Publication

Dynamically Reconfigurable Metadevice Employing Nanostructured Phase-Change Materials

by Zhihua Zhu, Philip G. Evans, Richard F. Haglund, Jason G. Valentine

Abstract 

Mastering dynamic free-space spectral control and modulation in the near-infrared (NIR) and optical regimes remains a challenging task that is hindered by the available functional materials at high frequencies. In this work, we have realized an efficient metadevice capable of spectral control by minimizing the thermal mass of a vanadium dioxide phasechange material (PCM) and placing the PCM at the feed gap of a bow-tie field antenna. The device has an experimentally measured tuning range of up to 360 nm in the NIR and a modulation depth of 33% at the resonant wavelength. The metadevice is configured for integrated and local heating, leading to faster switching and more precise spatial control compared with devices based on phase-change thin films. We envisage that the combined advantages of this device will open new opportunities for signal processing, memory, security, and holography at optical frequencies.

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Publication Citation

Nano Letters 2017 pp 4881-4886 September 27, 2017
DOI: 10.1021/acs.nanolett.7b01767

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