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Title: Nanometer-thick flat lens with adjustable focus

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.
Authors:
;  [1] ; ;  [2]
  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)
Publication Date:
OSTI Identifier:
22395450
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; LENSES; METALS; PHASE TRANSFORMATIONS; REFRACTIVE INDEX; TEMPERATURE DEPENDENCE; TEMPERATURE GRADIENTS; THICKNESS; THIN FILMS; VANADIUM OXIDES