A new mechanism for negative refraction and focusing using selective diffraction from surface corrugation

Title:
A new mechanism for negative refraction and focusing using selective diffraction from surface corrugation
Creator:
Lu, W. T. (Author)
Huang, Y. J. (Author)
Vodo, P. (Author)
Banyal, R. K. (Author)
Perry, C. H. (Author)
Sridhar, S. (Author)
Language:
English
Publisher:
January 01, 2007
Type of resource:
Text
Genre:
Texts
Format:
electronic
Digital origin:
born digital
Abstract/Description:
Refraction at a smooth interface is accompanied by momentum transfer normal to the interface. We show that corrugating an initially smooth, totally reflecting, non-metallic interface provides a momentum kick parallel to the surface, which can be used to refract light negatively or positively. This new mechanism of negative refraction is demonstrated by visible light and microwave experiments on grisms (grating-prisms). Single-beam all-angle-negative-refraction is achieved by incorporating a surface grating on a flat multilayered material. This negative refraction mechanism is used to create a new optical device, a grating lens. A plano-concave grating lens is demonstrated to focus plane microwaves to a point image. These results show that customized surface engineering can be used to achieve negative refraction even though the bulk material has positive refractive index. The surface periodicity provides a tunable parameter to control beam propagation leading to novel optical and microwave devices.
Comments:
Originally posted at http://arxiv.org/abs/cond-mat/0702286v1. Preprint of an article posted in Optics Express, v.15, 2007.
Subjects and keywords:
Negative refraction
Condensed matter
Momentum transfer
selective diffraction
surface corrugation
Physics
Permanent Link:
http://hdl.handle.net/2047/d20000360

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