Optical field enhancement of nanometer-sized gaps at near-infrared frequencies

被引：28

作者：

Ahn, Jae Sung ^{[1
,2
]}

Kang, Taehee ^{[1
,2
]}

Singh, Dilip K. ^{[1
,2
]}

Bahk, Young-Mi ^{[1
,2
]}

Lee, Hyunhwa ^{[3
]}

Choi, Soo Bong ^{[3
]}

Kim, Dai-Sik ^{[1
,2
]}

机构：

[1] Seoul Natl Univ, Ctr Subwavelength Opt, Seoul 151747, South Korea

[2] Seoul Natl Univ, Dept Phys & Astron, Seoul 151747, South Korea

[3] Incheon Natl Univ, Dept Phys, Inchon 406772, South Korea

来源：

OPTICS EXPRESS | 2015年 / 23卷 / 04期

基金：

新加坡国家研究基金会;

关键词：

QUANTUM PLASMON RESONANCES; RAMAN-SCATTERING; NANOPARTICLES; LIGHT; ARRAYS; APERTURES; JUNCTIONS; NANOGAP;

D O I：

10.1364/OE.23.004897

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report near-field and far-field measurements of transmission through nanometer-sized gaps at near-infrared frequencies with varying the gap size from 1 nm to 10 nm. In the far-field measurements, we excluded direct transmission on the metal film surface via interferometric method. Kirchhoff integral formalism was used to relate the far-field intensity to the electric field at the nanogaps. In near-field measurements, field enhancement factors of the nanogaps were quantified by measuring transmission of the nanogaps using near-field scanning optical microscopy. All the measurements produce similar field enhancements of about ten, which we put in the context of comparing with the giant field enhancements in the terahertz regime. (C) 2015 Optical Society of America

引用

页码：4897 / 4907

页数：11

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