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APS » Journals » Phys. Rev. Lett. » Volume 92 » Issue 11
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Phys. Rev. Lett. 92, 113903 (2004) [4 pages]

Highly Directional Emission from Photonic Crystal Waveguides of Subwavelength Width

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P. Kramper1, M. Agio2, C. M. Soukoulis3,4, A. Birner5, F. Müller6, R. B. Wehrspohn6,7, U. Gösele6, and V. Sandoghdar8,*
1CNRS/LPN, route de Nozay, 91460 Marcoussis, France
2INFM-Dipartimento di Fisica “A. Volta,” Università degli Studi di Pavia, 27100 Pavia, Italy
3Research Center of Crete, Heraklion, Crete, Greece
4Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
5Infineon Technologies, Memory Products, Königsbrückerstrasse 180, 01099 Dresden, Germany
6Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany
7Nanophotonic Materials Group, Paderborn University, 33098 Paderborn, Germany
8Laboratory of Physical Chemistry, Swiss Federal Institute of Technology (ETH), CH-8093 Zurich, Switzerland

Received 24 July 2003; published 18 March 2004

See accompanying Physics Focus

Recently it has been shown that it is possible to achieve directional emission out of a subwavelength aperture in a periodically corrugated metallic thin film. We report on theoretical and experimental studies of a related phenomenon concerning light emitted from photonic crystal waveguides that are less than a wavelength wide. We find that the termination of the photonic crystal end facets and an appropriate choice of the wavelength are instrumental in achieving very low numerical apertures. Our results hold promise for the combination of photonic crystal waveguides with conventional optical systems such as fibers, waveguides, and freely propagating light beams.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.113903
DOI:
10.1103/PhysRevLett.92.113903
PACS:
42.70.Qs, 42.25.Fx, 42.82.Et

*To whom correspondence should be addressed.

Email address: vahid.sandoghdar@ethz.ch

 
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