Image enhancement in near-field scanning optical microscopy with laser-trapped metallic particles

被引：41

作者：

Gu, M ^{[1
]}

Ke, PC ^{[1
]}

机构：

[1] Victoria Univ Technol, Optoelect Imaging Grp, Sch Commun & Informat, Melbourne, Vic 8001, Australia

来源：

OPTICS LETTERS | 1999年 / 24卷 / 02期

关键词：

D O I：

10.1364/OL.24.000074

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A trapped-particle near-field scanning optical microscope is constructed by use of submicrometer- or micrometersized metallic particles (gold and silver) to increase scattering efficiency. The image contrast of the evanescent-wave interference pattern on the surface of a prism upon total internal reflection, obtained with trapped gold particles of diameter 0.1 and 2 mu m, is improved by a factor of approximately 2 and 1.5, respectively, compared with that obtained with trapped polystyrene particles of similar size. The use of a 2-mu m gold particle leads to image contrast that is approximately three times as great as that obtained with a 0.1-mu m gold particle, and interference patterns of a subwavelength period are obtained in both cases. (C) 1999 Optical Society of America.

引用

页码：74 / 76

页数：3

共 14 条

[1] Optical trapping of metallic particles by a fixed Gaussian beam [J].