Nanometer-thick flat lens with adjustable focus
- Département de Physique et d'Astronomie, Université de Moncton, Moncton, New Brunswick, E1A 3E9 (Canada)
- Centre Optique, Photonique et Laser (COPL) and Pavillon d'Optique-Photonique, Université Laval, Québec, Québec G1V 0A6 (Canada)
We report laser beam focusing by a flat, homogeneous film with a thickness of less than 100 nm. The effect relies on refractive index changes occurring in vanadium dioxide as it undergoes a phase transition from insulator to metal. Phase front curvature is achieved by means of temperature gradients, and adjustable focal lengths from infinity to 30 cm are attained.
- OSTI ID:
- 22395450
- Journal Information:
- Applied Physics Letters, Vol. 105, Issue 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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