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Originally published in Science Express on 20 June 2002
Science 2 August 2002:
Vol. 297. no. 5582, pp. 820 - 822
DOI: 10.1126/science.1071895

Reports

Beaming Light from a Subwavelength Aperture

H. J. Lezec,1 A. Degiron,1 E. Devaux,1 R. A. Linke,2 L. Martin-Moreno,3 F. J. Garcia-Vidal,4 T. W. Ebbesen1*

Light usually diffracts in all directions when it emerges from a subwavelength aperture, which puts a lower limit on the size of features that can be used in photonics. This limitation can be overcome by creating a periodic texture on the exit side of a single aperture in a metal film. The transmitted light emerges from the aperture as a beam with a small angular divergence (approximately ±3°) whose directionality can be controlled. This finding is especially surprising, considering that the radiating region is mainly confined to an area with lateral dimensions comparable to the wavelength of the light. The device occupies no more than one cubic micrometer and, when combined with enhanced transmission, suggests that a wide range of photonic applications is possible.

1 ISIS, Louis Pasteur University, 4 rue B. Pascal, 67000 Strasbourg, France.
2 NEC Research Institute, 4 Independence Way, Princeton, NJ 08540, USA.
3 Departamento de Fisica de la Materia Condensada, ICMA-CSIC, Universidad de Zaragoza, 50015 Zaragoza, Spain.
4 Departamento de Fisica Teorica de la Materia Condensada, Universidad Autonoma de Madrid, 28049 Madrid, Spain.
*   To whom correspondence should be addressed. E-mail: ebbesen{at}isis-ulp.org


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