Bioinspired lenses from cats' eyes  

作　　者：Shuwen Xue Chuanjie Hu Miao Zhang Huanyang Chen 薛淑雯;胡传捷;张淼;陈焕阳(Institute of Electromagnetics and Acoustics and Department of Physics,Xiamen University,Xiamen 361005,China)

机构地区：[1]Institute of Electromagnetics and Acoustics and Department of Physics,Xiamen University,Xiamen 361005,China

出　　处：《Chinese Optics Letters》2022年第1期127-132,共6页中国光学快报（英文版）

基　　金：supported by the National Key Research and Development Program of China (No. 2020YFA0710100);the National Science Foundation of China (Nos. 11874311 and 92050102);the Fundamental Research Funds for the Central Universities (No. 20720200074)

摘　　要：It is well known that cats have fascinating eyes with various colors,such as green,blue,and brown.In addition,they possess strong night vision ability,which can distinguish things clearly even in a poor light environment.These drive us to reveal the secrets behind them.In fact,cats’ eyes can be considered as special lenses(which we would like to mimic by using a Luneburg lens).We make an analysis of the role of photonic crystals behind the lens and demonstrate that the integration of photonic crystals into Luneburg lens can be regarded as a retroreflector and greatly improve the light focusing intensity of the lens in a broad band of frequencies.This wonderful bioinspired phenomenon is expected to design more interesting and serviceable devices by combining photonic crystals with transformation optics.

关 键 词：cats’eyes Luneburg lens tapetum lucidum photonic crystals 

分 类 号：TH74[机械工程—光学工程]