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Undercut design in a highly-stressed microdisk resonator cavity affects the magnitude and distribution of biaxial strain in the resonator, providing an additional approach to band-structure engineering. While a wider undercut allows greater strain transfer, the peak strain shifts away from microdisk edges where whispering gallery modes reside. With both considerations, we find that the optimal undercut...
Applying tensile strain with silicon nitride is demonstrated to improve the responsivity of germanium-tin (Ge1−xSnx) PIN photodetectors at longer wavelengths. Such external stressor films show promise for extending the application of Ge1−xSnx optoelectronic devices into the mid-infrared range.
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