AI Article Synopsis

  • * Researchers developed an ultrafast tunable metasurface using gallium arsenide nanoparticles, achieving rapid changes in reflectance and resonance spectral shifts.
  • * This innovation allows for fast and efficient control of light properties, opening new possibilities for optical applications.

Article 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. Our findings thereby enable a versatile tool for ultrafast and efficient control of light using light.Metasurfaces are not adjustable after fabrication, and a critical challenge is to realise a technique of tuning their optical properties that is both fast and efficient. Here, Shcherbakov et al. realise an ultrafast tunable metasurface with picosecond-scale large absolute reflectance modulation at low pump fluences.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5432034PMC
http://dx.doi.org/10.1038/s41467-017-00019-3DOI Listing

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