Subwavelength nondiffraction beam generated by a plasmonic lens

Ding Zheng Lin, Chih Hao Chen, Chin Kai Chang, Tsung Dar Cheng, Chau Shioung Yeh, Chih Kung Lee

研究成果: Article同行評審

32 引文 斯高帕斯(Scopus)

摘要

We experimentally examined the near-field and far-field optical properties of a subwavelength annular aperture (SAA) made on silver film and undertook finite difference time domain simulations. In our near-field measurements, an interference pattern with a period very close to half of the surface plasmon (SP) wavelength (λSP 2) was found on the surface of the silver film. Moreover, we observed that the transmitted light of the 442 nm incident laser was focused at several micrometers behind the silver SAA structure at a tiny spot (354 nm) and with a remarkable 31 μm depth of focus. This implies that the silver SAA structure can generate a nondiffraction beam and can be used to fabricate high aspect ratio subwavelength structures.

原文English
文章編號233106
期刊Applied Physics Letters
92
發行號23
DOIs
出版狀態Published - 2008

All Science Journal Classification (ASJC) codes

  • 物理與天文學(雜項)

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