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APS » Journals » Phys. Rev. Lett. » Volume 92 » Issue 18
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Phys. Rev. Lett. 92, 183901 (2004) [4 pages]

Strong Influence of Hole Shape on Extraordinary Transmission through Periodic Arrays of Subwavelength Holes

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K. J. Klein Koerkamp1, S. Enoch2, F. B. Segerink1, N. F. van Hulst1, and L. Kuipers1,3
1Applied Optics Group, MESA+ Institute for Nanotechnology and Department of Science & Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
2Institut Fresnel, CNRS 6133, Campus de St. Jérôme, case 161, 13397 Marseille Cedex 20, France
3FOM-Institute for Atomic and Molecular Physics (AMOLF), Kruislaan 407, 1098 SJ Amsterdam, The Netherlands

Received 7 March 2003; revised 4 November 2003; published 4 May 2004

We show that extraordinary light transmission of periodic subwavelength hole arrays, generally attributed to surface-plasmon resonances, is strongly influenced by the hole shape. Both experiments and calculations, based on a Fourier modal method, demonstrate that a shape change from circular to rectangular increases the normalized transmission by an order of magnitude while the hole area decreases. Moreover, the spectra exhibit large redshifts (∼2500  cm-1). A comparison with the transmission of isolated holes shows that shape resonances of the rectangular holes play a dominant role.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.183901
DOI:
10.1103/PhysRevLett.92.183901
PACS:
42.79.Dj, 71.36.+c, 73.20.Mf, 78.66.Bz
 
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