Optomechanical platform with a three-dimensional waveguide cavity

Gunupudi, B and Das, SR and Navarathna, R and Sahu, SK and Majumder, S and Singh, V (2019) Optomechanical platform with a three-dimensional waveguide cavity. In: Physical Review Applied, 11 (2).

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Abstract

At low temperatures, microwave cavities are often preferred for the readout and control of a variety of systems. In this paper, we present design and measurements on an optomechanical device based on a three-dimensional rectangular waveguide cavity. We show that by suitably modifying the electromagnetic field corresponding to the fundamental mode of the cavity, the equivalent circuit capacitance can be reduced to 29 fF. By coupling a mechanical resonator to the modified electromagnetic mode of the cavity, we achieve a capacitance participation ratio of 43. We demonstrate an optomechanical cooperativity, C� 40, characterized by performing measurements in the optomechanically induced absorption limit. In addition, due to a low-impedance environment between the two halves of the cavity, our design has the flexibility of incorporating a dc bias across the mechanical resonator, often a desired feature in tunable optomechanical devices. © 2019 American Physical Society.

Item Type:	Journal Article
Publication:	Physical Review Applied
Publisher:	American Physical Society
Additional Information:	copyright for this article belongs to American Physical Society
Keywords:	Capacitance; Electromagnetic fields; Equivalent circuits; Resonators; Waveguides, Circuit capacitance; Electromagnetic modes; Fundamental modes; Induced absorption; Mechanical resonators; Microwave cavity; Participation ratios; Three-dimensional waveguides, Optomechanics
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	08 Apr 2019 11:27
Last Modified:	08 Apr 2019 11:27
URI:	http://eprints.iisc.ac.in/id/eprint/62009

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