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Phys Rev Lett. 2004 May 7;92(18):183901. Epub 2004 May 4.

Strong influence of hole shape on extraordinary transmission through periodic arrays of subwavelength holes.

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  • 1Applied Optics Group, MESA+ Institute for Nanotechnology and Department of Science & Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.


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 (approximately 2500 cm(-1)). A comparison with the transmission of isolated holes shows that shape resonances of the rectangular holes play a dominant role.

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