Pub Date : 2025-07-01Epub 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":"2025-07-01","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 : 2025-07-01Epub 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":"2025-07-01","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 : 2025-05-01Epub Date: 2025-03-18DOI: 10.1016/j.photonics.2025.101383
Renjie Li , Yanze Gao , Weijie Liu , Tongtong An , Hongcheng Pan , Yuan Mu , Xujin Yuan
The photo-thermo-acoustic (PTA) effect of a three-layer composite material whose surface is fabricated with many periodic micro-nano structures (PMNS) is investigated in this paper. The material is composed of a silicon substrate, a thermal insulation layer of polyimide, and a light-absorbing layer of aluminum nanoaggregates. We propose a method for analyzing the PTA effect based on the idea of finite element meshing. The PTA conversion processes including the photo-thermal conversion and the thermal-acoustic conversion are quantitatively simulated. The influence of the geometric parameters of the PMNS on the intensity and space distribution of the sound field is analyzed both by simulation and experiment. The results show that fabricating PMNS on composite materials can significantly enhance the PTA effect. And the finite element analyzing method proposed in this paper can correctly describe and predict the PTA effect of composite materials with two-dimensional PMNS. It is also applicable for analyzing the PTA effects of other similar materials or structures.
{"title":"Photo-thermo-acoustic (PTA) effect of a multilayer composite material with periodic micro-nano structures (PMNS): Modeling, simulation and experiment","authors":"Renjie Li , Yanze Gao , Weijie Liu , Tongtong An , Hongcheng Pan , Yuan Mu , Xujin Yuan","doi":"10.1016/j.photonics.2025.101383","DOIUrl":"10.1016/j.photonics.2025.101383","url":null,"abstract":"<div><div>The photo-thermo-acoustic (PTA) effect of a three-layer composite material whose surface is fabricated with many periodic micro-nano structures (PMNS) is investigated in this paper. The material is composed of a silicon substrate, a thermal insulation layer of polyimide, and a light-absorbing layer of aluminum nanoaggregates. We propose a method for analyzing the PTA effect based on the idea of finite element meshing. The PTA conversion processes including the photo-thermal conversion and the thermal-acoustic conversion are quantitatively simulated. The influence of the geometric parameters of the PMNS on the intensity and space distribution of the sound field is analyzed both by simulation and experiment. The results show that fabricating PMNS on composite materials can significantly enhance the PTA effect. And the finite element analyzing method proposed in this paper can correctly describe and predict the PTA effect of composite materials with two-dimensional PMNS. It is also applicable for analyzing the PTA effects of other similar materials or structures.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"64 ","pages":"Article 101383"},"PeriodicalIF":2.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683866","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}
High-efficiency and highly integrated optical switches in integrated photonic circuits have long been a pursuit for researchers. Due to the inherent limitations of silicon materials and fabrication processes, commonly used resonant or interferometric optical switches typically require tens to hundreds of micrometers of footprint to achieve desirable modulation efficiency. In response, we propose an optical switch structure filled with phase-change material (PCM) in a narrow slit, with tapered waveguides on curved sides coupling light in and out of the slit, enabling strong light-matter interaction. This structure consists of curved-side tapered coupling waveguides at both ends and a slit filled with GST (Ge2Sb2Te5) in the middle. By applying an external stimulus to induce a phase change in the GST, which exhibits significant differences in optical properties between its crystalline and amorphous states, substantial modulation efficiency can be achieved. Operating in the transverse electric mode within the band of 1500–1600 nm, this structure can achieve an extinction ratio (ER) of 34.08 dB and an insertion loss (IL) of 0.18 dB at 1550 nm, and this design can still achieve an ER over 27.26 dB and an IL less than 0.43 dB within a wavelength range of ± 50 nm, with an overall length of just 10 micrometers. The proposed structure offers high modulation efficiency and a low footprint, while also exhibiting high tolerance to fabrication errors, making it highly promising for future photonic communication systems.
{"title":"Compact hybrid waveguide optical switch with low loss and high extinction ratio based on Ge2Sb2Te5","authors":"Tong Jiang , Qipeng Zhan , Hao Ding , Zhixiang Huang , Li Ding","doi":"10.1016/j.photonics.2025.101368","DOIUrl":"10.1016/j.photonics.2025.101368","url":null,"abstract":"<div><div>High-efficiency and highly integrated optical switches in integrated photonic circuits have long been a pursuit for researchers. Due to the inherent limitations of silicon materials and fabrication processes, commonly used resonant or interferometric optical switches typically require tens to hundreds of micrometers of footprint to achieve desirable modulation efficiency. In response, we propose an optical switch structure filled with phase-change material (PCM) in a narrow slit, with tapered waveguides on curved sides coupling light in and out of the slit, enabling strong light-matter interaction. This structure consists of curved-side tapered coupling waveguides at both ends and a slit filled with GST (Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub>) in the middle. By applying an external stimulus to induce a phase change in the GST, which exhibits significant differences in optical properties between its crystalline and amorphous states, substantial modulation efficiency can be achieved. Operating in the transverse electric mode within the band of 1500–1600 nm, this structure can achieve an extinction ratio (ER) of 34.08 dB and an insertion loss (IL) of 0.18 dB at 1550 nm, and this design can still achieve an ER over 27.26 dB and an IL less than 0.43 dB within a wavelength range of ± 50 nm, with an overall length of just 10 micrometers. The proposed structure offers high modulation efficiency and a low footprint, while also exhibiting high tolerance to fabrication errors, making it highly promising for future photonic communication systems.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"64 ","pages":"Article 101368"},"PeriodicalIF":2.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592347","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 : 2025-05-01Epub Date: 2025-02-20DOI: 10.1016/j.photonics.2025.101369
Ahmad Khanehzar, Naser Zamani, Ali Hatef
Phase change materials (PCMs) are attractive candidates for tunable devices due to their unique properties, such as high degree of scalability, thermal control, low power consumption, wide waveband operation, and the ability to switch between different optical phases. These properties can be enhanced by integrating PCMs with other materials, such as plasmonic nanoparticles. In this work, a core-shell nanostructure (Au@GSST) is proposed comprising a gold nanoparticle (AuNP) core coated with Ge2Sb2Se4Te1 (GSST), a PCM with high optical contrast, embedded in an aqueous medium. We demonstrate how the phase transition of GSST can be actively controlled by the light energy absorption of the Au@GSST. The integration of the Au core facilitates the phase change process of GSST due to its plasmonic effect, which leads to lower heat capacity and higher heat conductivity of the AuNP. These characteristics accelerate the GSST phase change process at a lower continuous wave (CW) laser intensity compared to a bare GSST nanoparticle. An induced photothermal process that includes heat transfer, the crystalline fraction, and the electric field enhancement of the Au@GSST, as functions of the laser wavelength and intensity is investigated. Our results show that through this process, the GSST shell can be tuned between fully amorphous, intermediate, and fully crystalline states. This phase transition leads to a substantial modification of the optical responses of the Au@GSST. The absorption, scattering and extinction cross-sections of the structure over a wide range of wavelengths before and after the GSST phase transition is studied. We focus on two specific wavelengths, 778 nm and 919 nm, which exhibit higher light absorption contrast in both the amorphous and crystalline phases of GSST. Such active tunning of Au@GSST without morphological variation can be utilized in reconfigurable nanophotonic devices, such as switches, modulators, and sensors.
{"title":"Tunable NIR nano-absorber based on photothermal response and thermoplasmonic modulation of Au@GSST core-shell nanoparticle","authors":"Ahmad Khanehzar, Naser Zamani, Ali Hatef","doi":"10.1016/j.photonics.2025.101369","DOIUrl":"10.1016/j.photonics.2025.101369","url":null,"abstract":"<div><div>Phase change materials (PCMs) are attractive candidates for tunable devices due to their unique properties, such as high degree of scalability, thermal control, low power consumption, wide waveband operation, and the ability to switch between different optical phases. These properties can be enhanced by integrating PCMs with other materials, such as plasmonic nanoparticles. In this work, a core-shell nanostructure (Au@GSST) is proposed comprising a gold nanoparticle (AuNP) core coated with Ge<sub>2</sub>Sb<sub>2</sub>Se<sub>4</sub>Te<sub>1</sub> (GSST), a PCM with high optical contrast, embedded in an aqueous medium. We demonstrate how the phase transition of GSST can be actively controlled by the light energy absorption of the Au@GSST. The integration of the Au core facilitates the phase change process of GSST due to its plasmonic effect, which leads to lower heat capacity and higher heat conductivity of the AuNP. These characteristics accelerate the GSST phase change process at a lower continuous wave (CW) laser intensity compared to a bare GSST nanoparticle. An induced photothermal process that includes heat transfer, the crystalline fraction, and the electric field enhancement of the Au@GSST, as functions of the laser wavelength and intensity is investigated. Our results show that through this process, the GSST shell can be tuned between fully amorphous, intermediate, and fully crystalline states. This phase transition leads to a substantial modification of the optical responses of the Au@GSST. The absorption, scattering and extinction cross-sections of the structure over a wide range of wavelengths before and after the GSST phase transition is studied. We focus on two specific wavelengths, 778 nm and 919 nm, which exhibit higher light absorption contrast in both the amorphous and crystalline phases of GSST. Such active tunning of Au@GSST without morphological variation can be utilized in reconfigurable nanophotonic devices, such as switches, modulators, and sensors.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"64 ","pages":"Article 101369"},"PeriodicalIF":2.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480497","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":"2025-05-01","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 : 2025-05-01Epub Date: 2025-03-17DOI: 10.1016/j.photonics.2025.101382
Abdulkadir Cildir , Farooq A. Tahir , Muhammad Farooq , Adnan Zahid , Muhammad Imran , Qammer H. Abbasi
This research paper introduces a new design of metasurface for polarization conversion applications, functioning as both a cross (half-wave plate) and circular (quarter wave plate) polarizer in reflection mode. Comprising unit cells on one side and a metal layer on the other, with a Roger 5880 substrate, the metasurface demonstrates its ability to reflect an incident - or -polarized wave as a - or -polarized wave across multiple frequency bands: 9.72–10.00 GHz, 17.65–41.87 GHz, 45.67–45.80 GHz, and 49.66–49.84 GHz. The design achieves a noteworthy 24.82 GHz bandwidth with a 98.72 % fractional bandwidth for linear-to-linear conversion, demonstrating efficiency exceeding 90 %. Simultaneously, the metasurface converts the incident wave into a right-hand circularly polarized (RHCP) wave at frequencies ranging from 9.38 to 9.61 GHz, 45.9–46.1 GHz, and 49.96–50 GHz. It transforms the wave into a left-hand circularly polarized (LHCP) wave within the frequency band from 10.19 to 10.61 GHz, 15.60–16.82 GHz, and 45.45–45.6 GHz. The design also exhibits angular stability up to 45 degrees. Experimental validation using the fabricated prototype confirms the findings, showing good agreement with numerical results. This metasurface comes in handy for future communication, radar application, and health applications. This metasurface is highly suitable for future communication systems, radar applications, and healthcare technologies.
{"title":"A highly efficient and broadband metasurface for linear-to-linear and linear-to-circular polarization conversion in reflection mode","authors":"Abdulkadir Cildir , Farooq A. Tahir , Muhammad Farooq , Adnan Zahid , Muhammad Imran , Qammer H. Abbasi","doi":"10.1016/j.photonics.2025.101382","DOIUrl":"10.1016/j.photonics.2025.101382","url":null,"abstract":"<div><div>This research paper introduces a new design of metasurface for polarization conversion applications, functioning as both a cross (half-wave plate) and circular (quarter wave plate) polarizer in reflection mode. Comprising unit cells on one side and a metal layer on the other, with a Roger 5880 substrate, the metasurface demonstrates its ability to reflect an incident <span><math><mi>x</mi></math></span>- or <span><math><mi>y</mi></math></span>-polarized wave as a <span><math><mi>y</mi></math></span>- or <span><math><mi>x</mi></math></span>-polarized wave across multiple frequency bands: 9.72–10.00 GHz, 17.65–41.87 GHz, 45.67–45.80 GHz, and 49.66–49.84 GHz. The design achieves a noteworthy 24.82 GHz bandwidth with a 98.72 % fractional bandwidth for linear-to-linear conversion, demonstrating efficiency exceeding 90 %. Simultaneously, the metasurface converts the incident wave into a right-hand circularly polarized (RHCP) wave at frequencies ranging from 9.38 to 9.61 GHz, 45.9–46.1 GHz, and 49.96–50 GHz. It transforms the wave into a left-hand circularly polarized (LHCP) wave within the frequency band from 10.19 to 10.61 GHz, 15.60–16.82 GHz, and 45.45–45.6 GHz. The design also exhibits angular stability up to 45 degrees. Experimental validation using the fabricated prototype confirms the findings, showing good agreement with numerical results. This metasurface comes in handy for future communication, radar application, and health applications. This metasurface is highly suitable for future communication systems, radar applications, and healthcare technologies.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"64 ","pages":"Article 101382"},"PeriodicalIF":2.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-05-01Epub Date: 2025-03-01DOI: 10.1016/j.photonics.2025.101371
Md. Ferdous Rahman , Md. Mahin Tasdid , Mohammed M. Fadhali , Mukul Sharma , Mehdi Akermi
The limited photon absorption capacity of single-active-layer perovskite solar cells (PSCs) restricts their efficiency and scalability for future photovoltaic applications. This study introduces an innovative double perovskite active layer (DPAL) design, incorporating CsSnI3 and CsPbI3, along with a cadmium sulfide (CdS) electron transport layer (ETL), to overcome these challenges. Using the SCAPS-1D simulation tool, we demonstrate that this novel configuration significantly improves performance, achieving a power conversion efficiency (PCE) of 28.74 %, an open-circuit voltage (VOC) of 0.996 V, a short-circuit current density (JSC) of 34.94 mA/cm², and a fill factor (FF) of 82.61 %. These results surpass the efficiencies of single-active-layer designs, which reach 17.84 % for CsPbI3 and 24.08 % for CsSnI3. The study further explores the influence of active layer thickness, defect density, and interface defect densities on solar cell performance, along with the effects of doping concentration, series and shunt resistance, and temperature on PCE. This research highlights the potential of DPAL-based PSCs as a promising approach for achieving high-efficiency, stable, and cost-effective solar energy solutions.
{"title":"Unlocking Cesium based new double absorber perovskite solar cells with efficiency above 28 % for next generation solar cell","authors":"Md. Ferdous Rahman , Md. Mahin Tasdid , Mohammed M. Fadhali , Mukul Sharma , Mehdi Akermi","doi":"10.1016/j.photonics.2025.101371","DOIUrl":"10.1016/j.photonics.2025.101371","url":null,"abstract":"<div><div>The limited photon absorption capacity of single-active-layer perovskite solar cells (PSCs) restricts their efficiency and scalability for future photovoltaic applications. This study introduces an innovative double perovskite active layer (DPAL) design, incorporating CsSnI<sub>3</sub> and CsPbI<sub>3</sub>, along with a cadmium sulfide (CdS) electron transport layer (ETL), to overcome these challenges. Using the SCAPS-1D simulation tool, we demonstrate that this novel configuration significantly improves performance, achieving a power conversion efficiency (PCE) of 28.74 %, an open-circuit voltage (V<sub>OC</sub>) of 0.996 V, a short-circuit current density (J<sub>SC</sub>) of 34.94 mA/cm², and a fill factor (FF) of 82.61 %. These results surpass the efficiencies of single-active-layer designs, which reach 17.84 % for CsPbI<sub>3</sub> and 24.08 % for CsSnI<sub>3</sub>. The study further explores the influence of active layer thickness, defect density, and interface defect densities on solar cell performance, along with the effects of doping concentration, series and shunt resistance, and temperature on PCE. This research highlights the potential of DPAL-based PSCs as a promising approach for achieving high-efficiency, stable, and cost-effective solar energy solutions.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"64 ","pages":"Article 101371"},"PeriodicalIF":2.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578125","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 : 2025-05-01Epub Date: 2025-03-31DOI: 10.1016/j.photonics.2025.101384
Mikhail Astafurov , Elena Perevedentseva , Nikolay Melnik , Mikhail Shevchenko , Sergey Dorofeev , Alexander Ezhov , Daniil Kozlov , Anastasia Grigorieva , Sergey Klimonsky
Bilayer opal-type stripes periodically arranged on the same substrate were self-assembled using the vertical deposition of SiO2 spheres with the intermittent motion of the meniscus. It has been shown that each such stripe with a gold or silver coating can be considered as an independent element for surface enhanced Raman scattering (SERS). The thicknesses of the gold and silver coatings were optimized using computer simulations of electromagnetic field enhancement. Monolayer or bilayer stripes of such type are not inferior to thick opal films with noble metal coating. The stripe patterned structures are easy to manufacture, exhibit good homogeneity and may be promising for automating multiple SERS tests. The structures with gold coating also demonstrate high resistance to environmental influences. The prospects for further improvement of their properties were analyzed.
{"title":"SERS in opal-type stripe patterned structures with metal coating","authors":"Mikhail Astafurov , Elena Perevedentseva , Nikolay Melnik , Mikhail Shevchenko , Sergey Dorofeev , Alexander Ezhov , Daniil Kozlov , Anastasia Grigorieva , Sergey Klimonsky","doi":"10.1016/j.photonics.2025.101384","DOIUrl":"10.1016/j.photonics.2025.101384","url":null,"abstract":"<div><div>Bilayer opal-type stripes periodically arranged on the same substrate were self-assembled using the vertical deposition of SiO<sub>2</sub> spheres with the intermittent motion of the meniscus. It has been shown that each such stripe with a gold or silver coating can be considered as an independent element for surface enhanced Raman scattering (SERS). The thicknesses of the gold and silver coatings were optimized using computer simulations of electromagnetic field enhancement. Monolayer or bilayer stripes of such type are not inferior to thick opal films with noble metal coating. The stripe patterned structures are easy to manufacture, exhibit good homogeneity and may be promising for automating multiple SERS tests. The structures with gold coating also demonstrate high resistance to environmental influences. The prospects for further improvement of their properties were analyzed.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"64 ","pages":"Article 101384"},"PeriodicalIF":2.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760121","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 : 2025-05-01Epub Date: 2025-03-12DOI: 10.1016/j.photonics.2025.101379
Omar A.M. Abdelraouf , Ahmed Mousa , Mohamed Ragab
Metasurfaces are crucial in advancing flat optics and nanophotonics, offering unique advantages in creating vibrant structural colors and high-Q factor cavities. Multi-layer metasurfaces (MLMs) take this further by enhancing light-matter interactions inside the single meta-atom at the nanoscale. However, optimizing MLM designs is challenging due to the complex interplay of many parameters, making traditional simulation methods slow and inefficient. In this work, we introduce NanoPhotoNet, an advanced AI-powered design tool that leverages a hybrid deep neural network (DNN) combining convolutional neural networks (CNN) and Long Short-Term Memory (LSTM) models. NanoPhotoNet significantly accelerates the design process for MLMs, achieving over 98.3 % prediction accuracy and a 50,000x speed improvement compared to conventional techniques. This enables the creation of structural colors far beyond the standard RGB range, increasing the RGB gamut area up to 163 %. Additionally, NanoPhotoNet facilitates tunable color generation, extending the capabilities of MLMs to advanced applications like tunable color filters, nanolasers, and reconfigurable beam steering. This approach represents a transformative progress in metasurface design, unlocking new possibilities for high-performance, tunable nanophotonic devices.
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