Millivolt Modulation of Plasmonic Metasurface Optical Response via Ionic Conductance
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...
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Published in | Advanced materials (Weinheim) Vol. 29; no. 31 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
United States
Wiley
14.06.2017
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Subjects | |
Online Access | Get full text |
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Summary: | 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-1, provides a new approach to use of ionic transport for electrical control over light–matter interactions. |
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Bibliography: | USDOE Office of Science (SC), Basic Energy Sciences (BES) FG02-07ER46405; FA9550-12-1-0024; DE‐FG02‐07ER46405 Air Force Office of Scientific Research (AFOSR) (United States) |
ISSN: | 0935-9648 1521-4095 |