Negative refraction and subwavelength focusing using photonic crystals
Author
Özbay, Ekmel
Aydın, Koray
Alıcı, Kamil Boratay
Güven, Kaan
Date
2005-01Source Title
Proceedings of SPIE - Integrated Optoelectronic Devices 2005 - Photonic Crystal Materials and Devices III
Print ISSN
0277-786X
Publisher
SPIE
Volume
5733
Pages
39 - 49
Language
English
Type
Conference PaperItem Usage Stats
241
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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.
Keywords
Negative refractionPhotonic crystal
Subwavelength resolution
Dielectric materials
Lenses
Light polarization
Light propagation
Light refraction
Optical resolving power
Permittivity
Photons
Refractive index
Negative refraction
Photonic bandgap
Photonic crystal
Subwavelength resolution
Crystals
Permalink
http://hdl.handle.net/11693/27380Published Version (Please cite this version)
https://doi.org/10.1117/12.582778Collections
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