High power millimeter wave sources, such as Megawatt, 170 GHz gyrotrons, require window-materials with very low dielectric loss for their normal operation. 

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The primary goal of this project is to acquire the necessary experimental data and perform calculations to develop theoretical models to elucidate the predominate mechanisms of absorption for mm and sub-mm electromagnetic waves in ultra-low-loss semiconductors, especially CVD diamond and SiC, which are among the most promising low-loss materials available. 

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Dutta, NCCU Physics Department

Jones, NCCU Physics Department

Yuanci Gao, NCCU Physics Department