Volume 126, Number 6, June 2019
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||24 July 2019|
Light-induced optical switching in an asymmetric metal-dielectric microcavity with phase-change material
1 Wave Transport in Complex Systems Lab, Department of Physics, Wesleyan University Middletown, CT 06457, USA
2 Department of Physics and Astronomy, University of Texas at San Antonio - San Antonio, TX 78249, USA
3 Air Force Research Laboratory, Sensors Directorate - Wright-Patterson Air Force Base, OH 45433, USA
Received: 23 April 2019
Accepted: 25 June 2019
We propose an infrared power switch based on an asymmetric high-Q microcavity incorporating a metallic nanolayer in close proximity to a layer made of a phase-change material (PCM). The microcavity is designed so that when the PCM layer is in the low-temperature phase, the metallic nanolayer coincides with a nodal plane of the resonant electric-field component, to allow a high resonant transmittance. As the light intensity exceeds a certain threshold, light-induced heating of the PCM layer triggers the phase transition accompanied by an abrupt change in its refractive index in the vicinity of the transition temperature. The latter results in a shift of the nodal plane away from the metallic nanolayer, rendering the entire microcavity highly reflective over a broad frequency range. The nearly binary nature of the PCM refractive index allows for the low-intensity resonant transmission over a broad range of ambient temperatures below the transition point.
PACS: 42.79.-e – Optical elements, devices, and systems / 42.70.Qs – Photonic bandgap materials / 42.70.Nq – Other nonlinear optical materials; photorefractive and semiconductor materials
© EPLA, 2019
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