Open AccessSuper-thin Mikaelian’s lens of small index as a beam compressor with an extremely high compression ratio
Author(s) -
Fei Sun,
Yang Gui,
Xiaochen Ge,
Sailing He
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.007328
Subject(s) - optics , beam (structure) , collimator , lens (geology) , metamaterial , refractive index , materials science , laser beam quality , gas compressor , refraction , beam expander , physics , laser beams , laser , thermodynamics
Based on a focusing Mikaelian's lens with small refraction index (0<n<<1), an optical device is designed as a super-thin optical beam compressor (e.g., thickness = 3λ0) with an extremely high beam compression ratio (more than 19:1). This device can also be used as a beam collimator or a cylindrical-to-plane wave convertor with a much higher transmissivity than a zero-index metamaterial slab. The output beam shows good directionality in both near field and far field. A metamaterial structure is also designed to realize this device and verify its performance with finite element method (FEM).