Journal
NANO LETTERS
Volume 21, Issue 1, Pages 330-336Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03723
Keywords
Tunable metasurface; metallic quantum wells; beam steering; hologram
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Funding
- Defense Advanced Research Projects Agency (DARPA) DSO-NLM Program [HR00111820038]
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This research introduces and experimentally demonstrates a Kerr metasurface with strong intensity-dependent responses, which can achieve nonlinear effects by changing the optical properties of metallic quantum wells. This metasurface shows potential for applications in the field of nonlinear optics.
Optical metasurfaces have emerged as promising candidates for multifunctional devices. Dynamically reconfigurable metasurfaces have been introduced by employing phase-change materials or by applying voltage, heat, or strain. While existing metasurfaces exhibit appealing properties, they do not express any significant nonlinear effects due to the negligible nonlinear responses from the typical materials used to build the metasurface. In this work, we propose and experimentally demonstrate one kind of Kerr metasurface that shows strong intensity-dependent responses. The Kerr metasurface is composed of a top layer of gold antennas, a dielectric spacer, and a ground layer of metallic quantum wells (MQWs). Because of the large Kerr nonlinearity supported by the MQWs, the effective optical properties of the MQWs can change from metallic to dielectric with increasing of the input intensity, leading to dramatic modifications of the metasurface responses. This opens up new routes for potential applications in the field of nonlinear optics.
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