Air mode silicon nitride photonic crystals and their application to nonlinear quantum optomechanical sensing

2019/05/08 by Healey, Chris, Kaviani, Hamidreza, Barclay, Paul E.
#FOS: Physical sciences #Optics (physics.optics) #Quantum Physics (quant-ph)

paper · doi:10.48550/arxiv.1905.03341

Abstract

Nanoscale photonic crystal cavity optomechanical devices enable detection of nanomechanical phenomena with a sensitivity sufficient to observe quantum effects. Here we present the design of a one-dimensional air-mode photonic crystal cavity patterned in a silicon nitride nanobeam, and show that it forms the basis for cavity optomechanical split-beam and paddle nanocavity devices useful for force detection and nonlinear quantum sensing. The air-mode of this device is advantageous for optomechanical coupling, while also having ultrahigh optical quality factor Q_o∼ 10⁶ despite its proximity to the light-line and the relatively low refractive index of silicon nitride. Paddle nanocavities realized from this device have a quadratic coupling coefficient g⁽²⁾/2π~=~10~MHz/nm², and their performance within the context of quantum optomechanics experiments is analyzed.

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