Optomechanical gigahertz oscillator made of a two photon absorption free piezoelectric III/V semiconductor

Inès Ghorbel, François Swiadek, Rui Zhu, Daniel Dolfi, Gaëlle Lehoucq, Aude Martin, Grégory Moille, Loïc Morvan, Rémy Braive, Sylvain Combrié, Alfredo De Rossi

APL Photonics 4, 116103 (2019) – Published 15 November 2019

Here, we report on the demonstration, in ambient atmospheric conditions, of an optomechanical crystal based on the concept of bichromatic lattice. Self-sustained oscillations directly at 3 GHz are routinely achieved with a low optical power threshold of 40 μW and a short-term linewidth narrowed down to 100 Hz in agreement with phase noise measurements (−110 dBc/Hz at 1 MHz from the carrier) for free running optomechanical oscillators.