光学技术, 2019, 45 (5): 635, 网络出版: 2020-01-07
基于共轭梯度算法的光谱合成超构表面设计
Design of metasurface for spectral synthesis based on conjugate gradient algorithm
超构表面 共轭梯度算法 光谱合成 空间滤波 nano-photonic devices conjugate gradient algorithm spectral synthesis spatial filtering
摘要
在研究基于硅基二氧化钛纳米柱对空间光场位相调制特性的基础上, 结合菲涅尔衍射理论, 提出了一种基于共轭梯度优化算法的超构表面设计方法。通过该方法, 在可见光波段能够实现在任意衍射角度上对选取的波长进行滤波。衍射角分别为15°和30°, 波长范围在400～780nm, 对RGB三色光波进行单波长滤波。数值模拟结果验证表明, 所提算法得到的超构表面能在预定的衍射角下准确地产生目标强度谱。
Abstract
Based on the phase modulation of spatial light field by silica-based titanium dioxide nano-pillars and fresnel diffraction theory, a metasurface design method based on conjugate gradient optimization algorithm is proposed. The selected wavelength can be filtered at any diffraction angle in the visible band by this algorithm. At diffraction angles of 15° and 30°, in the wavelength range of 400～780nm, single-wavelength filtering on the wavelength of RGB has been performed. The numerical simulation results show that the metasurface obtained by this algorithm can accurately generate the target intensity spectrum at a predetermined diffraction angle.
刘胜楠, 胡滨, 刘娟. 基于共轭梯度算法的光谱合成超构表面设计[J]. 光学技术, 2019, 45(5): 635. LIU Shengnan, HU Bin, LIU Juan. Design of metasurface for spectral synthesis based on conjugate gradient algorithm[J]. Optical Technique, 2019, 45(5): 635.
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