Imaging by flat lens using negative refraction
Authors:
- Wentao T. LuWLWentao T. Lu
- Plarenta VodoPVPlarenta Vodo
- Srinivas SridharSSSrinivas Sridhar
Top Cited Papers
- 27 November 2003
- journal article
- Published by Springer Nature in Nature
- Vol. 426 (6965) , 404
Abstract
The positive refractive index of conventional optical lenses means that they need curved surfaces to form an image, whereas a negative index of refraction allows a flat slab of a material to behave as a lens and focus electromagnetic waves to produce a real image. Here we demonstrate this unique feature of imaging by a flat lens, using the phenomenon of negative refraction in a photonic crystalline material. The key advance that enabled us to make this observation lies in the design of a photonic crystal with suitable dispersion characteristics to achieve negative refraction over a wide range of angles.Keywords
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