Photonics and Nanostructures-Fundamentals and Applications最新文献

{"title":"Quadrupole photonic topological corner states in generalized non-square lattices with translation symmetry","authors":"Kang-Hyok O,&nbsp;Kwang-Hyon Kim","doi":"10.1016/j.photonics.2023.101219","DOIUrl":"10.1016/j.photonics.2023.101219","url":null,"abstract":"<div><p>Quadrupole<span><span> topological insulators<span><span> have recently attracted great attention in the field of topological physics, while they are limited to square and hexagonal lattices. In this work, we theoretically show that nontrivial quadrupole </span>topology can be obtained in generalized non-square lattice </span></span>photonic crystals with translation symmetry, which are composed of parallelogram-shaped unit cells. The translation symmetry is described by the fractional linear combination of primary lattice vectors, leading to the quantization of fractional quadrupole moment in conjunction with an additional symmorphic symmetry. For parallelogramatic lattice with inversion symmetry, in particular, the quantization of the quadrupole moment is independent of the choice of primary lattice vectors, enabling cavity structures with arbitrary angles. For the change of structural parameters, quadrupole bandgaps undergo second-order topological phase transitions, accompanying with double band inversions. Nontrivial quadrupole phases are manifested by the appearance of disorder-immune in-gap corner states localized at the topological interfaces. Furthermore, the proposed parallelogramatic lattice photonic crystal has multiple quadrupole bandgaps for proper structural parameters, exhibiting multiband second-order topological corner states. The presented results will further extend the class of quadrupole topological photonic crystals and pave a broad way towards their practical applications due to improved design flexibility.</span></p></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"58 ","pages":"Article 101219"},"PeriodicalIF":2.7,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138542180","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}

{"title":"Numerical analysis of charge carriers injection in a light emitter or detector device based on a metal-semiconductor-metal structure","authors":"Abolfazl Mahmoodpoor ,&nbsp;Sergey Makarov","doi":"10.1016/j.photonics.2023.101213","DOIUrl":"10.1016/j.photonics.2023.101213","url":null,"abstract":"<div><p>Modern metal-semiconductor-metal nano- and micro-structures exhibit unique properties related to both light emission and detection. Here we develop a novel optimized numerical model to calculate charge carrier density inside a n-type semiconductor micro-crystal that is sandwiched between two Schottky contacts<span>. We use drift-diffusion equations and finite difference methods<span> and utilize the Scharfetter-Gummel discretization technique. We demonstrate that the concentration of majority charge carriers in the semiconductor can be reduced below the level observed at zero applied bias by surpassing the current density of minority charge carriers beyond that of the majority charge carriers. Subsequently, minority charge carrier concentration increases and becomes the dominant charge carrier inside the semiconductor at high applied bias. In addition, we provide evidence that the open circuit voltage of a semiconductor under illumination occurs at the point where the minority-majority current densities intersect. By adjusting the Schottky contact barrier, the crossing potential between minority and majority carriers can be controlled, thereby allowing for manipulation of the open circuit voltage. This is an important factor in determining the density of trap states in the semiconductor and designing an open circuit voltage photodetector. We verify our results using COMSOL Multiphysics software and show that our numerical approach is found to be more time-efficient than the methods employed by COMSOL Multiphysics.</span></span></p></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"58 ","pages":"Article 101213"},"PeriodicalIF":2.7,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138542151","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}

{"title":"Mid-infrared second harmonic generation in p-type Ge/SiGe quantum wells: Toward waveguide integration","authors":"V. Falcone ,&nbsp;S. Calcaterra ,&nbsp;G. Chesi ,&nbsp;M. Virgilio ,&nbsp;J. Frigerio","doi":"10.1016/j.photonics.2023.101217","DOIUrl":"https://doi.org/10.1016/j.photonics.2023.101217","url":null,"abstract":"<div><p><span>In this work we investigate a structure based on p-doped Ge/SiGe asymmetric-coupled quantum wells<span> (ACQW) that enables the second harmonic generation<span> in SiGe waveguide by double-resonant intersubband transitions (ISBTs). These transitions lead to χ</span></span></span>⁽²⁾ coefficients in the range 10⁴-10⁵ pm/V, significantly higher compared to the one of conventional nonlinear materials. We developed a model for the integration of Quantum Wells (QWs) into the active region of the waveguide through an adiabatic taper. Furthermore, we modelled the second harmonic (SH) conversion efficiency as a function of the propagation length, under both non-phase matching and phase-matching conditions. Our work demonstrates that the SiGe ACQWs can be used in spectral ranges not covered by the majority of conventional non-linear crystals, while allowing for the ready-integration with the CMOS technologies.</p></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"58 ","pages":"Article 101217"},"PeriodicalIF":2.7,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138480586","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}

{"title":"Optimized, highly efficient silicon antennas for optical phased arrays","authors":"Henna Farheen ,&nbsp;Andreas Strauch ,&nbsp;J. Christoph Scheytt ,&nbsp;Viktor Myroshnychenko ,&nbsp;Jens Förstner","doi":"10.1016/j.photonics.2023.101207","DOIUrl":"10.1016/j.photonics.2023.101207","url":null,"abstract":"<div><p>Silicon photonics, in conjunction with complementary metal-oxide-semiconductor (CMOS) fabrication, has greatly enhanced the development of integrated optical phased arrays. This facilitates a dynamic control of light in a compact form factor that enables the synthesis of arbitrary complex wavefronts in the infrared spectrum. We numerically demonstrate a large-scale two-dimensional silicon-based optical phased array (OPA) composed of nanoantennas with circular gratings that are balanced in power and aligned in phase, required for producing elegant radiation patterns in the far-field. For a wavelength of 1.55 μm, we optimize two antennas for the OPA exhibiting an upward radiation efficiency as high as 90%, with almost 6.8% of optical power concentrated in the field of view. Additionally, we believe that the proposed OPAs can be easily fabricated and would have the ability to generate complex holographic images, rendering them an attractive candidate for a wide range of applications like LiDAR sensors, optical trapping, optogenetic stimulation, and augmented-reality displays.</p></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"58 ","pages":"Article 101207"},"PeriodicalIF":2.7,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1569441023001013/pdfft?md5=28ea85f30bbd33a371479c65dbf67127&pid=1-s2.0-S1569441023001013-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138530134","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}

{"title":"Broadband antenna array realization with printed meta-elements and its multipoles spectra","authors":"Vladimir D. Burtsev ,&nbsp;Tatyana S. Vosheva ,&nbsp;Sergey Y. Prokhorov ,&nbsp;Anton A. Khudykin ,&nbsp;Dmitry S. Filonov","doi":"10.1016/j.photonics.2023.101215","DOIUrl":"10.1016/j.photonics.2023.101215","url":null,"abstract":"<div><p>A simulated and manufactured broadband antenna array<span><span><span> of 2×2 meta-elements operating in the range of 2.5–4.5 GHz is presented. The characteristic size of the aperture of this sample is two wavelengths, but its realized gain exceeds 11.3 dBi in the entire range and reaches a peak of 14.3 dBi at the frequency of 3.2 GHz. Such results become possible by the successful combining electric and magnetic multipoles of the meta-elements, slightly spaced in frequency. As a trade off in accuracy and manufactring costs we use </span>additive manufacturing: 3D printing of meta-elements on a </span>photopolymer printer and subsequent metallization of their surface were involved in the manufacture of the antenna array.</span></p></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"58 ","pages":"Article 101215"},"PeriodicalIF":2.7,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138542166","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}

{"title":"Optical LC-like resonances in high-index particles","authors":"Xiang-yang Liu ,&nbsp;Cheng-ping Huang","doi":"10.1016/j.photonics.2023.101212","DOIUrl":"10.1016/j.photonics.2023.101212","url":null,"abstract":"<div><p><span>Electric LC resonances, occurring in metallic circuits, govern the motion of free electrons or electric signals. In this paper, optical LC-like resonances in high-index particles (HIPs) or </span>dielectric<span><span> LC resonances have been studied, which involve bounded electrons and optical fields instead. The resonance effect is dominated by optical analogues of inductance and capacitance, which can be determined according to the electromagnetic energy bounded near the particle. The viewpoint of dielectric optical circuit with equivalent parameters facilitates the understanding of dielectric resonance effect. The result also provides a method for studying the </span>optical properties of the HIPs.</span></p></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"58 ","pages":"Article 101212"},"PeriodicalIF":2.7,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138530162","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}

{"title":"Towards phased array antenna operating in Ku-band for satellite communications","authors":"Anton V. Nikulin ,&nbsp;Aleksey N. Kosmynin ,&nbsp;Vladimir D. Burtsev ,&nbsp;Sergey Y. Prokhorov ,&nbsp;Tatyana S. Vosheva ,&nbsp;Dmitry S. Filonov","doi":"10.1016/j.photonics.2023.101216","DOIUrl":"10.1016/j.photonics.2023.101216","url":null,"abstract":"<div><p><span>Satellite communication systems for mounting on vehicles are commonly based on phased array antennas<span><span> with electronical beam steering. In this work we develop active metasurface-based receive-transmit antenna arrays for newly deployed </span>satellite constellation system running in Ku-band. Both receive and transmit subarrays are based on patch-antenna elements driven in circular polarization using 90</span></span>^∘ hybrids. In both subarrays we optimized elements sizes and array period to have optimal ellipticity, gain, side lobe level. In electromagnetic simulations we achieved realized gain of 32.2 dBi for the Rx subarray and 33.4 dBi for the Tx subarray obtained in a broad scanning angle range from − 15^∘ to + 45^∘.</p></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"58 ","pages":"Article 101216"},"PeriodicalIF":2.7,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138530161","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}

{"title":"Interaction of microwaves with nanocomposites containing Fe particles","authors":"D.V. Perov ,&nbsp;E.A. Kuznetsov ,&nbsp;A.B. Rinkevich ,&nbsp;O.V. Nemytova ,&nbsp;M.A. Uimin","doi":"10.1016/j.photonics.2023.101214","DOIUrl":"https://doi.org/10.1016/j.photonics.2023.101214","url":null,"abstract":"<div><p><span>Transmission of microwaves through a composite plate containing Fe </span>nanoparticles<span><span> in an epoxyamine matrix, as well as reflection of waves from it, has been investigated. The experiments were performed at the frequencies from 26 to 38 GHz in the magnetic fields up to 12 kOe. The ferromagnetic resonance line in the composites with the weight fraction of Fe particles from 10% to 30% has been studied. The magnetic field dependence of the microwave power dissipation has been plotted. Field dependence of the transmission and reflection coefficients have been calculated, as well as qualitative, and in some cases quantitative, agreement has been obtained. The penetration depth of microwaves into the composites has been analyzed. Spectrum of the FMR has been constructed. Results of interaction of microwaves with Fe nanoparticles are discussed taking into account </span>magnetic properties and composite structure.</span></p></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"58 ","pages":"Article 101214"},"PeriodicalIF":2.7,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138484348","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}

{"title":"Metamaterial-inspired absorber for GNSS and 5G pioneer spectrum band: Achieving narrow bandwidth, wide incidence angle, and polarization agnostic","authors":"Mayank A. Ardeshana ,&nbsp;Falgunkumar N. Thakkar ,&nbsp;Sunayana G. Domadia","doi":"10.1016/j.photonics.2023.101210","DOIUrl":"https://doi.org/10.1016/j.photonics.2023.101210","url":null,"abstract":"<div><p><span>The recent emergence of electromagnetic (EM) metamaterial<span> absorbers (MAs) with exceptionally high absorption rates has captured the interest of numerous researchers. This study introduces an innovative design for a dual-band microwave absorber, inspired by metamaterial concepts. A square ring resonator, a second ring resonator with splits at each of its four corners, and a third ring resonator created by joining two I-shaped pieces make up the unit cell, which has the dimensions </span></span><span><math><mrow><mn>25.5</mn><mo>×</mo><mn>25.5</mn><mo>×</mo><mn>2.54</mn><msup><mrow><mi>mm</mi></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span><span><span>. These resonators are realized on a metal-backed FR-4 substrate, a common dielectric material<span> found in printed circuit boards. The primary objective of this absorber's configuration is to achieve remarkable absorption peaks at 1.55 GHz and 3.3 GHz, attaining absorption levels of 99.73% and 99.41%, respectively. Notably, the design is insensitive to polarization and exhibits a broad incidence angle of up to 60°. It maintains high absorption rates of 95% for the transverse electric mode and 94% for the transverse magnetic mode. In order to optimize the suggested design, parametric studies were carried out for unit cell design by varying the split gap, loss tangent, and various types of metal. The advanced design system (ADS) software was used to assess an equivalent circuit, and the results of the CST simulation were compared with the circuit, confirming good agreement. These attributes are well-suited for efficiently absorbing signals within specific frequency ranges, catering to the demands of applications such as Global Navigation Satellite Systems (GNSS) and the pioneering 5G frequency band. Simulation and measured results of the absorber closely align with the expected performance, affirming the efficacy of the design. In essence, this solution provides an effective means of absorbing </span></span>electromagnetic waves<span> in these defined frequency ranges, rendering it highly suitable for diverse wireless communication and navigation systems.</span></span></p></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"58 ","pages":"Article 101210"},"PeriodicalIF":2.7,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138490937","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}

{"title":"Adjustable broadband absorber based on vanadium dioxide multiple coupled diagonally sliced square ring shaped structure for THz frequency","authors":"Pankaj Binda ,&nbsp;Sagnik Banerjee ,&nbsp;Rajendra Mitharwal ,&nbsp;Sarita Nanda","doi":"10.1016/j.photonics.2023.101211","DOIUrl":"https://doi.org/10.1016/j.photonics.2023.101211","url":null,"abstract":"<div><p>A broadband absorber with multiple coupled diagonally sliced square rings at terahertz frequency using vanadium dioxide is proposed. The proposed structure exhibits more than 90 % absorption in the frequency range of 2.85–7.51 THz, with a relative bandwidth of 89.96 % and an absorption bandwidth of 4.66 THz. The absorptivity curve increases as vanadium dioxide conductivity rises from 200 S/m to 200,000 S/m, giving a wide range of tunability from 1.62 % to 100 % at 3.4 THz. Due to its geometrical symmetry, the proposed structure is independent of the polarization angle under normal incident plane waves. The proposed structure works for different incident angles for transverse electric (TE) mode and transverse magnetic (TM) mode with oblique incidence plane waves. The results demonstrate the broad bandwidth compared to the state-of-the-art designs within the same frequency band with potential applications in sensors, switches, tuning, and modulation in the terahertz range.</p></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"58 ","pages":"Article 101211"},"PeriodicalIF":2.7,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138480296","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}