Ultrafast all-optical tuning of direct-gap semiconductor metasurfaces

Maxim R. Shcherbakov (), Sheng Liu, Varvara V. Zubyuk, Aleksandr Vaskin, Polina P. Vabishchevich, Gordon Keeler, Thomas Pertsch, Tatyana V. Dolgova, Isabelle Staude, Igal Brener and Andrey A. Fedyanin
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Maxim R. Shcherbakov: Lomonosov Moscow State University
Sheng Liu: Sandia National Laboratories
Varvara V. Zubyuk: Lomonosov Moscow State University
Aleksandr Vaskin: Friedrich Schiller University Jena
Polina P. Vabishchevich: Lomonosov Moscow State University
Gordon Keeler: Sandia National Laboratories
Thomas Pertsch: Friedrich Schiller University Jena
Tatyana V. Dolgova: Lomonosov Moscow State University
Isabelle Staude: Friedrich Schiller University Jena
Igal Brener: Sandia National Laboratories
Andrey A. Fedyanin: Lomonosov Moscow State University

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Optical metasurfaces are regular quasi-planar nanopatterns that can apply diverse spatial and spectral transformations to light waves. However, metasurfaces are no longer adjustable after fabrication, and a critical challenge is to realise a technique of tuning their optical properties that is both fast and efficient. We experimentally realise an ultrafast tunable metasurface consisting of subwavelength gallium arsenide nanoparticles supporting Mie-type resonances in the near infrared. Using transient reflectance spectroscopy, we demonstrate a picosecond-scale absolute reflectance modulation of up to 0.35 at the magnetic dipole resonance of the metasurfaces and a spectral shift of the resonance by 30 nm, both achieved at unprecedentedly low pump fluences of less than 400 μJ cm–2. Our findings thereby enable a versatile tool for ultrafast and efficient control of light using light.

Date: 2017
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DOI: 10.1038/s41467-017-00019-3

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