Nanometer-thick flat lens with adjustable focus

Journal Article · Mon Dec 08 00:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4903887· OSTI ID:22395450

Son, T. V.; Haché, A. ^[1]; Ba, C. O. F.; Vallée, R. ^[2]

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1. Département de Physique et d'Astronomie, Université de Moncton, Moncton, New Brunswick, E1A 3E9 (Canada)
2. 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

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
LENSES
METALS
PHASE TRANSFORMATIONS
REFRACTIVE INDEX
TEMPERATURE DEPENDENCE
TEMPERATURE GRADIENTS
THICKNESS
THIN FILMS
VANADIUM OXIDES