Author Affiliations
Abstract
1 Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
2 Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China
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Nonscattering optical anapole condition is corresponding to the excitation of radiationless field distributions in open resonators, which offers new degrees of freedom for tailoring light-matter interaction. Conventional mechanisms for achieving such a condition relies on sophisticated manipulation of electromagnetic multipolar moments of all orders to guarantee superpositions of suppressed moment strengths at the same wavelength. In contrast, here we report on the excitation of optical radiationless anapole hidden in a resonant state of a Si nanoparticle utilizing a tightly focused radially polarized (RP) beam. The coexistence of magnetic resonant state and anapole condition at the same wavelength further enables the triggering of resonant state by a tightly focused azimuthally polarized (AP) beam whose corresponding electric multipole coefficient could be zero. As a result, high contrast inter-transition between radiationless anapole condition and ideal magnetic resonant scattering can be achieved experimentally in visible spectrum. The proposed mechanism is general which can be realized in different types of nanostructures. Our results showcase that the unique combination of structured light and structured Mie resonances could provide new degrees of freedom for tailoring light-matter interaction, which might shed new light on functional meta-optics.
anapole multipole decomposition all-dielectric nanoparticles Opto-Electronic Advances
2022, 5(4): 210014
1 中国科学院上海光学精密机械研究所薄膜光学实验室, 上海 201800
2 中国科学院大学材料与光电研究中心, 北京 100049
3 中国科学院强激光材料重点实验室, 上海 201800
4 中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室, 长春 130033
论述了全电介质纳米颗粒的光学性质,介绍了全电介质纳米颗粒的制备方法,分析了各种制备方法的优缺点,回顾了全电介质纳米颗粒在高折射率纳米谐振器、光学纳米天线、超材料和超表面、非线性纳米光子学等方面的应用,给出了全电介质纳米颗粒的研究重点及发展方向。
材料 全电介质纳米颗粒 电磁响应 介电常数 磁导率 激光与光电子学进展
2019, 56(9): 090004
中国科学院半导体研究所 集成技术工程研究中心，北京 100083
针对应用于薄膜太阳能电池的一种混合陷光结构进行了分析研究，该结构由位于电池正面的电介质颗粒和位于电池背面的金属颗粒构成.运用有限时域差分法模拟分析了正面电介质颗粒与背面金属颗粒对光吸收增强的不同作用范围.运用电场图分析了其对光吸收增强的机制，包括两种颗粒的散射作用和金属纳米颗粒的表面等离子体近场增强作用.分别优化了正面电介质颗粒和背面金属颗粒的材料、大小等参量，获得了一种优化后的混合陷光结构.实验表明带有这种混合陷光结构的电池短路电流密度相对于参考电池提高了30.3%，该方法为提高薄膜太阳能电池效率提供了新思路.
太阳能电池 混合陷光结构 时域有限差分法 电介质颗粒 金属颗粒 光吸收 模拟 Solar cells Hybrid light trapping structure Finite-difference time-domain method Dielectric nanoparticles Metal nanoparticles Light absorption Simulation
