Pub Date : 2025-02-01DOI: 10.1016/j.photonics.2024.101350
Pavel S. Pankin , Dmitrii N. Maksimov , Stepan V. Nabol , Daniil S. Buzin , Aleksey I. Krasnov , Vitaly S. Sutormin , Denis A. Kostikov , Abylgazy S. Abdullaev , Mikhail N. Krakhalev , Nikita A. Zolotovskii , Sergey V. Nedelin , Igor A. Tambasov , Victor Ya. Zyryanov , Ivan V. Timofeev
A resonant microcavity with photonic crystal mirrors and a chiral liquid crystal resonant layer is fabricated. In our experimental set-up the microcavity is illuminated at Brewster’s angle, for which the TM-polarized scattering channels are open, while the TE-polarized channels are closed. Thus, the problem is reduced to two-channel scattering. By applying an external voltage to the resonant layer it is possible to control the position, linewidth and amplitude of multiple resonant lines via changing the radiation decay rate into the scattering channels due to polarization mixing within the chiral layer. It is found, that under a certain value of the applied voltage, the microcavity becomes transparent over a wide spectral range, i.e. none of the resonant modes can be excited.
{"title":"Voltage-induced transparency of photonic crystal microcavity with chiral liquid crystal layer","authors":"Pavel S. Pankin , Dmitrii N. Maksimov , Stepan V. Nabol , Daniil S. Buzin , Aleksey I. Krasnov , Vitaly S. Sutormin , Denis A. Kostikov , Abylgazy S. Abdullaev , Mikhail N. Krakhalev , Nikita A. Zolotovskii , Sergey V. Nedelin , Igor A. Tambasov , Victor Ya. Zyryanov , Ivan V. Timofeev","doi":"10.1016/j.photonics.2024.101350","DOIUrl":"10.1016/j.photonics.2024.101350","url":null,"abstract":"<div><div>A resonant microcavity with photonic crystal mirrors and a chiral liquid crystal resonant layer is fabricated. In our experimental set-up the microcavity is illuminated at Brewster’s angle, for which the TM-polarized scattering channels are open, while the TE-polarized channels are closed. Thus, the problem is reduced to two-channel scattering. By applying an external voltage to the resonant layer it is possible to control the position, linewidth and amplitude of multiple resonant lines via changing the radiation decay rate into the scattering channels due to polarization mixing within the chiral layer. It is found, that under a certain value of the applied voltage, the microcavity becomes transparent over a wide spectral range, i.e. none of the resonant modes can be excited.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101350"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167895","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 : 2025-02-01DOI: 10.1016/j.photonics.2025.101361
Peng Zhou , Shikai Deng , Rongrong Guo , Lei Chen , Han Ye , Yumin Liu
The ring structure radius of a perfect vortex beam (PVB) is invariant to topological charge, offering promising applications in optical communication, particle manipulation, and quantum optics. Integration of PVBs into on-chip optics remains challenging because complex and bulky optical devices are conventionally applied to generate PVBs. This paper reports that PVBs at telecommunication wavelengths can be generated through phase modulation in a single dielectric metasurface. The metasurface enables to generate PVBs with two distinct topological charges under orthogonal circular polarization illumination by employing a spin-multiplexing design strategy. Numerical simulations demonstrate that the radius of a PVB can be manipulated by modifying the structural parameters of the designed metasurface with high design flexibility. Further modulation of the polarization state of the incident light allows for the linear superposition of two PVBs with orthogonal circular polarization states to create a perfect Poincaré beam (PPB), which is characterized by a vectorial optical field on a higher-order Poincaré sphere. Our results introduce a straightforward method to develop versatile nanophotonic platforms for complex structured light generation and polarization engineering.
{"title":"Numerical investigations of spin-multiplexing perfect vortex beam generator via dielectric metasurface at telecommunication wavelengths","authors":"Peng Zhou , Shikai Deng , Rongrong Guo , Lei Chen , Han Ye , Yumin Liu","doi":"10.1016/j.photonics.2025.101361","DOIUrl":"10.1016/j.photonics.2025.101361","url":null,"abstract":"<div><div>The ring structure radius of a perfect vortex beam (PVB) is invariant to topological charge, offering promising applications in optical communication, particle manipulation, and quantum optics. Integration of PVBs into on-chip optics remains challenging because complex and bulky optical devices are conventionally applied to generate PVBs. This paper reports that PVBs at telecommunication wavelengths can be generated through phase modulation in a single dielectric metasurface. The metasurface enables to generate PVBs with two distinct topological charges under orthogonal circular polarization illumination by employing a spin-multiplexing design strategy. Numerical simulations demonstrate that the radius of a PVB can be manipulated by modifying the structural parameters of the designed metasurface with high design flexibility. Further modulation of the polarization state of the incident light allows for the linear superposition of two PVBs with orthogonal circular polarization states to create a perfect Poincaré beam (PPB), which is characterized by a vectorial optical field on a higher-order Poincaré sphere. Our results introduce a straightforward method to develop versatile nanophotonic platforms for complex structured light generation and polarization engineering.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101361"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167029","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 : 2025-02-01DOI: 10.1016/j.photonics.2025.101363
M.M. Popov, S.B. Glybovski, D.V. Tatarnikov
The paper proposes vertically oriented, semi-transparent metasurfaces to suppress radiation from a source in it’s shadow region. These metasurfaces consist of small metallic loop meta-atoms with lumped capacitors, designed such that their magnetic polarization is perpendicular to the incident wave. Semi-transparency is achieved by employing Fano resonance of total reflection, while undesired full transparency resonance is avoided by adjusting the capacitor placement. The metasurfaces admittance profile is analytically synthesized using geometrical optics for large source distances and numerically optimized for practical scenarios with smaller screens and closer source distances. Simulation results demonstrate up to 20 dB radiation suppression across the entire shadow region for screen sizes near 2λ and source distances around 0.5λ, without reducing the gain in the lightened domain.
{"title":"Semi-transparent magnetic metasurface screens with modulated impedance for mitigation of radiation in the shadow domain","authors":"M.M. Popov, S.B. Glybovski, D.V. Tatarnikov","doi":"10.1016/j.photonics.2025.101363","DOIUrl":"10.1016/j.photonics.2025.101363","url":null,"abstract":"<div><div>The paper proposes vertically oriented, semi-transparent metasurfaces to suppress radiation from a source in it’s shadow region. These metasurfaces consist of small metallic loop meta-atoms with lumped capacitors, designed such that their magnetic polarization is perpendicular to the incident wave. Semi-transparency is achieved by employing Fano resonance of total reflection, while undesired full transparency resonance is avoided by adjusting the capacitor placement. The metasurfaces admittance profile is analytically synthesized using geometrical optics for large source distances and numerically optimized for practical scenarios with smaller screens and closer source distances. Simulation results demonstrate up to 20 dB radiation suppression across the entire shadow region for screen sizes near 2<em>λ</em> and source distances around 0.5<em>λ</em>, without reducing the gain in the lightened domain.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101363"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377258","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 : 2024-11-26DOI: 10.1016/j.photonics.2024.101328
Zhichao Shen , Bo Lv , Zao Yi , Ye Tian , Yuxi Jin , Sijie Wang , Ting Liu , Shiyun Xia , Hongyang Mu , Xuanrui Zhang , Jinhui Shi
Recently, various metamaterial-based harvesters have been investigated for harvesting electromagnetic energy from the ambient environment. However, they suffer from narrow absorption bandwidths and low energy harvesting efficiency. In this paper, we propose a miniaturized dual-layer metasurface designed for harvesting ambient electromagnetic energy, featuring wide-angle responsivity and polarization-insensitivity. The metasurface comprises two metal rings and two layers of dielectric substrates. The results demonstrate that the harvester functions within the S- and C-bands, resonating at frequencies of 2.98 GHz and 4.32 GHz, respectively. These resonant frequencies induce electric dipole oscillations, facilitating strong absorption of electromagnetic waves. The harvesting efficiency can reach to 92.5 % and 93.4 % at the two frequencies. Moreover, the harvester performance over a wide range of incidence angles and various polarized angles of the incident wave is analyzed. The harvester can be used for harvesting the redundant electromagnetic energy of communications or radars in the future.
最近，人们研究了各种基于超材料的采集器，用于从周围环境中采集电磁能。然而，它们存在吸收带宽窄和能量收集效率低的问题。在本文中，我们提出了一种用于收集环境电磁能的微型双层超表面，它具有广角响应性和极化不敏感性。该元表面由两个金属环和两层电介质基板组成。研究结果表明，该收集器可在 S 波段和 C 波段内工作，共振频率分别为 2.98 千兆赫和 4.32 千兆赫。这些共振频率会引起电偶极子振荡，从而促进对电磁波的强烈吸收。在这两个频率下，采集效率可达 92.5 % 和 93.4 %。此外，还分析了入射波在各种入射角和偏振角范围内的性能。该采集器未来可用于采集通信或雷达的冗余电磁能。
{"title":"Dual-frequency polarization-insensitive and wide-angle metasurface for electromagnetic energy harvesting","authors":"Zhichao Shen , Bo Lv , Zao Yi , Ye Tian , Yuxi Jin , Sijie Wang , Ting Liu , Shiyun Xia , Hongyang Mu , Xuanrui Zhang , Jinhui Shi","doi":"10.1016/j.photonics.2024.101328","DOIUrl":"10.1016/j.photonics.2024.101328","url":null,"abstract":"<div><div>Recently, various metamaterial-based harvesters have been investigated for harvesting electromagnetic energy from the ambient environment. However, they suffer from narrow absorption bandwidths and low energy harvesting efficiency. In this paper, we propose a miniaturized dual-layer metasurface designed for harvesting ambient electromagnetic energy, featuring wide-angle responsivity and polarization-insensitivity. The metasurface comprises two metal rings and two layers of dielectric substrates. The results demonstrate that the harvester functions within the S- and C-bands, resonating at frequencies of 2.98 GHz and 4.32 GHz, respectively. These resonant frequencies induce electric dipole oscillations, facilitating strong absorption of electromagnetic waves. The harvesting efficiency can reach to 92.5 % and 93.4 % at the two frequencies. Moreover, the harvester performance over a wide range of incidence angles and various polarized angles of the incident wave is analyzed. The harvester can be used for harvesting the redundant electromagnetic energy of communications or radars in the future.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101328"},"PeriodicalIF":2.5,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720533","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 : 2024-11-24DOI: 10.1016/j.photonics.2024.101330
Pham Hong Phong , Tran Hong Minh , Vu Thi Thuy Linh , Nguyen Trong Nghia , Nghiem Thi Ha Lien , Nguyen Duc Toan , Do Tien Phat , Le Minh Thanh , Nguyen Thi Hanh
Using photonic crystal materials for colorimetric sensing, the influences of structure and composition on the photonic bandgap (PBG) of materials are always vital to detection. In this work, the effects of pores in the structure of polyethylene diacrylate-based inverse opal photonic crystal (PEGDA-based IOPC) and the concentration of silver nanoparticles (AgNPs) used for decoration of the IOPC by chemical reaction on the shift of PBG center (λrp) have been studied for rapid semi-quantification of Escherichia coli (E. coli). We found that pores in the structure of PEGDA-based IOPC significantly increased the amount of AgNPs attached to this material compared with the structure created by the ordered self-assembly of spherical SiO2 particles of the parent template, leading to a pronounced red-shift of λrp. At the concentration of 20 µg/L AgNPs (CAgNPs) used for decoration, the shift of λrp reached 80 nm due to the increase in the average refractive index (naver.) of the material. It thus enabled us to observe changes in the color of the reflected light with the naked eye. In addition, since the increase in the concentration of E.coli (CE.coli) also caused a red-shift of the λrp, the CAgNPs, thus, could be reduced but still give a sufficiently strong shift of λrp to detect E.coli at a high level. The spectral position of the reflectance peak changed from green to red with increasing the CE.coli from 50 cfu/mL to 106 cfu/mL at the CAgNPs = 10 µg/L. These results indicated the potential application of AgNPs decorated PEGDA-based IOPC in rapid semi-quantification of E.coli by the naked eye.
{"title":"Improving the label-free rapid semi-quantification of E.coli by AgNPs-decorated hydrogel inverse opal photonic crystals","authors":"Pham Hong Phong , Tran Hong Minh , Vu Thi Thuy Linh , Nguyen Trong Nghia , Nghiem Thi Ha Lien , Nguyen Duc Toan , Do Tien Phat , Le Minh Thanh , Nguyen Thi Hanh","doi":"10.1016/j.photonics.2024.101330","DOIUrl":"10.1016/j.photonics.2024.101330","url":null,"abstract":"<div><div>Using photonic crystal materials for colorimetric sensing, the influences of structure and composition on the photonic bandgap (PBG) of materials are always vital to detection. In this work, the effects of pores in the structure of polyethylene diacrylate-based inverse opal photonic crystal (PEGDA-based IOPC) and the concentration of silver nanoparticles (AgNPs) used for decoration of the IOPC by chemical reaction on the shift of PBG center (λ<sub>rp</sub>) have been studied for rapid semi-quantification of <em>Escherichia coli</em> (<em>E. coli</em>). We found that pores in the structure of PEGDA-based IOPC significantly increased the amount of AgNPs attached to this material compared with the structure created by the ordered self-assembly of spherical SiO<sub>2</sub> particles of the parent template, leading to a pronounced red-shift of λ<sub>rp</sub>. At the concentration of 20 µg/L AgNPs (<em>C</em><sub>AgNPs</sub>) used for decoration, the shift of λ<sub>rp</sub> reached 80 nm due to the increase in the average refractive index (<em>n</em><sub><em>aver</em>.</sub>) of the material. It thus enabled us to observe changes in the color of the reflected light with the naked eye. In addition, since the increase in the concentration of <em>E.coli</em> (<em>C</em><sub>E.coli</sub>) also caused a red-shift of the λ<sub>rp</sub>, the <em>C</em><sub>AgNPs</sub>, thus, could be reduced but still give a sufficiently strong shift of λ<sub>rp</sub> to detect <em>E.coli</em> at a high level. The spectral position of the reflectance peak changed from green to red with increasing the <em>C</em><sub><em>E.coli</em></sub> from 50 cfu/mL to 10<sup>6</sup> cfu/mL at the <em>C</em><sub>AgNPs</sub> = 10 µg/L. These results indicated the potential application of AgNPs decorated PEGDA-based IOPC in rapid semi-quantification of <em>E.coli</em> by the naked eye.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101330"},"PeriodicalIF":2.5,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720534","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 : 2024-11-24DOI: 10.1016/j.photonics.2024.101329
Haoxiang Li , Da Mu , Zongyu Cui , Jiaojiao Ren , Jianli Ma , Yu Zhou , Zihao Lin
Traditional terahertz imaging systems are constrained by a limited depth of field, which leads to blurry images outside the focal point. To address this limitation, we designed a metasurface with rectangular pillar-structured units based on the transmission phase using a ceramic slurry. Using the finite-difference time-domain method for calculations and simulations, the arranged metasurface unit cells in a ring configuration produced a Bessel beam with a non-diffracting distance of 30 mm. The study found that the phase gradient, light source divergence angle, material refractive index variation, and processing errors influenced the beam propagation characteristics. Notably, the phase gradient and light source divergence angle are directly proportional to the non-diffracting distance and significantly affect the performance of imaging system. The metasurface designed in this study enhances the depth of field of terahertz imaging systems and offers novel insights into the manipulation and application of terahertz beams. This innovation has potential applications in fields such as terahertz imaging and nondestructive testing.
{"title":"Research on terahertz bessel beams based on metasurface","authors":"Haoxiang Li , Da Mu , Zongyu Cui , Jiaojiao Ren , Jianli Ma , Yu Zhou , Zihao Lin","doi":"10.1016/j.photonics.2024.101329","DOIUrl":"10.1016/j.photonics.2024.101329","url":null,"abstract":"<div><div>Traditional terahertz imaging systems are constrained by a limited depth of field, which leads to blurry images outside the focal point. To address this limitation, we designed a metasurface with rectangular pillar-structured units based on the transmission phase using a ceramic slurry. Using the finite-difference time-domain method for calculations and simulations, the arranged metasurface unit cells in a ring configuration produced a Bessel beam with a non-diffracting distance of 30 mm. The study found that the phase gradient, light source divergence angle, material refractive index variation, and processing errors influenced the beam propagation characteristics. Notably, the phase gradient and light source divergence angle are directly proportional to the non-diffracting distance and significantly affect the performance of imaging system. The metasurface designed in this study enhances the depth of field of terahertz imaging systems and offers novel insights into the manipulation and application of terahertz beams. This innovation has potential applications in fields such as terahertz imaging and nondestructive testing.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101329"},"PeriodicalIF":2.5,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747888","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 : 2024-11-20DOI: 10.1016/j.photonics.2024.101327
Anton Kharchevskii , Ildar Yusupov , Dmitry Dobrykh , Mikhail Udrov , Sergey Geyman , Yulia Grigorovich , Alexander Zolotarev , Mikhail Sidorenko , Irina Melchakova , Anna Mikhailovskaya , Pavel Ginzburg
Near-field communication is considered to have a high level of hardware security protection owing to its natural short-range wireless operation, which makes a man-in-the-middle attack impossible. Here we question this statement by demonstrating a several-meter range NFC communication channel, supported by resonance-tuned large-area distributed coils. Typical NFC antenna architectures encompass multi-turn wires, forming flat resonant coils. Being several centimeters across, those devices cannot provide reliable communication between items, situated more than a fraction of a meter apart. An appealing approach to the range extension is to enlarge the coil area, thus spreading the magnetic field over larger distances. However, in this case, the overall length of folded conducting wires becomes wavelength comparable, nevertheless, the overall size of the coil remains electrically small, considering the 13.56 MHz operation frequency. Here we demonstrate several coil designs and establish a reliable NFC channel over several-meter distances. Adaptive impedance matching is implemented to maintain an energy power transfer between resonant coils, thus further extending the communication channel and making it robust to clutter. The ability for long-range NFC communication raises security concerns in sensitive contactless operations like wireless payments, prompting the need for enhanced countermeasures due to potential hardware vulnerabilities.
{"title":"Long-range over-a-meter NFC link budget with distributed large-area coils","authors":"Anton Kharchevskii , Ildar Yusupov , Dmitry Dobrykh , Mikhail Udrov , Sergey Geyman , Yulia Grigorovich , Alexander Zolotarev , Mikhail Sidorenko , Irina Melchakova , Anna Mikhailovskaya , Pavel Ginzburg","doi":"10.1016/j.photonics.2024.101327","DOIUrl":"10.1016/j.photonics.2024.101327","url":null,"abstract":"<div><div>Near-field communication is considered to have a high level of hardware security protection owing to its natural short-range wireless operation, which makes a man-in-the-middle attack impossible. Here we question this statement by demonstrating a several-meter range NFC communication channel, supported by resonance-tuned large-area distributed coils. Typical NFC antenna architectures encompass multi-turn wires, forming flat resonant coils. Being several centimeters across, those devices cannot provide reliable communication between items, situated more than a fraction of a meter apart. An appealing approach to the range extension is to enlarge the coil area, thus spreading the magnetic field over larger distances. However, in this case, the overall length of folded conducting wires becomes wavelength comparable, nevertheless, the overall size of the coil remains electrically small, considering the 13.56 MHz operation frequency. Here we demonstrate several coil designs and establish a reliable NFC channel over several-meter distances. Adaptive impedance matching is implemented to maintain an energy power transfer between resonant coils, thus further extending the communication channel and making it robust to clutter. The ability for long-range NFC communication raises security concerns in sensitive contactless operations like wireless payments, prompting the need for enhanced countermeasures due to potential hardware vulnerabilities.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101327"},"PeriodicalIF":2.5,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747889","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}
Tunning localized surface plasmon resonance (LSPR) in transparent conducting oxides (TCO) has a great impact on various LSPR-based technologies. In addition to the commonly reported mechanisms used for tunning LSPR in TCOs (e.g., size, shape, carrier density modifications via intrinsic and extrinsic doping), integrating them in core-shell structures provides an additional degree of freedom to expand its tunability, enhance its functionality, and widen its versatility through application-oriented core-shell geometrical optimization. In this work, we explore the tuneability and functionality of two TCO nanostructures; indium doped tin oxide (ITO) and gallium doped zinc oxide (GZO) encapsulated with silver shell within the extended theoretical Mie theory formalism. The effect of core and shell sizes on LSPR peak position and line width as well as absorption and scattering coefficients is numerically investigated. Simulations showed that LSPRs of ITO-Ag and GZO-Ag core-shell nanostructures have great tunning capabilities, spanning from VIS to IR spectral range including therapeutic window of human tissue and essential solar energy spectrum. Potential functionality as refractive index sensor (RIS) and solar energy absorber (SEA) are examined using appropriate figure of merits . Simulations indicate that a geometrically optimized core-shell architecture with exceptional for RIS and SEA can be realized. Contrary to carrier density manipulation, integrating TCO cores to metallic shells proves to be an effective approach to enhance tunability and optimize functionality for high performance TCO-based plasmonic devices, with minimum impact on the inherited physical and chemical properties of the used TCO-core materials.
{"title":"Tuneability and optimum functionality of plasmonic transparent conducting oxide-Ag core-shell nanostructures","authors":"Mohamed K. Zayed , Hesham Fares , Jamal Q.M. Almarashi , Samar Moustafa","doi":"10.1016/j.photonics.2024.101326","DOIUrl":"10.1016/j.photonics.2024.101326","url":null,"abstract":"<div><div>Tunning localized surface plasmon resonance (LSPR) in transparent conducting oxides (TCO) has a great impact on various LSPR-based technologies. In addition to the commonly reported mechanisms used for tunning LSPR in TCOs (e.g., size, shape, carrier density modifications via intrinsic and extrinsic doping), integrating them in core-shell structures provides an additional degree of freedom to expand its tunability, enhance its functionality, and widen its versatility through application-oriented core-shell geometrical optimization. In this work, we explore the tuneability and functionality of two TCO nanostructures; indium doped tin oxide (ITO) and gallium doped zinc oxide (GZO) encapsulated with silver shell within the extended theoretical Mie theory formalism. The effect of core and shell sizes on LSPR peak position and line width as well as absorption and scattering coefficients is numerically investigated. Simulations showed that LSPRs of ITO-Ag and GZO-Ag core-shell nanostructures have great tunning capabilities, spanning from VIS to IR spectral range including therapeutic window of human tissue and essential solar energy spectrum. Potential functionality as refractive index sensor (RIS) and solar energy absorber (SEA) are examined using appropriate figure of merits <span><math><mrow><mo>(</mo><mi>FoM</mi><mo>)</mo></mrow></math></span>. Simulations indicate that a geometrically optimized core-shell architecture with exceptional <span><math><mi>FoMs</mi></math></span> for RIS and SEA can be realized. Contrary to carrier density manipulation, integrating TCO cores to metallic shells proves to be an effective approach to enhance tunability and optimize functionality for high performance TCO-based plasmonic devices, with minimum impact on the inherited physical and chemical properties of the used TCO-core materials.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"62 ","pages":"Article 101326"},"PeriodicalIF":2.5,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656408","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}
Fano resonance (FR) is a universal phenomenon that is used to attain electromagnetic-induced transparency (EIT), high absorption and sensitivity, and low-power photonic devices. This work presents dual FR refractive index (RI) sensor models on a plasmonic metal-insulator-metal (MIM) waveguide system. The FR phenomenon is attained by including circular and elliptic nanorod defects in the bus waveguides. The resonances originate from the defect's narrow discreteness and the rectangular resonator's broad state. Analytical methods such as finite difference time domain (FDTD) and multimode interference coupled mode theory are adopted to analyze the FRs. The shapes of the Fano line and resonance peak amplitude can be tuned independently by controlling the diameter of the defects, the separation between the defects, and the coupling (between the resonator and the bus waveguide) distance. Moreover, the proposed structures detect the RI (human hemoglobin) variation in the bus waveguide and resonator. The obtained results with circular nanorod defect verify the autocorrelation coefficient of 99.92 %, ensuring the device's linearity and high performance. However, an autocorrelation of 99.7 % is attained by using two elliptic nanorod defects.
{"title":"Plasmonic MIM waveguide based FR sensors for refractive index sensing of human hemoglobin","authors":"Lokendra Singh , Bukya Balaji , Yogesh Tripathi , Roshan Kumar , Sameer Yadav","doi":"10.1016/j.photonics.2024.101325","DOIUrl":"10.1016/j.photonics.2024.101325","url":null,"abstract":"<div><div>Fano resonance (FR) is a universal phenomenon that is used to attain electromagnetic-induced transparency (EIT), high absorption and sensitivity, and low-power photonic devices. This work presents dual FR refractive index (RI) sensor models on a plasmonic metal-insulator-metal (MIM) waveguide system. The FR phenomenon is attained by including circular and elliptic nanorod defects in the bus waveguides. The resonances originate from the defect's narrow discreteness and the rectangular resonator's broad state. Analytical methods such as finite difference time domain (FDTD) and multimode interference coupled mode theory are adopted to analyze the FRs. The shapes of the Fano line and resonance peak amplitude can be tuned independently by controlling the diameter of the defects, the separation between the defects, and the coupling (between the resonator and the bus waveguide) distance. Moreover, the proposed structures detect the RI (human hemoglobin) variation in the bus waveguide and resonator. The obtained results with circular nanorod defect verify the autocorrelation coefficient of 99.92 %, ensuring the device's linearity and high performance. However, an autocorrelation of 99.7 % is attained by using two elliptic nanorod defects.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"62 ","pages":"Article 101325"},"PeriodicalIF":2.5,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656409","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 : 2024-10-30DOI: 10.1016/j.photonics.2024.101324
Jian-Xiang Zhang , Qian Wang , Kelei Miao
Transition metal ditellurides (TMDTs) have numerous attractive properties, making them suitable for a wide range of applications. In this study, cobalt ditelluride (CoTe2) nanosheets, a promising TMDT for photonic applications, were prepared using an ultrasound-enhanced liquid phase exfoliation (LPE) method. A novel saturable absorber (SA) employing CoTe2 nanosheets was then fabricated by optically depositing them on microfiber. The nonlinear optical modulation properties of the CoTe2 SA were investigated. A high-performance 1 μm ultrafast fiber laser was demonstrated by incorporating newly developed CoTe2 nanosheets-based SA in a ring cavity ytterbium-doped fiber laser (YDFL). The dynamical behaviour of the proposed passively mode-locked YDFL in response to variations in pump optical power was investigated. The findings reveal that the device achieved a modulation depth of 2.5 %, and saturation light intensity of 30.6 MW/cm2. Moreover, a stable and robust mode-locked soliton optical pulse sequence with a fundamental repetition frequency of 3.089 MHz, and a pulse duration of 224 fs was generated at 1032 nm. The proposed YDFL, being all-fiber, compact, and cost-effective, is set to find extensive applications in various domains, including optical fiber communication, sensing, and biomedical imaging.
{"title":"224-fs soliton pulses generation at 1μm from ytterbium-doped fiber laser with CoTe2 nanosheets as an ultrafast modulator","authors":"Jian-Xiang Zhang , Qian Wang , Kelei Miao","doi":"10.1016/j.photonics.2024.101324","DOIUrl":"10.1016/j.photonics.2024.101324","url":null,"abstract":"<div><div>Transition metal ditellurides (TMDTs) have numerous attractive properties, making them suitable for a wide range of applications. In this study, cobalt ditelluride (CoTe<sub>2</sub>) nanosheets, a promising TMDT for photonic applications, were prepared using an ultrasound-enhanced liquid phase exfoliation (LPE) method. A novel saturable absorber (SA) employing CoTe<sub>2</sub> nanosheets was then fabricated by optically depositing them on microfiber. The nonlinear optical modulation properties of the CoTe<sub>2</sub> SA were investigated. A high-performance 1 μm ultrafast fiber laser was demonstrated by incorporating newly developed CoTe<sub>2</sub> nanosheets-based SA in a ring cavity ytterbium-doped fiber laser (YDFL). The dynamical behaviour of the proposed passively mode-locked YDFL in response to variations in pump optical power was investigated. The findings reveal that the device achieved a modulation depth of 2.5 %, and saturation light intensity of 30.6 MW/cm<sup>2</sup>. Moreover, a stable and robust mode-locked soliton optical pulse sequence with a fundamental repetition frequency of 3.089 MHz, and a pulse duration of 224 fs was generated at 1032 nm. The proposed YDFL, being all-fiber, compact, and cost-effective, is set to find extensive applications in various domains, including optical fiber communication, sensing, and biomedical imaging.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"62 ","pages":"Article 101324"},"PeriodicalIF":2.5,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593162","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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