Laser-driven light sails need to withstand very high intensities of incident light, and therefore must comprise low-loss materials that remain low loss with increasing temperatures. We will describe our measurements of temperature-dependent optical properties of materials (oxides, nitrides, semiconductors) for the development of metasurfaces for laser-driven light sails. We use oscillator-based models to fit ellipsometry data at different temperatures in the wavelength region where a precise measurement can be made, and revise these models with datapoints in the low-absorption region measured using photo-thermal common-path interferometry. We also demonstrate how metasurface performance is affected by the temperature-dependent properties of constituent materials.
Bound states in the continuum (BICs) in dielectric metasurfaces have gained significant interest for their narrow linewidths and potential applications to high-powered lasers, filters, and sensors. The resonant frequency of a BIC may be tuned by altering its dielectric environment either by changing the substrate or introducing a tunable material such as graphene. In this work, we use a gradient-descent based optimization approach to design 1D BIC metasurfaces with optical modes that exhibit extreme resonant frequency dependence on their dielectric environment. We then experimentally test our predictions by fabricating the structures, measuring their optical response, and comparing to our predictions.
Knowledge of temperature-dependent optical properties of materials is required for photonics applications in extreme conditions, i.e., at high temperatures. In this talk, we will describe our latest measurements of temperature-dependent optical properties of materials (oxides, nitrides, semiconductors) for the development of metasurfaces for high-temperature applications that include thermal radiators and light sails. We use oscillator-based models to fit ellipsometry data at different temperatures in the wavelength region where a precise measurement can be made, and extrapolate to get broadband temperature-dependent optical properties. We also demonstrate using simulations how metasurface performance is affected by the temperature-dependence of constituent materials.
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