Kavli Affiliate: Simon Groblacher
| First 5 Authors: Robert Stockill, Moritz Forsch, Frederick Hijazi, Grégoire Beaudoin, Konstantinos Pantzas
| Summary:
Mechanical resonators can act as excellent intermediaries to interface single
photons in the microwave and optical domains due to their high quality factors.
Nevertheless, the optical pump required to overcome the large energy difference
between the frequencies can add significant noise to the transduced signal.
Here we exploit the remarkable properties of thin-film gallium phosphide to
demonstrate on-chip microwave-to-optical conversion, realised by piezoelectric
actuation of a Gigahertz-frequency optomechanical resonator. The large
optomechanical coupling and the suppression of two-photon absorption in the
material allows us to operate the device at optomechanical cooperativities
greatly exceeding one, and, when using a pulsed upconversion pump, induce less
than one thermal noise phonon. We include a high-impedance on-chip matching
resonator to mediate the mechanical load with the 50-Ohm source. Our results
establish gallium phosphide as a versatile platform for ultra-low-noise
conversion of photons between microwave and optical frequencies.
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