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}
Pub Date : 2025-04-22DOI: 10.1016/j.photonics.2025.101387
Amir Alfonso Rodriguez Santana, Mohammad Danaeifar
Bound states in the continuum (BICs) hold significant potential for enhancing light-matter interactions with high quality (Q) factor resonances. Concurrently, tungsten disulfide (WS2), a transition metal dichalcogenide (TMDC), provides a pathway to attain the strong-coupling regime, garnering significant interest from researchers. In this study, we engineer polarization sensitivity in metasurfaces constructed from bulk WS2 slabs, employing two distinct approaches. Firstly, we synthesize a polarization-sensitive metasurface composed of dual slabs with varying dimensions to achieve symmetry-protected BICs. The rotation of the electric field direction of the incident wave leads to a dramatic change in the transmittance response. Conversely, by considering a quad-slab unit cell, we develop a polarization-independent metasurface that exhibits a unique response to any orientation of the electric field of the incident wave. For both types of metasurfaces, we demonstrate the generation and tuning of quasi-BIC resonances by adjusting the degree of asymmetry. Furthermore, we elucidate how to achieve the strong coupling regime characterized by an anticrossing pattern through scaling the in-plane dimensions of the unit cell. In the strong coupling regime, Rabi splitting exhibits two distinct values of 104.2 meV and 116.8 meV for polarization-sensitive and polarization-independent metasurfaces, respectively. The polarization sensitivity engineering presented herein can be applied across various photonic systems, enabling the development of devices that are either highly sensitive or polarization-independent.
{"title":"Polarization sensitivity engineering in WS2 metasurfaces governed by quasi-bound states in the continuum","authors":"Amir Alfonso Rodriguez Santana, Mohammad Danaeifar","doi":"10.1016/j.photonics.2025.101387","DOIUrl":"10.1016/j.photonics.2025.101387","url":null,"abstract":"<div><div>Bound states in the continuum (BICs) hold significant potential for enhancing light-matter interactions with high quality (Q) factor resonances. Concurrently, tungsten disulfide (WS<sub>2</sub>), a transition metal dichalcogenide (TMDC), provides a pathway to attain the strong-coupling regime, garnering significant interest from researchers. In this study, we engineer polarization sensitivity in metasurfaces constructed from bulk WS<sub>2</sub> slabs, employing two distinct approaches. Firstly, we synthesize a polarization-sensitive metasurface composed of dual slabs with varying dimensions to achieve symmetry-protected BICs. The rotation of the electric field direction of the incident wave leads to a dramatic change in the transmittance response. Conversely, by considering a quad-slab unit cell, we develop a polarization-independent metasurface that exhibits a unique response to any orientation of the electric field of the incident wave. For both types of metasurfaces, we demonstrate the generation and tuning of quasi-BIC resonances by adjusting the degree of asymmetry. Furthermore, we elucidate how to achieve the strong coupling regime characterized by an anticrossing pattern through scaling the in-plane dimensions of the unit cell. In the strong coupling regime, Rabi splitting exhibits two distinct values of 104.2 meV and 116.8 meV for polarization-sensitive and polarization-independent metasurfaces, respectively. The polarization sensitivity engineering presented herein can be applied across various photonic systems, enabling the development of devices that are either highly sensitive or polarization-independent.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101387"},"PeriodicalIF":2.5,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864406","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 : 2025-04-19DOI: 10.1016/j.photonics.2025.101388
Anjineya K , Don Mathew , Meghna C.H , Vincent Mathew
This work proposes a refractive index sensor designed with a 1D (One-dimensional) topological photonic crystal by merging two 1D photonic crystals, which differ topologically, and introducing a defect layer at the interface of these two photonic crystals. It is designed by finding and analyzing the Zak phase of the photonic crystals, and the results ensure increased sensitivity and quality factor, with the highest figure of merit of 29383.759(RIU−1). The topologically protected edge state is used for sensing, which guarantees well-defined peaks with sufficient shifts in wavelength even for a minuscule change in analyte refractive index. The change in sensitivity, quality factor, and figure of merit is studied, and the response to the change in the refractive index is impressive.
{"title":"Analysis of refractive index sensor using topological photonic protected edge state in one-dimensional photonic crystal","authors":"Anjineya K , Don Mathew , Meghna C.H , Vincent Mathew","doi":"10.1016/j.photonics.2025.101388","DOIUrl":"10.1016/j.photonics.2025.101388","url":null,"abstract":"<div><div>This work proposes a refractive index sensor designed with a 1D (One-dimensional) topological photonic crystal by merging two 1D photonic crystals, which differ topologically, and introducing a defect layer at the interface of these two photonic crystals. It is designed by finding and analyzing the Zak phase of the photonic crystals, and the results ensure increased sensitivity and quality factor, with the highest figure of merit of 29383.759(<em>RIU</em><sup>−1</sup>). The topologically protected edge state is used for sensing, which guarantees well-defined peaks with sufficient shifts in wavelength even for a minuscule change in analyte refractive index. The change in sensitivity, quality factor, and figure of merit is studied, and the response to the change in the refractive index is impressive.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101388"},"PeriodicalIF":2.5,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864407","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 : 2025-04-18DOI: 10.1016/j.photonics.2025.101389
Chengchao Wang , Haojun Zhu , Hengyi Fan , Yinmo Xie , Qingzhi Lai , Lanxin Ma
Nanocomposite films based on Cesium tungsten oxide (CWO) and Indium tin oxide (ITO) nanoparticles provide a broad space for adjusting the optical properties of energy-saving windows due to their unique near-infrared absorption properties. This property has led to great research interest in the field of energy-saving windows for such materials. The optical properties of energy-saving windows are mainly determined by localized surface plasmon resonance (LSPR) of the nanoparticles, and thus they are sensitive to the variation of the geometrical parameters of the nanoparticles. Typically, the computational cost of the design of specific optical properties and iterative optimization of the geometrical parameters is expensive and time-consuming. In this study, we combine machine learning and radiative transfer calculations to achieve targeted design energy-saving windows. By adjusting the shape, material, and geometric parameters of nanoparticles, an analysis model can be established from the geometric parameters of nanoparticles to the properties of energy-saving windows. Then, a machine learning model of bidirectional deep neural network is developed to achieve accurate prediction of optical evaluation parameters (visible transmittance (Tlum), near-infrared (NIR) transmittance (TNIR), solar radiation transmittance (Tsol), and the Figure of Merit (FOM)) for energy-saving windows, as well as inverse design of geometric parameters of nanoparticles (CWO and ITO). The results indicate that our machine learning model achieved forward prediction of energy-saving window optical properties with an accuracy of over 99 % and inverse geometric parameter design with an accuracy of over 93 %. Overall, this work provides a broadly appropriate and computationally efficient method for evaluating and designing the properties of energy-saving windows.
{"title":"Machine-learning-assisted design of energy-saving windows with high near-infrared shielding properties","authors":"Chengchao Wang , Haojun Zhu , Hengyi Fan , Yinmo Xie , Qingzhi Lai , Lanxin Ma","doi":"10.1016/j.photonics.2025.101389","DOIUrl":"10.1016/j.photonics.2025.101389","url":null,"abstract":"<div><div>Nanocomposite films based on Cesium tungsten oxide (CWO) and Indium tin oxide (ITO) nanoparticles provide a broad space for adjusting the optical properties of energy-saving windows due to their unique near-infrared absorption properties. This property has led to great research interest in the field of energy-saving windows for such materials. The optical properties of energy-saving windows are mainly determined by localized surface plasmon resonance (LSPR) of the nanoparticles, and thus they are sensitive to the variation of the geometrical parameters of the nanoparticles. Typically, the computational cost of the design of specific optical properties and iterative optimization of the geometrical parameters is expensive and time-consuming. In this study, we combine machine learning and radiative transfer calculations to achieve targeted design energy-saving windows. By adjusting the shape, material, and geometric parameters of nanoparticles, an analysis model can be established from the geometric parameters of nanoparticles to the properties of energy-saving windows. Then, a machine learning model of bidirectional deep neural network is developed to achieve accurate prediction of optical evaluation parameters (visible transmittance (<em>T</em><sub>lum</sub>), near-infrared (NIR) transmittance (<em>T</em><sub>NIR</sub>), solar radiation transmittance (<em>T</em><sub>sol</sub>), and the Figure of Merit (<em>FOM</em>)) for energy-saving windows, as well as inverse design of geometric parameters of nanoparticles (CWO and ITO). The results indicate that our machine learning model achieved forward prediction of energy-saving window optical properties with an accuracy of over 99 % and inverse geometric parameter design with an accuracy of over 93 %. Overall, this work provides a broadly appropriate and computationally efficient method for evaluating and designing the properties of energy-saving windows.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"65 ","pages":"Article 101389"},"PeriodicalIF":2.5,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855482","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}
Efforts were done to enhance the nonlinear optical and optical power limiting responses of Indole-7-carboxaldehyde (I7C) after the addition of silver and gold nanoparticles. The investigations were done theoretically as well as experimentally. The reactivity parameters and potential surfaces established strong intermolecular charge interactions between metal trimer and I7C. The diffraction pattern for both I7C+AgNPs and I7C+AuNPs indicated the perfect crystallinity of the samples. The band gap of I7C+AgNPs (2.08 eV) was less than that of I7C+AuNPs (2.34 eV). The polarizability of I7C was enhanced after the addition of gold and silver nanoparticles. The value of first-order hyperpolarizability of probe I7C was observed as 4.24 × 10−30 esu which was increased to ten times for I7C+AgNPs and eighteen times for I7C+AuNPs. The increased value of first-order hyperpolarizability supported enhanced nonlinear optical characteristics of I7C+AgNPs and I7C+AuNPs. Further, the reduction in experimentally obtained optical limiting threshold and increment in the nonlinear absorption coefficient reflects early attenuation of the nonlinear optical and enhanced optical limiting activity of I7C+AgNPs and I7C+AuNPs.
{"title":"Indole-7-carboxaldehyde functionalized silver and gold nanoparticles as novel metal-organic laser power limiting composites","authors":"Shradha Lakhera , Meenakshi Rana , A. Dhanusha , T.C. Sabari Girisun , Shruti Sharma , Papia Chowdhury","doi":"10.1016/j.photonics.2025.101386","DOIUrl":"10.1016/j.photonics.2025.101386","url":null,"abstract":"<div><div>Efforts were done to enhance the nonlinear optical and optical power limiting responses of Indole-7-carboxaldehyde (I7C) after the addition of silver and gold nanoparticles. The investigations were done theoretically as well as experimentally. The reactivity parameters and potential surfaces established strong intermolecular charge interactions between metal trimer and I7C. The diffraction pattern for both I7C+AgNPs and I7C+AuNPs indicated the perfect crystallinity of the samples. The band gap of I7C+AgNPs (2.08 eV) was less than that of I7C+AuNPs (2.34 eV). The polarizability of I7C was enhanced after the addition of gold and silver nanoparticles. The value of first-order hyperpolarizability of probe I7C was observed as 4.24 × 10<sup>−30</sup> esu which was increased to ten times for I7C+AgNPs and eighteen times for I7C+AuNPs. The increased value of first-order hyperpolarizability supported enhanced nonlinear optical characteristics of I7C+AgNPs and I7C+AuNPs. Further, the reduction in experimentally obtained optical limiting threshold and increment in the nonlinear absorption coefficient reflects early attenuation of the nonlinear optical and enhanced optical limiting activity of I7C+AgNPs and I7C+AuNPs.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"64 ","pages":"Article 101386"},"PeriodicalIF":2.5,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143834172","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 : 2025-04-02DOI: 10.1016/j.photonics.2025.101385
Varvara Kharitonova , Anastasia Lubimova , Valentin A. Milichko , Semyon V. Bachinin
The development of electro-optical computing systems today is proceeding at an unprecedented pace and requires the emergence of new approaches and materials for data recording and storage. Here we report on a direct laser writing (DLW) of binary data on a surface of metal-organic framework (MOF) thin film over 0.5 s with 1.5 μm resolution. The data, expressed as locally modified areas of different depth and potential, are analyzed with atomic force microscopy in Kelvin-probe regime. We reveal that an increase in laser power yields an increase in the potential of the modified area up to 100 mV (compared with 10 mV for the initial MOF surface) and decrease of the area diameter up to 1.5 μm. The mechanism of DLW is also investigated with confocal Raman spectroscopy, confirming the local modification of the structure of MOF thin film. The results, thereby, open the way for fast optical writing of electronic data with compatible density on MOFs at ambient conditions.
{"title":"Direct laser writing of binary data on metal-organic framework surface","authors":"Varvara Kharitonova , Anastasia Lubimova , Valentin A. Milichko , Semyon V. Bachinin","doi":"10.1016/j.photonics.2025.101385","DOIUrl":"10.1016/j.photonics.2025.101385","url":null,"abstract":"<div><div>The development of electro-optical computing systems today is proceeding at an unprecedented pace and requires the emergence of new approaches and materials for data recording and storage. Here we report on a direct laser writing (DLW) of binary data on a surface of metal-organic framework (MOF) thin film over 0.5 s with 1.5 μm resolution. The data, expressed as locally modified areas of different depth and potential, are analyzed with atomic force microscopy in Kelvin-probe regime. We reveal that an increase in laser power yields an increase in the potential of the modified area up to 100 mV (compared with 10 mV for the initial MOF surface) and decrease of the area diameter up to 1.5 μm. The mechanism of DLW is also investigated with confocal Raman spectroscopy, confirming the local modification of the structure of MOF thin film. The results, thereby, open the way for fast optical writing of electronic data with compatible density on MOFs at ambient conditions.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"64 ","pages":"Article 101385"},"PeriodicalIF":2.5,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777203","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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