Optimizing Electromagnetic Hotspots in Plasmonic Bowtie Nanoantennae

被引：146

作者：

Dodson, Stephanie ^{[1
]}

Haggui, Mohamed ^{[2
]}

Bachelot, Renaud ^{[2
]}

Plain, Jerome ^{[2
]}

Li, Shuzhou ^{[3
]}

Xiong, Qihua ^{[1
,4
]}

机构：

[1] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore

[2] Univ Technol Troyes, ICD, Lab Nanotechnol & Instrumentat Opt, Troyes, France

[3] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore

[4] Nanyang Technol Univ, Sch Elect & Elect Engn, Div Microelect, Singapore 639798, Singapore

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2013年 / 4卷 / 03期

基金：

新加坡国家研究基金会;

关键词：

ENHANCED RAMAN-SCATTERING; DISCRETE-DIPOLE APPROXIMATION; SILVER NANOPARTICLES; OPTICAL-PROPERTIES; SPECTROSCOPY; SIZE; SPOTS; SHAPE; SERS; HOT;

D O I：

10.1021/jz302018x

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Sensitivity is a key factor in the improvement of nanoparticle-based biosensors. Bowtie nanoantennae have shown high sensitivity for both surface-enhanced Raman scattering (SERS)- and localized surface plasmon resonance (LSPR)-based biosensing. In this work, optical bowtie nanoantennae with varying geometries were simulated, fabricated, and characterized. We successfully fabricated sub-5 nm gaps between prisms. The gap between prisms, the prism size, and the radius of curvature of the prism corners were characterized for their effects on the optical and electromagnetic properties. Bowties were characterized using LSPR, SERS, and photochemical near-field imaging. The results indicate that the radius of curvature of the prism corners has an important effect on the SERS abilities of a nanoparticle array. The trends described herein can be utilized to intelligently design highly sensitive SERS and LSPR biosensing substrates.

引用

页码：496 / 501

页数：6

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