期刊
LASER & PHOTONICS REVIEWS
卷 10, 期 4, 页码 665-672出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.201600051
关键词
3D Luneburg lens; femtosecond laser direct writing; gradient refractive index; 3D ideal focus; metamaterials
资金
- National Natural Science Foundation of China (NSFC) [91323301, 61275171, 61205185, 61275048, 91123032, 61205194, 61475164]
- Ministry of Science and Technology of China under Basic Science Research Program [2010CB934103]
- International Cooperation Program [2010DFA01180]
- CAS-JSPS Joint Research Project [GJHZ1411]
A Luneburg lens is a fascinating gradient refractive index (GRIN) lens that can focus parallel light on a perfect point without aberration in geometrical optics. Constructing a three-dimensional (3D) Luneburg lens at optical frequencies is a challenging task due to the difficulty of fabricating the desired GRIN materials. Here, we present the practical implementation of a 3D Luneburg lens at optical frequencies. Such a 3D Luneburg lens is designed with GRIN 3D simple cubic metamaterial structures, and fabricated with dielectric metamaterials by femtosecond laser direct writing in the commercial negative-photoresist IP-L. Simulated and experimental results exhibit an interesting 3D ideal focus for the infrared light. The protocol for developing the 3D Luneburg lens with ideal focus would prompt the potential applications in integrated light-coupled devices and lab-on-chip integrated biological sensors based on infrared light.
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