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

来源：

OPTICS LETTERS | 2012年 / 37卷 / 07期

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

页码：1142 / 1144

页数：3

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