Abstract
We show a frequency tunable perfect absorber in visible and near-infrared regimes based on the vanadium dioxide () phase transition with a wide tuning capability typical of asymmetric Fabry–Perot (FP) cavities, comprising only an unpatterned, ultrathin () film of deposited on a metal-reflecting substrate. undergoes a structural transition from an insulating phase () to a metallic phase () at 68°C. A perfect absorption wavelength can be dynamically tuned over a wide wavelength range over 175 nm (from 905 to 730 nm in the measured spectrum) in visible and near-infrared regimes by controlling the temperature. More importantly, its absorption peaks become even stronger during the process of increasing temperature (from 96.8% at 905 nm to 98.4% at 730 nm). The frequency tunable absorption peaks were explained because both indices of and are very close to the maximum absorption point in parameter space.
© 2016 Optical Society of America
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