Liquid Crystal Control of Plasmonic Nanoantenna Arrays

We demonstrate the active control of resonant plasmonic nanoantenna arrays. This demonstration is done with liquid crystals, surface lattice resonances and quasi-guided modes in aluminum nanoparticle arrays on top of waveguides acting as electrodes.</p

Liquid Crystal Control of Plasmonic Nanoantenna Arrays

We demonstrate the active control of resonant plasmonic nanoantenna arrays. This demonstration is done with liquid crystals, surface lattice resonances and quasi-guided modes in aluminum nanoparticle arrays on top of waveguides acting as electrodes.</p

Electric tuning and switching of the resonant response of nanoparticle arrays with liquid crystals

We report on the design, fabrication, and analysis of a tunable device combining nanoparticle arrays that support collective surface lattice resonances (SLRs) with liquid crystals (LCs). The optoelectronic tunability of the nematic LC and the dependency of sharp SLRs on the refractive index of the environment are exploited to achieve spectral tunability. This tunability is electrically controlled by switching between planar and homeotropic states in the LC, which allows for a rapid and reversible tuning of the SLR wavelength with a large degree of control. This device also offers the possibility to switch “on” and “off” the presence of a quasi-guided mode in the indium tin oxide electrode. The manipulation of these resonances with an external parameter can be used to expand the functionalities of plasmonic metasurface devices