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Proceedings Paper

Negative refraction and subwavelength focusing using photonic crystals
Author(s): Ekmel Ozbay; Koray Aydin; K. B. Alici; Kaan Guven
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Paper Abstract

We review certain novel optical properties of two-dimensional dielectric photonic crystals (PCs) which exhibit negative refraction behavior. We investigate two mechanisms which utilize the band structure of the PC and lead to a negative effective index of refraction (neff < 0). The negative refraction phenomenon is demonstrated experimentally and by simulations when the incident beam couples to a photonic band with neff < 0. Further, the PC slab acts like a focusing lens to an omnidirectional source where the properties of focusing depends on the details of the band structure. In one case, by utilizing the TM polarized first band, an image of the source can be formed in the vicinity of the interface with subwavelength resolution. In another case, a TE polarized upper band is used which is able to focus the omnidirectional field far away from the interface with a resolution on par with the wavelength. In the latter case, we explicitly show the flat lens behavior of the structure. These examples indicate that PC based lenses can surpass limitations of conventional lenses and greatly enhance and extend optics applications.

Paper Details

Date Published: 13 April 2005
PDF: 11 pages
Proc. SPIE 5733, Photonic Crystal Materials and Devices III, (13 April 2005); doi: 10.1117/12.582778
Show Author Affiliations
Ekmel Ozbay, Bilkent Univ. (Turkey)
Koray Aydin, Bilkent Univ. (Turkey)
K. B. Alici, Bilkent Univ. (Turkey)
Kaan Guven, Bilkent Univ. (Turkey)

Published in SPIE Proceedings Vol. 5733:
Photonic Crystal Materials and Devices III
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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