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Proceedings Paper

Active chiral metamaterials for tunable modulation of chiroptical coupling and light-valley interactions (Conference Presentation)
Author(s): Zilong Wu; Yuebing Zheng

Paper Abstract

We demonstrate a novel moiré chiral metamaterial (MCM) with actively tunable and reversible optical chirality, which is enabled by the tunable Fano coupling and a solvent-controllable dielectric spacer in the MCM. Using an ultrathin MCM that is only 1/5 of the working wavelength in thickness, we have achieved the active spectral shift over more than one full width at half maximum and the sign inversion of the circular dichroism spectra. We have further applied the plasmon-enhanced chiral near-fields in the MCM to actively modulate the valley excitons in a monolayer semiconductor. With the large and controllable tunability in both far-field and near-field chiroptical responses, our metamaterials are promising for applications in chiral light modulators, ultrasensitive solvent sensors, and active valleytronic devices.

Paper Details

Date Published: 10 March 2020
Proc. SPIE 11289, Photonic and Phononic Properties of Engineered Nanostructures X, 112890T (10 March 2020); doi: 10.1117/12.2545348
Show Author Affiliations
Zilong Wu, The Univ. of Texas at Austin (United States)
Yuebing Zheng, The Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 11289:
Photonic and Phononic Properties of Engineered Nanostructures X
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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