Liu Feng, Dong Biqin, Zhao Fangyuan, Hu Xinhua, Liu Xiaohan, Zi Jian
Department of Physics, Surface Physics Laboratory, and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China.
Opt Express. 2011 Apr 11;19(8):7750-5. doi: 10.1364/OE.19.007750.
We report that a three-dimensional quasiordered photonic structure, found in the cuticles of beetle H. sexmaculata, can diffract light in a "wrong" way and its angular dispersion is about one order of magnitude larger than that of a conventional diffraction grating. A new diffraction type of photonic bandgap (from an anticrossing of longitudinal and transverse modes) and additional disorder effect are found to play important roles in this phenomenon. Mimicking the structure could lead to novel optical devices with ultralarge angular dispersion.
我们报道，在六斑异瓢虫的角质层中发现的一种三维准有序光子结构，能够以一种“反常”的方式衍射光，并且其角色散比传统衍射光栅大一个数量级左右。一种新的光子带隙衍射类型（源于纵向和横向模式的反交叉）以及额外的无序效应在这一现象中起着重要作用。模仿这种结构可能会带来具有超大角色散的新型光学器件。
