Intensity distribution of light emitted from a fiber tip mapped by short surface acoustic wave pulses

被引：0

作者：

Shen, YC ^{[1
]}

Hess, P ^{[1
]}

机构：

[1] Univ Heidelberg, Inst Phys Chem, D-69120 Heidelberg, Germany

来源：

ULTRAMICROSCOPY | 1998年 / 71卷 / 1-4期

关键词：

near-field fiber optics; field distribution; surface acoustic waves (SAWs);

D O I：

10.1016/S0304-3991(97)00076-4

中图分类号：

TH742 [显微镜];

学科分类号：

摘要：

Laser generation of short surface acoustic wave (SAW) pulses with a fiber tip is demonstrated, In the experiments, a tapered optical fiber tip was used to guide the 532 nm radiation of a Nd:YAG laser with 180 ps pulse duration to the surface to be investigated. Due to the increasing spatial confinement of the laser radiation with decreasing tip-sample distance, SAW pulses with frequency components up to 1 GHz were excited in an aluminum film deposited on a quartz substrate. It is shown that thermoelastic excitation of elastic surface wave pulses provides a new tool for studying the spatial intensity distribution of the exciting laser light emanating from the aperture of a near-field optical device as a function of distance. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：225 / 229

页数：5