In a brand new publication from Opto-Electronic Advances; DOI 10.29026/oea.2021.200030 , Researchers led by Professor Liu Yan from Xidian University, China and Professor Gan Xuetao from Northwestern Polytechnical University, China contemplate technology and application of the high-Q resonance in all-dielectric metasurfaces.
Metamaterials are synthetic composite electromagnetic constructions consisting of subwavelength models, which might notice environment friendly and versatile management of the electromagnetic waves. Metamaterials are an rising analysis space for optoelectronics, physics, chemistry and supplies, as a consequence of their novel bodily properties and potential purposes.
With the growth in the fabrication of nanostructures, all-dielectric metasurfaces have attracted a lot analysis consideration as a result of of their excessive effectivity and low loss. However, metasurfaces primarily based on conventional optical supplies (akin to silicon) can solely help comparatively low Q resonances, limiting their purposes in lasing motion, sensing, and nonlinear optics. A just lately emerged idea of sure states in the continuum (BICs) gives a brand new resolution to beat this downside. The idea of BICs was first launched in quantum mechanics. It represents a wave phenomenon of modes, which have the vitality mendacity in the delocalized states inside the continuum. The BIC-supporting metasurfaces can obtain controllable high-Q resonance, which might lengthen their applicability to the units requiring sharp spectral options.
The authors of this text suggest a Si metasurface primarily based on symmetry-broken blocks, which might obtain the high-Q resonance. Nanoparticles made of typical supplies can solely help a comparatively low high quality issue. The idea of BIC gives a brand new resolution to beat this downside. This idea firstly seems in quantum mechanics, the place a real BIC is a mathematical abstraction with infinite Q issue. In this work, symmetry breaking is launched into the symmetric periodic construction and the splendid BICs flip into the leaky mode with a excessive Q issue. At the similar time, the Q issue of the resonance will be managed by various the dimension of the launched defects. In addition, by altering the design proposal, the relationship between the Q issue and defect dimension can be adjusted. A high-Q resonance will be simply realized in this fashion and the nonlinear optical impact of the construction will be clearly enhanced at the resonance.
The analysis reported in this text paves a approach to manipulate BICs and notice high-Q dynamic resonances, which constitutes a big step in the direction of the growth of high-Q resonant photonic purposes. revolutionary and superior optical applied sciences.
Article reference: Fang CZ, Yang QY, Yuan QC, Gan XT, Zhao JL et al. High-Q resonances ruled by the quasi-bound states in the continuum in all-dielectric metasurfaces. Opto-Electron Adv 4, 200030 (2021). doi: 10.29026/oea.2021.200030
Keywords: all-dielectric metasurface, sure states in the continuum, optical nonlinearity, topological configuration
Professor Liu Yan, Xidian University, China, primarily focuses on ferroelectric nanodevices and novel nanophotonic units. Engaged in the analysis of semiconductor supplies and units, Professor Yan has made a lot pioneering analysis in excessive mobility channel CMOS and steep subthreshold swing units and is now, endeavor the Major analysis plan of the National Natural Science Foundation of China and the Key Research and Development Program of the Ministry of Science and Technology. Recent actions over the final 5 years embody the publication of greater than 50 papers in mainstream journals and purposes for greater than 20 patents in associated fields.
Professor Hao Yue, Chinese Academy of Sciences, is a senior member of the IEEE and govt director of the Chinese Association of Electronics. Professor Yue leads the knowledgeable group for the implementation of the main sci-tech objects of “core electronic devices, high-end universal chips, and basic software products” and the microelectronic know-how consultants group of the General Armament Department of the People’s Liberation Army of China. Professor Yue has printed greater than 150 papers so far throughout his educational profession.
Professor Han Genquan, Xidian University, China is a member of the “Hundred Talent Program” supported by Shaanxi Province, China. Professor Genquan has made many breakthroughs in excessive mobility channel CMOS and Beyond CMOS units, together with the implementation of high-performance pressure germanium-tin, pressure germanium, and InGaAs MOSFET units, germanium-tin tunneling field-effect transistor, and the unfavorable capacitance of the transistor. Professor Genquan has printed greater than 150 papers, submitted purposes for greater than 30 patents and has been a frequent invited speaker at worldwide conferences.
Professor Gan Xuetao, Northwestern Polytechnical University, China, is especially engaged in the analysis of micro nanophotonics, together with two-dimensional layered materials optoelectronics and spectroscopy amongst different areas and is dedicated to offering new theories and applied sciences for brand new optical data processing, optical interconnection on-chip, and optoelectronic units. Professor Xuetao has beforehand hosted National Science and Technology Fund “Excellent Youth Projects”, “Surface Projects” and “Youth Projects”. Professor Xuetao has been a frequent invited speaker at worldwide and home educational conferences and has printed greater than 50 papers in worldwide journals akin to Nature Photonics, Light Science & Applications and Opto-Electronic Advances.
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