Effect of nanohole spacing on the self-imaging phenomenon created by the three-dimensional propagation of light through periodic nanohole arrays

Mustafa H. Chowdhury, Nathan C. Lindquist, Antoine Lesuffleur, Sang Hyun Oh, Joseph R. Lakowicz, Krishanu Ray

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We present a detailed study of the inter-nanohole distance that governs the self-imaging phenomenon created by the three-dimensional propagation of light through periodic nanohole arrays on plasmonic substrates. We used scanning near-field optical microscopy (SNOM) to map the light intensity distributions at various heights above 10 × 10 nanohole arrays of varying pitch sizes on silver films. Our results suggest the interhole spacing has to be greater than the wavelength of the incident light to create the self-imaging phenomenon. We also present finite-difference time-domain (FDTD) calculations which show qualitative corroboration of our experimental results. Both our experimental and FDTD results show that the self-imaging phenomenon is more pronounced for structures with larger pitch sizes. We believe this self-imaging phenomenon is related to the Talbot imaging effect that has also been modified by a plasmonic component and can potentially be used to provide the basis for a new class of optical microscopes.

Original languageEnglish (US)
Pages (from-to)19958-19967
Number of pages10
JournalJournal of Physical Chemistry C
Volume116
Issue number37
DOIs
StatePublished - Sep 20 2012

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