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arXiv · 1309.4971

Ultrahigh Q-Frequency product for optomechanical disk resonators with a mechanical shield

Dac Trung Nguyen·Christophe Baker·William Hease·Selsabil Sejil·Pascale Senellart·Aristide Lemaitre·Sara Ducci·Giuseppe Leo·Ivan Favero
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Abstract

We report on optomechanical GaAs disk resonators with ultrahigh quality factor - frequency product Qf. Disks standing on a simple pedestal exhibit GHz breathing modes attaining a Qf of 10^13 measured under vacuum at cryogenic temperature. Clamping losses are found to be the dominant source of dissipation in this configuration. A new type of disk resonator integrating a shield within the pedestal is then proposed and its working principles and performances investigated by numerical simulations. For dimensions compatible with fabrication constraints, the clamping-loss-limited Q reaches 10^7-10^9 corresponding to Qf of 10^16-10^18. This shielded pedestal approach applies to any heterostructure presenting an acoustic mismatch.

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Dac Trung Nguyen, Christophe Baker, William Hease, Selsabil Sejil, Pascale Senellart, Aristide Lemaitre, Sara Ducci, Giuseppe Leo, Ivan Favero. 2013-09-19. Ultrahigh Q-Frequency product for optomechanical disk resonators with a mechanical shield. https://doi.org/10.1063/1.4846515

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