Giant near-field optical enhancement with subnanometer tip-sample distance sensitivity

被引：0

作者：

Martinez, O.E. ^{[1
]}

Bragas, A.V. ^{[1
]}

Lester, Marcelo ^{[1
]}

机构：

[1] Univ de Buenos AiresPabellon, Buenos Aires, Argentina

来源：

Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series | 2000年

关键词：

Gas lasers - Graphite - Laser beams - Light polarization - Light scattering - Photodiodes;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Bargas et al. (1998) have shown a giant optical field enhancement at the tip-sample junction of a scanning tunneling microscope. The magnitude of the field enhancement obtained is larger than expected from abundant calculation performed for different tip-sample geometries. In this work, it is shown that when the metallic tip approached to a sample to subnanometer distances, and it is shinned with light, the field enhancement at the tip is increased by a resonant mechanism, yielding light scattering signals extremely sensitive to the tip-sample distance. Experimental results indicate subnanometer sensitivity and a model is given, consistent with the results.

引用

页码：61 / 62