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Observation of Fabry-Pérot-type surface plasmon on Ag film with perforated short-range 3×3 hole array arranged in long-range periodic structure

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5 Author(s)
Chang, Yi-Tsung ; Department of Electrical Engineering, Graduate Institute of Electronics Engineering, National Taiwan University, Taipei, Taiwan 10617, Republic of China ; Chuang, Tzu-Hung ; Tsai, Ming-Wei ; Lai, Mu-Jen
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This letter elucidates enhanced optical transmission through a Ag film with perforated short-range 3×3 hole arrays arranged in a long-range periodic structure. The 3×3 squared hole array constitutes an individual microcell. The measured transmission peak wavelength reveals that the surface plasmons are generated by Fabry-Pérot-type waveguide resonances with integer order. The ratio of periodicity between the superperiodic structure p and the 3×3 microcell d determines the integer order. Namely, when p/d≫3, the order 3, 4, and 5 surface plasmon modes with average hole spacings p/3, p/4, and p/5 are observed. The transmission intensities of order 3 modes are the strongest, and those of order 5 modes are barely seen. But as p/d approaches 4, the order 3 modes gradually disappear with the emergence of order 4 and 5 modes. These phenomena suggest that the surface plasmons are Fabry-Pérot-type resonance within a super unit cell.

Published in:

Applied Physics Letters  (Volume:90 ,  Issue: 25 )

Date of Publication:

Jun 2007

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