Near-field observation of plasmon excitation and propagation on ordered elliptical hole arrays

J. Y. Chu*, T. J. Wang, J. T. Yeh, M. W. Lin, You-Chia Chang, J. K. Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We report a near-field study of the excitation and propagation of surface plasmon on ordered Ag elliptical hole arrays with a scattering-type scanning near-field optical microscope. Strong dipole-like local plasmon is identified at each individual hole from near-field optical intensity and phase images. The excitation of the local plasmon at the elliptical hole is found to follow polarization excitation constraint. The coherent superposition of these local plasmon waves to form an extended surface plasmon wave propagating to an adjacent hole array is observed directly. The near-field results are consistent with the results obtained from far-field extraordinary transmission measurements.

Original languageEnglish
Pages (from-to)387-390
Number of pages4
JournalApplied Physics A: Materials Science and Processing
Volume89
Issue number2
DOIs
StatePublished - 1 Nov 2007

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