Abstract
Optical modulators are key ingredients in optoelectronics applications ranging from energy harvesting, sensor and imaging devices. In this framework, nonlinear photon conversion mechanisms constitute an attractive opportunity to add logic capabilities to these apparatuses. Here, we investigate the directionality of the emitted second harmonic signal generated in a dielectric metasurface consisting of AlGaAs nanocylinders embedded into a liquid crystal matrix. We numerically demonstrate that, by switching the liquid crystal orientation with a realistic voltage bias, it is possible to modulate the total power and the emission pattern of the SH signal coming from the proposed metasurface. Our results open important opportunities for tunable metadevices such as nonlinear holograms and dynamic displays.
Highlights
High refractive index dielectric and semiconductors nanostructures emerged as excellent candidates for nanophotonic applications
AlGaAs exhibits a direct gap which increases with the Aluminum molar fraction, enabling Two Photons Absorption (TPA) free operation at 1550 nm
Efficient SH generation (SHG) from nanostructured AlGaAs was recently demonstrated in different scenarios, either in isolated nanoantennas or in metasurfaces [14,15,16]
Summary
High refractive index dielectric and semiconductors nanostructures emerged as excellent candidates for nanophotonic applications. The possibility to tune their radiation profiles or the ability to control the polarization of the scattered light with very low losses with respect to metallic nanodevices, in the near-infrared and visible region of the electromagnetic spectrum, have drawn considerable attention to the photonic research field [1,2,3,4,5]. In this regard, semiconductors are attractive materials due to their high permittivity and the ability to tune their optical properties by varying the geometrical aspect ratio or the carrier density through appropriate doping. The obtained results pave the way for the realization of dynamically tunable nonlinear metasurfaces with numerous applications including nonlinear holography, imaging and active beam shaping
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