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Strongly frequency dependent focusing efficiency of a concave lens based on two-dimensional photonic crystals

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7 Author(s)
Foca, E. ; Chair for General Materials Science, Christian-Albrechts-University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany ; Foll, H. ; Carstensen, J. ; Sergentu, V.V.
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Results of an experimental study of a concave lens based on a two-dimensional microwave photonic crystal with neff≪1 are shown. We demonstrate that the lens focuses electromagnetic radiation for transverse electric (TE) and transverse magnetic (TM) polarizations. Intensity gains as high as 5.4 for TE polarization and 6.3 for TM polarization were achieved for definite frequencies lying in the explored interval from 6 to 15 GHz, the smallest area of the focal spot being equal to 0.24λ2 and 1.02λ2 for TE and TM polarizations respectively. The proposed lens serves as a model system that can be scaled to THz and optical frequencies.

Published in:

Applied Physics Letters  (Volume:88 ,  Issue: 1 )

Date of Publication:

Jan 2006

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