Tunable Mid-Infrared Localized Surface Plasmon Resonances in Silicon Nanowires

被引：73

作者：

Chou, Li-Wei ^{[1
]}

Shin, Naechul ^{[1
]}

Sivaram, Saujan V. ^{[1
]}

Filler, Michael A. ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2012年 / 134卷 / 39期

基金：

美国国家科学基金会;

关键词：

INFRARED-ABSORPTION; CU2-XSE NANOCRYSTALS; GOLD NANOPARTICLES; OPTICAL-ABSORPTION; OXIDE NANOCRYSTALS; NANOSTRUCTURES; SIMULATION; GROWTH; ARRAYS;

D O I：

10.1021/ja3075902

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We observe and systematically tune an intense mid-infrared absorption mode that results from phosphorus doping in silicon nanowires synthesized via the vapor-liquid-solid technique. The angle- and shape-dependence of this spectral feature, as determined via in-situ transmission infrared spectroscopy, supports its assignment as a longitudinal localized surface plasmon resonance (LSPR). Modulation of resonant frequency (740-1620 cm(-1)) is accomplished by varying nanowire length (135-1160 nm). The observed frequency shift is consistent with Mie-Gans theory, which indicates electrically active dopant concentrations between 10(19) and 10(20) cm(-3). Our findings suggest new opportunities to confine light in this ubiquitous semiconductor and engineer the optical properties of nontraditional plasmonic materials.

引用

页码：16155 / 16158

页数：4

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