A phononic bandgap shield for high-Q membrane microresonators
classification
❄️ cond-mat.mes-hall
keywords
phononicbandgapmembranemembranesmodesshieldsupportacoustic
read the original abstract
A phononic crystal can control the acoustic coupling between a resonator and its support structure. We micromachine a phononic bandgap shield for high Q silicon nitride membranes and study the driven displacement spectra of the membranes and their support structures. We find that inside observed bandgaps the density and amplitude of non-membrane modes are greatly suppressed, and membrane modes are shielded from an external mechanical drive by up to 30 dB.
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