Influence of film thickness on the optical transmission through subwavelength single slits in metallic thin films

被引：17

作者：

Ferri, Fabio A. ^{[1
]}

Rivera, Victor A. G. ^{[1
]}

Osorio, Sergio P. A. ^{[1
]}

Silva, Otavio B. ^{[1
]}

Zanatta, Antonio R. ^{[1
]}

Borges, Ben-Hur V. ^{[2
]}

Weiner, John ^{[1
]}

Marega, Euclydes, Jr. ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil

[2] Univ Sao Paulo, Dept Engn Eletrica, Escola Engn Sao Carlos, BR-13566590 Sao Carlos, SP, Brazil

来源：

APPLIED OPTICS | 2011年 / 50卷 / 31期

基金：

巴西圣保罗研究基金会;

关键词：

EVANESCENT-WAVE MODEL; HOLE ARRAYS; PERIODIC ARRAY; GOLD-FILMS; APERTURES; LIGHT;

D O I：

10.1364/AO.50.000G11

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Silver and gold films with thicknesses in the range of 120-450nm were evaporated onto glass substrates. A sequence of slits with widths varying between 70 and 270nm was milled in the films using a focused gallium ion beam. We have undertaken high-resolution measurements of the optical transmission through the single slits with 488.0nm (for Ag) and 632.8nm (for Au) laser sources aligned to the optical axis of a microscope. Based on the present experimental results, it was possible to observe that (1) the slit transmission is notably affected by the film thickness, which presents a damped oscillatory behavior as the thickness is augmented, and (2) the transmission increases linearly with increasing slit width for a fixed film thickness. (C) 2011 Optical Society of America

引用

页码：G11 / G16

页数：6

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