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10 March 2020 Active chiral metamaterials for tunable modulation of chiroptical coupling and light-valley interactions (Conference Presentation)
Zilong Wu, Yuebing Zheng
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Proceedings Volume 11289, Photonic and Phononic Properties of Engineered Nanostructures X; 112890T (2020) https://doi.org/10.1117/12.2545348
Event: SPIE OPTO, 2020, San Francisco, California, United States
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.
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Zilong Wu and Yuebing Zheng "Active chiral metamaterials for tunable modulation of chiroptical coupling and light-valley interactions (Conference Presentation)", Proc. SPIE 11289, Photonic and Phononic Properties of Engineered Nanostructures X, 112890T (10 March 2020); https://doi.org/10.1117/12.2545348
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KEYWORDS
Modulation
Chiral metamaterials
Excitons
Dielectrics
Metamaterials
Semiconductors
Dichroic materials
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