Millivolt Modulation of Plasmonic Metasurface Optical Response via Ionic Conductance.
basic_science · Level V
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- Record sourced from PubMed, PMID 28612946.
- Also identified by DOI 10.1002/adma.201701044.
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Abstract
A plasmonic metasurface with an electrically tunable optical response that operates at strikingly low modulation voltages is experimentally demonstrated. The fabricated metasurface shows up to 30% relative change in reflectance in the visible spectral range upon application of 5 mV and 78% absolute change in reflectance upon application of 100 mV of bias. The designed metasurface consists of nanostructured silver and indium tin oxide (ITO) electrodes which are separated by 5 nm thick alumina. The millivolt-scale optical modulation is attributed to a new modulation mechanism, in which transport of silver ions through alumina dielectric leads to bias-induced nucleation and growth of silver nanoparticles in the ITO counter-electrode, altering the optical extinction response. This transport mechanism, which occurs at applied electric fields of 1 mV nm<sup>-1</sup> , provides a new approach to use of ionic transport for electrical control over light-matter interactions.