期刊
PLASMONICS
卷 5, 期 4, 页码 325-329出版社
SPRINGER
DOI: 10.1007/s11468-010-9147-6
关键词
Plasmonic lens; Metallic nanostructure; Diffraction and propagation
资金
- A*STAR (Agency for Science, Technology and Research), Singapore, under SERC [072 101 0023]
To experimentally demonstrate the subwavelength focusing of depth-tuned or non-depth-tuned plasmonic lenses, we first designed this type of lens using diffraction-coupling-angle based method, then fabricated the structure in gold thin film with focused ion beam, and finally characterized its focusing behavior using near-field scanning optical microscope. It is found that this type of lens has a resolution limit on the focal plane due to the field represented by angular spectrum having a cut-off frequency, while at the near field the lens has sub-diffraction limit focusing capability due to the existence of high-angular-frequency components in the field.
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