We present an athermal resonant metasurface created by periodically coupled subwavelength structures in an engineered membrane. In this approach, we propose a bilayer metasurface structure with opposite thermo-optic coefficients to compensate for the undesired spectral shift caused by thermal effects. By creating a bilayer metastructure with different thermo-optic coefficients, thermally-induced spectral shifts could be minimized, thus allowing for a nearly temperatureinsensitive resonant metasurface. The working principle of the proposed metasurface is based on the epitaxial engineering of the coupled subwavelength structures in the metasurface to cancel the temperature-dependent resonant wavelength shift. To demonstrate the proposed thermal compensation concept, Fano-type guided mode resonance will be used as an optical probe in a TiO2/Si composite film. The proposed athermal resonant metasurface offers great potential for many applications, such as free-space optical communications, metasurface-based optical sensing, imaging, filters, and modulators.
In this talk, we present our recent findings on compound semiconductor-based nonlinear metasurfaces for all-optical signal processing. Nonlinear metasurfaces have revolutionized the field of nonlinear optics by enabling a radically different way to control light-matter interactions at the subwavelength scale. In this approach, nonlinear optical processes can be maximized by carefully choosing the shape, orientation, and arrangement of subwavelength-scale artificial atoms, called meta-atoms. By introducing Kerr nonlinearity from compound semiconductor materials, such as AlGaAs/GaAs, into a high-quality resonant metasurface, power requirement to achieve optical bistability can be greatly reduced. Optical bistability can has been actively studied due to its potential applications for all-optical switching and optical logic gates. In our research, we will utilize intensity-dependent refractive index in a semiconductor metasurface to realize refractive bistability for all-optical signal processing. Different design strategies will be discussed to excite quasi-bound waves with a high-quality factor and a small mode volume.
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