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

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


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.

Original languageEnglish
Article number233106
JournalApplied Physics Letters
Issue number23
Publication statusPublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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