Digital holographic microscopy characterization of superdirective beam by metamaterial

被引:24
作者
Di Caprio, Giuseppe [1 ]
Dardano, Principia [1 ]
Coppola, Giuseppe [1 ]
Cabrini, Stefano [2 ]
Mocella, Vito [1 ]
机构
[1] Natl Council Res CNR Unita Napoli, IMM, I-80131 Naples, Italy
[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94720 USA
关键词
NUMERICAL RECONSTRUCTION; PHOTONIC CRYSTALS; PROPAGATION; REFRACTION;
D O I
10.1364/OL.37.001142
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Digital holographic microscopy (DHM) has been successfully applied for the first time to characterize the radiative out-of-plane emission properties of a superdirective device. Complementarily to near-field microscopy, DHM allows us to reconstruct the beam in the far-field region. The angular dispersion of the light beam radiated from a grating composed of air and anti-air metamaterial has been determined, and the proposed technique has highlighted a collimation degree higher than 0.04 degrees, as already evaluated in a previous work. Further considerations on the retrieved phase map of the beam in the acquisition plane are presented. (C) 2012 Optical Society of America
引用
收藏
页码:1142 / 1144
页数:3
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