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Light-driven tunable dual-band plasmonic absorber using liquid-crystal-coated asymmetric nanodisk array
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Image of FIG. 1.
FIG. 1.

(Color online) (a) Schematic of light-driven tunable plasmonic absorber. Light-sensitive liquid crystals on top of the absorber can be modulated with light. (b) The top layer consists of two sets of alternatively arranged, two-dimensional nanodisks with the same period and different diameters, followed by a spacing layer of SiO2 and a bottom gold layer. (c) SEM images of fabricated near perfect plasmonic absorber working at dual frequencies.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Two designs of the near-perfect plasmonic absorber (i) a = 300 nm, b = 200 nm, and (ii) a = 280 nm, b = 180 nm. FDTD simulations show that near perfect absorption can be achieved at selected wavelength ranges. (b) Experiment results of the two designs. Over 90% absorbing efficiencies can be achieved.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Experimental setup for measuring optically tunable plasmonic absorber. (b) FDTD-simulated results of the performance of the Liquid crystal-plasmonic absorber. Around 30 nm shift can be observed. (c) Measured absorption band shifts with the pumping light turning ON and OFF. (d) Zoom-in view of the left absorption dip. The shift is around 25 nm. (e) Zoom-in view of the second absorption dip. The shift is around 20 nm.


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Scitation: Light-driven tunable dual-band plasmonic absorber using liquid-crystal-coated asymmetric nanodisk array