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arXiv · 1511.01769

Ultralow-Noise SiN Trampoline Resonators for Sensing and Optomechanics

Christoph Reinhardt·Tina Müller·Alexandre Bourassa·Jack C. Sankey
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Abstract

In force sensing, optomechanics, and quantum motion experiments, it is typically advantageous to create lightweight, compliant mechanical elements with the lowest possible force noise. Here we report wafer-scale batch fabrication and characterization of high-aspect-ratio, nanogram-scale Si$_3$N$_4$ "trampolines" having quality factors above $4 \times 10^7$ and ringdown times exceeding five minutes (1 mHz linewidth). We measure a thermally limited force noise sensitivity of 16.2$\pm$0.8 aN/Hz$^{1/2}$ at room temperature, with a spring constant ($\sim$1 N/m) 2-5 orders of magnitude larger than those of competing technologies. We also characterize the suitability of these devices for high-finesse cavity readout and optomechanics applications, finding no evidence of surface or bulk optical losses from the processed nitride in a cavity achieving finesse 40,000. These parameters provide access to a single-photon cooperativity $C_0 \sim 8$ in the resolved-sideband limit, wherein a variety of outstanding optomechanics goals become feasible.

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Christoph Reinhardt, Tina Müller, Alexandre Bourassa, Jack C. Sankey. 2015-11-05. Ultralow-Noise SiN Trampoline Resonators for Sensing and Optomechanics. https://doi.org/10.1103/physrevx.6.021001

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