Experimental Investigation of Focusing of Gold Planar Plasmonic Lenses |
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Authors: | Jun Wang Wei Zhou |
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Institution: | (1) School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, 639798, Singapore |
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Abstract: | 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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Keywords: | |
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