Intrinsic linewidth of the plasmonic resonance in a micrometric metal mesh

被引：4

作者：

Baldassarre, L. ^{[1
]}

Ortolani, M. ^{[2
,3
,4
]}

Nucara, A. ^{[2
,3
]}

Maselli, P. ^{[2
,3
]}

Di Gaspare, A. ^{[4
]}

Giliberti, V. ^{[4
]}

Calvani, P. ^{[2
,3
]}

机构：

[1] Ist Italiano Tecnol, Ctr Life NanoSci Sapienza, I-00185 Rome, Italy

[2] CNR SPIN, I-00185 Rome, Italy

[3] Univ Roma La Sapienza, I-00185 Rome, Italy

[4] CNR IFN, I-00156 Rome, Italy

来源：

OPTICS EXPRESS | 2013年 / 21卷 / 13期

关键词：

EXTRAORDINARY OPTICAL-TRANSMISSION; ARRAYS; SPECTROSCOPY; METAMATERIALS; FILMS;

D O I：

10.1364/OE.21.015401

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The intrinsic linewidth and angular dispersion of Surface Plasmon Polariton resonance of a micrometric metal mesh have been measured with a collimated mid-infrared beam, provided by an External Cavity tunable Quantum Cascade Laser. We show that the use of a collimated beam yields an observed resonance linewidth gamma = 12 cm(-1) at the resonance frequency nu(0) = 1658 cm-1, better by an order of magnitude than with a non-collimated beam. The extremely narrow plasmon resonance attained by our mesh is then exploited to reconstruct, by varying the QCL angle of incidence theta, the angular intensity distribution f(theta) of a globar at the focal plane of a conventional imaging setup. We thus show that f (theta) is better reproduced by a Gaussian distribution than by a uniform one, in agreement with ray-tracing simulation. (C) 2013 Optical Society of America

引用

页码：15401 / 15408

页数：8

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