Analysis of mode coupling due to spherical defects in ideal fully metal-coated scanning near-field optical microscopy probes

被引:9
作者
Nakagawa, W [1 ]
Vaccaro, L [1 ]
Herzig, HP [1 ]
机构
[1] Univ Neuchatel, Inst Microtechnol, CH-2000 Neuchatel, Switzerland
关键词
D O I
10.1364/JOSAA.23.001096
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We investigate the effect of defects in the metal-coating layer of a scanning near-field optical microscopy (SNOM) probe on the coupling of polarization modes using rigorous electromagnetic modeling tools. Because of practical limitations, we study an ensemble of simple defects to identify important trends and then extrapolate these results to more realistic structures. We find that a probe with many random defects will produce a small but significant coupling of energy between a linearly polarized input mode and a radial/longitudinal polarization mode, which is known to produce a strongly localized emitted optical field and is desirable for SNOM applications. (C) 2006 Optical Society of America.
引用
收藏
页码:1096 / 1105
页数:10
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