Dielectric versus topographic contrast in near-field microscopy

被引:69
作者
Martin, OJF
Girard, C
Dereux, A
机构
[1] UNIV FRANCHE COMTE, PHYS MOL LAB, URA 772 CNRS, F-25030 BESANCON, FRANCE
[2] UNIV BOURGOGNE, PHYS LAB, URA CNRS 1796, EQUIPE SUBMICRON, F-21004 DIJON, FRANCE
关键词
D O I
10.1364/JOSAA.13.001801
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Using a fully vectorial three-dimensional numerical approach (generalized field propagator, based on Green's tensor technique), we investigate the near-field images produced by subwavelength objects buried in a dielectric surface. We study the influence of the object index, size, and depth on the near field. We emphasize the similarity between the near field spawned by an object buried in the surface (dielectric contrast) and that spawned by a protrusion on the surface (topographic contrast). We show that a buried object with a negative dielectric contrast (i.e., with a smaller index than its surrounding medium) produces a near-field image that is reversed from that of an object with a positive contrast. (C) 1996 Optical Society of America.
引用
收藏
页码:1801 / 1808
页数:8
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