast, blood and cervical, as well as blood related infections like malaria. Under optimized simulation conditions, the sensor shows a high-Quality Factor exceeding 200, a Figure of Merit of 63.68 RIU⁻¹ and a sensitivity of 3.107 THz/RIU. Beyond its strong performance metrics, the sensor provides a cost-effective and non-invasive detection platform that seamlessly integrates simplicity, adaptability to multiple diseases and high diagnostic precision, advancing the field of early, rapid and accessible diagnostics across a wide range of biomedical applications, especially in resource limited settings.
{"title":"High-sensitivity refractive index based terahertz metasurface biosensor for detecting multiple cancers and infectious diseases","authors":"Taha Sheheryar , Ye Tian , Bo Lv , Lei Gao","doi":"10.1016/j.photonics.2025.101399","DOIUrl":"10.1016/j.photonics.2025.101399","url":null,"abstract":"<div><div>Despite notable progress, many existing terahertz biosensors rely on expensive materials like noble metals or 2D nanomaterials and are typically restricted to detecting specific biomarkers or single diseases, which limits their specificity, adaptability and real-world clinical utility. This work addresses these limitations by proposing a cost-effective, scalable refractive index based metasurface biosensor design that is composed of Aluminum and Polyimide. Through a dual-resonance mechanism, the sensor captures minute dielectric variations linked to multiple diseases including cancers such as breast, blood and cervical, as well as blood related infections like malaria. Under optimized simulation conditions, the sensor shows a high-Quality Factor exceeding 200, a Figure of Merit of 63.68 RIU⁻¹ and a sensitivity of 3.107 THz/RIU. Beyond its strong performance metrics, the sensor provides a cost-effective and non-invasive detection platform that seamlessly integrates simplicity, adaptability to multiple diseases and high diagnostic precision, advancing the field of early, rapid and accessible diagnostics across a wide range of biomedical applications, especially in resource limited settings.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101399"},"PeriodicalIF":2.5,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090240","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 : 2025-05-11DOI: 10.1016/j.photonics.2025.101398
Mengyang Xu , Dong Lin , Haoyuan Cai , Haoran Wang , Zhichun Fan , Jing Liu , Yushan Chen
In this study, a concave-convex array metasurface with a height difference characterized structure is proposed, combining in-plane and out-of-plane asymmetry to achieve a high Q-factor, refractive index sensing, and full control of the Fano spectral profile. Notably, both the concave model and the convex model, can only produce one Fano peak. But it can yield multiple Fano resonance peaks in the mid-infrared band following a simple combination. Herein, we have performed both near-field and far-field analysis for each Fano resonance generation. The designed metasurface achieves a remarkably high Q-factor of 9.63637 × 105. Moreover, it exhibits excellent reflection resonances under different polarization directions. In terms of refractive index sensing, the designed metasurface attains a sensitivity of 600 nm/RIU under TE polarization, while under TM polarization, it achieves full control of the Fano spectral profile by changing the incidence angle. The integration of periodic arrays with height differences in metasurfaces shows tremendous potential in controlling the Fano spectral profile and enhancing sensing capabilities. Additionally, this study will provide new inspirations for the sensing metasurface design with high optical performance.
{"title":"Mid-infrared band multi-Fano resonance-based sensing of high-Q concave-convex arrays of metasurface with full control of Fano spectral profile","authors":"Mengyang Xu , Dong Lin , Haoyuan Cai , Haoran Wang , Zhichun Fan , Jing Liu , Yushan Chen","doi":"10.1016/j.photonics.2025.101398","DOIUrl":"10.1016/j.photonics.2025.101398","url":null,"abstract":"<div><div>In this study, a concave-convex array metasurface with a height difference characterized structure is proposed, combining in-plane and out-of-plane asymmetry to achieve a high Q-factor, refractive index sensing, and full control of the Fano spectral profile. Notably, both the concave model and the convex model, can only produce one Fano peak. But it can yield multiple Fano resonance peaks in the mid-infrared band following a simple combination. Herein, we have performed both near-field and far-field analysis for each Fano resonance generation. The designed metasurface achieves a remarkably high Q-factor of 9.63637 × 10<sup>5</sup>. Moreover, it exhibits excellent reflection resonances under different polarization directions. In terms of refractive index sensing, the designed metasurface attains a sensitivity of 600 nm/RIU under TE polarization, while under TM polarization, it achieves full control of the Fano spectral profile by changing the incidence angle. The integration of periodic arrays with height differences in metasurfaces shows tremendous potential in controlling the Fano spectral profile and enhancing sensing capabilities. Additionally, this study will provide new inspirations for the sensing metasurface design with high optical performance.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101398"},"PeriodicalIF":2.5,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143948322","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}
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