Strong influence of hole shape on extraordinary transmission through periodic arrays of subwavelength holes |
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| Authors: | Koerkamp K J Klein Enoch S Segerink F B van Hulst N F Kuipers L |
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| Institution: | Applied Optics Group, MESA+ Institute for Nanotechnology and Department of Science & Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. |
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| Abstract: | 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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