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Published March 15, 2008 | Published
Journal Article Open

Quantitative determination of optical transmission through subwavelength slit arrays in Ag films: Role of surface wave interference and local coupling between adjacent slits


Measurement of the transmitted intensity from a coherent monomode light source through a series of subwavelength slit arrays in Ag films, with varying array pitch and number of slits, demonstrates enhancement (suppression) by factors of as much as 6 (9) when normalized to the transmission efficiency of an isolated slit. Pronounced minima in the transmitted intensity are observed at array pitches corresponding to lambdaSPP, 2lambdaSPP, and 3lambdaSPP, where lambdaSPP is the wavelength of the surface plasmon polariton (SPP). The position of these minima arises from destructive interference between incident propagating waves and pi-phase-shifted SPP waves. Increasing the number of slits to four or more does not increase appreciably the per-slit transmission intensity. A simple interference model fits well the measured transmitted intensity profile.

Additional Information

© 2008 The American Physical Society. (Received 11 February 2008; published 7 March 2008) Support from the Caltech Kavli Nanoscience Institute, the National Science Foundation under Grant No. DMR 0606472 and the use of facilities at the Center for Science and Engineering of Materials, an NSF Materials Research Science and Engineering Center at Caltech, are gratefully acknowledged. Support from the Ministère délégué à l'Enseignement Supérieur et à la Recherche under the programme ACI-"Nanosciences-Nanotechnologies," the Région Midi-Pyrénées (SFC/CR 02/22), and FASTNet (HPRN-CT-2002-00304) EU Research Training Network, as well as from the research foundation FAPESP of the State of São Paulo, Brazil is also gratefully acknowledged.

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