Author Affiliations
Abstract
Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Recent advancements in photonic bound states in the continuum (BICs) have opened up exciting new possibilities for the design of optoelectronic devices with improved performance. In this perspective article, we provide an overview of recent progress in photonic BICs based on metamaterials and photonic crystals, focusing on both the underlying physics and their practical applications. The first part of this article introduces 2 different interpretations of BICs, based on far-field interference of multipoles and near-field analysis of topological charges. We then discuss recent research on manipulating the far-field radiation properties of BICs through engineering topological charges. The second part of the article summarizes recent developments in the applications of BICs, including chiral light and vortex beam generation, nonlinear optical frequency conversion, sensors, and nanolasers. Finally, we conclude with a discussion of the potential of photonic BICs to advance terahertz applications in areas such as generation and detection, modulation, sensing, and isolation. We believe that continued research in this area will lead to exciting new advancements in optoelectronics, particularly in the field of terahertz devices.
Ultrafast Science
2023, 3(1): 0033
Author Affiliations
Abstract
Bound states in the continuum (BICs) have exhibited extraordinary properties in photonics for enhanced light-matter interactions that enable appealing applications in nonlinear optics, biosensors, and ultrafast optical switches. The most common strategy to apply BICs in a metasurface is by breaking symmetry of resonators in the uniform array that leaks the otherwise uncoupled mode to free space and exhibits an inverse quadratic relationship between quality factor (Q) and asymmetry. Here, we propose a scheme to further reduce scattering losses and improve the robustness of symmetry-protected BICs by decreasing the radiation density with a hybrid BIC lattice. We observe a significant increase of radiative Q in the hybrid lattice compared to the uniform lattice with a factor larger than 14.6. In the hybrid BIC lattice, modes are transferred to Г point inherited from high symmetric X, Y, and M points in the Brillouin zone that reveal as multiple Fano resonances in the far field and would find applications in hyperspectral sensing. This work initiates a novel and generalized path toward reducing scattering losses and improving the robustness of BICs in terms of lattice engineering that would release the rigid requirements of fabrication accuracy and benefit applications of photonics and optoelectronic devices.
bound states in the continuum metasurfaces terahertz photonics radiative losses Fano resonances 
Opto-Electronic Science
2023, 2(4): 230006
丛龙庆 *†许桂珍 1†
作者单位
摘要
南方科技大学工学院电子与电气工程系,广东 深圳 518055
基于连续域内束缚态(BIC)的超表面具备在时间和空间上实现高效光场调控的能力。在时间维度上,BIC理论上可实现无穷长的辐射光子寿命,因此在激光谐振腔、非线性光学、传感等领域展现了极好的应用价值。为深入理解BIC及衍生谐振特性,基于双开口金属谐振器构成的杂化BIC超表面,探讨由于能带折叠引起的折叠谐振与准BIC谐振之间的特性。利用数值模拟、多极子分析和太赫兹光谱实验验证环形偶极子在这两类谐振辐射特性中的重要作用。此外,通过对比两种不同能带折叠方式的超晶格,进一步确认环形偶极子对折叠谐振品质因数的调制特性。深入理解谐振中多极子的散射特性对获取高品质因数谐振腔具有重要作用,为切实推动超表面在太赫兹传感、调制器和非线性相互作用等领域的应用奠定理论基础。
连续域束缚态 环形偶极子 超表面 多极子分析 太赫兹 bound states in the continuum toroidal dipole metasurfaces multipolar analysis terahertz 
激光与光电子学进展
2023, 60(18): 1811021
Author Affiliations
Abstract
1 Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University, and Key Laboratory of Optoelectronics Information and Technology, Ministry of Education, Tianjin 300072, China
2 Nonlinear Physics Centre, Australian National University, Canberra, ACT 2601, Australia
3 Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China
4 School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA
5 e-mail: gjq@tju.edu.cn
6 e-mail: Quanlong.Yang@anu.edu.au
7 e-mail: conglq@sustech.edu.cn
8 e-mail: weili.zhang@okstate.edu
Metasurface-empowered bound state in the continuum (BIC) provides a unique route for fascinating functional devices with infinitely high quality factors. This method is particularly attractive to the terahertz community because it may essentially solve the deficiencies in terahertz filters, sensors, lasers, and nonlinear sources. However, most BIC metasurfaces are limited to specified incident angles that seriously dim their application prospects. Here, we propose that a dual-period dielectric metagrating can support multiple families of BICs that originate from guided mode resonances in the dielectric grating and exhibit infinite quality factors at arbitrarily tilted incidence. This robustness was analyzed based on the Bloch theory and verified at tilted incident angles. We also demonstrate that inducing geometric asymmetry is an efficient way to manipulate the leakage and coupling of these BICs, which can mimic the electromagnetically induced transparency (EIT) effect in our dual-period metagrating. In this demonstration, a slow-light effect with a measured group delay of 117 ps was achieved. The incidence-insensitive BICs proposed here may greatly extend the application scenarios of the BIC effect. The high Q factor and outstanding slow-light effect in the metagrating show exciting prospects in realizing high-performance filters, sensors, and modulators for prompting terahertz applications.
Photonics Research
2022, 10(3): 03000810
作者单位
摘要
南方科技大学工学院电子与电气工程系, 广东 深圳 518055

主要总结了目前利用超材料与不同的材料或者技术结合实现太赫兹波动态调制器件的研究进展。太赫兹波动态调制器件的功能性来源于超材料,其动态响应机制则来源于器件集成的材料和外加驱动。基于超材料对局域电场的多阶增强效应,这种复合式调制器可以实现更低的调制能量消耗、更大的调制深度、更快的调制速度和更丰富的功能。本文以不同的材料或者技术为基础进行分类阐述,分别介绍了太赫兹波动态调制器件的基本调制原理、主要性能参数、驱动方式和研究进展。

材料 超材料 太赫兹 调制器 主动式器件 液晶 微机电系统 半导体 石墨烯 materials metamaterial terahertz modulators active devices liquid crystals MEMS semiconductors graphene 
中国激光
2021, 48(19): 1914003
Author Affiliations
Abstract
1 Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University, and the Key Laboratory of Optoelectronics Information and Technology Tianjin, Ministry of Education of China, Tianjin 300072, China
2 Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
3 Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
4 Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
5 School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA
6 e-mail: weili.zhang@okstate.edu
Polarization manipulation is essential in developing cutting-edge photonic devices ranging from optical communication displays to solar energy harvesting. Most previous works for efficient polarization control cannot avoid utilizing metallic components that inevitably suffer from large ohmic loss and thus low operational efficiency. Replacing metallic components with Mie resonance-based dielectric resonators will largely suppress the ohmic loss toward high-efficiency metamaterial devices. Here, we propose an efficient approach for broadband, high-quality polarization rotation operating in transmission mode with all-dielectric metamaterials in the terahertz regime. By separating the orthogonal polarization components in space, we obtain rotated output waves with a conversion efficiency of 67.5%. The proposed polarization manipulation strategy shows impressive robustness and flexibility in designing metadevices of both linear- and circular-polarization incidences.
Photonics Research
2018, 6(11): 11001056

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