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arXiv · 1905.03341

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

Chris Healey·Hamidreza Kaviani·Paul E. Barclay
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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 $Q_o\sim 10^6$ 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 $g^{(2)}/2\pi$~=~10~MHz/nm$^{2}$, and their performance within the context of quantum optomechanics experiments is analyzed.

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Chris Healey, Hamidreza Kaviani, Paul E. Barclay. 2019-05-08. Air mode silicon nitride photonic crystals and their application to nonlinear quantum optomechanical sensing. https://arxiv.org/abs/1905.03341

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