基于GaP光子晶体的平板超透镜设计与研究  

Design and research of plate superlens based on GaP photonic crystal

作　　者：余越 申桐 张磬瀚 郑继红[1] YU Yue;SHEN Tong;ZHANG Qinghan;ZHENG Jihong(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《光学仪器》2023年第6期33-41,共9页Optical Instruments

基　　金：国家自然科学基金(61975122)。

摘　　要：超透镜是基于超表面对光场调控的成像器件,由于其具有体积小型化、工艺流程化的优势,在器件轻量化、便携性方面具有很好的应用前景。针对当前市场对透镜的体积需求,使用时域有限差分法模拟了一种新型结构的超透镜,它是基于光子晶体的平板超透镜,尺寸为长2µm,宽1µm,工作波长在717 nm可见光波段。该平板超透镜以TiO_(2)波导作为衬底,由Au和GaP两组周期相同的光子晶体呈相切的结构共同蚀刻在TiO_(2)波导上,模拟研究透镜成像效果。此外通过引入一系列不同形状的缺陷,研究其对平板透镜成像结果的影响,结果表明,当缺陷结构为矩形尺寸:Lx=0.5µm,Ly=0.8µm时,该平板超透镜呈现出最好的成像效果,达到了0.556λ数值的超分辨,极大地提高了成像质量。未来该平板超透镜在可便携的成像设备,AR,VR以及小型医疗设备等各个领域具有极大的发展潜力。Superlens is an imaging device based on metasurface photoregulation.Due to its advantages of miniaturization and process,it has a good application prospect in the aspects of lightweight and portability.In order to meet the demand of lens volume in the current market,a new type of superlens is simulated by using the finite-difference time-domain method.It is a flat plate superlens based on photonic crystal.The size is 2μm×1μm,and its working wavelength is in the visible light band of 717 nm.In this design,TiO_(2) waveguide was used as the substrate for the plate superlens design.Two groups of Au and GaP photonic crystals with the same period are etched on the TiO_(2) waveguide,and the imaging performance of the lens is simulated and studied.In addition,by introducing a series of defects with different shapes,the imaging performance of the plate lens is analyzed.The results show that when the defect structure is a rectangular size of Lx=0.5μm,Ly=0.8μm,the plate superlens presents the best imaging performance and reaches the value of 0.556λsuper-resolution,which greatly improves the imaging quality.The flat superlens has great potential in portable imaging devices,AR,VR,and small medical devices in the future.

关 键 词：超透镜 时域有限差分法 超分辨 光子晶体 衍射极限 

分 类 号：O43[机械工程—光学工程]