Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-02-12
Optics Express 15, 9166-9175 (2007).
Physics
Condensed Matter
Other Condensed Matter
6 pages, 7 figures in RevTex format
Scientific paper
10.1364/OE.15.009166
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.
Banyal Ravinder Kumar
Huang Jing-Ying
Lu Wei-Tao
Perry Chris H.
Sridhar Srinath
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