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.
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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