Subwavelength focusing in the near field in mesoscale air-dielectric structures

Pei Kuen Wei*, Hsieh Li Chou, Yi-Chun Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Subwavelength focusing in mesoscale structures was measured in the near field. Specifically, we found that plane waves form focused beams in higher topographic regions when they propagate through mesoscale transparent air-dielectric structures. By finite-difference time-domain simulations we verified that light diffracted off topographic edges and its convergence at higher topographic regions are the mechanisms for focus. This subwavelength focusing effect provides a simple way for mass production of mesoscale periodic structures. We made subwavelength gratings and hole arrays to demonstrate their feasibility.

Original languageEnglish
Pages (from-to)433-435
Number of pages3
JournalOptics Letters
Issue number5
StatePublished - 1 Mar 2004

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