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arXiv · 1210.8023

Optomechanical and Photothermal Interactions in Suspended Photonic Crystal Membranes

David N. Woolf·Pui-Chuen Hui·Eiji Iwase·Mughees Khan·Alejandro W. Rodriguez·Parag Deotare·Irfan Bulu·Steven G. Johnson·Federico Capasso·Marko Loncar
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Abstract

We present here an optomechanical system fabricated with novel stress management techniques that allow us to suspend an ultrathin defect-free silicon photonic-crystal membrane above a Silicon-on-Insulator (SOI) substrate with a gap that is tunable to below 200 nm. Our devices are able to generate strong attractive and repulsive optical forces over a large surface area with simple in- and outcoupling and feature the strongest repulsive optomechanical coupling in any geometry to date (gOM/2{\pi} ~ -65 GHz/nm). The interplay between the optomechanical and photo-thermal-mechanical dynamics is explored, and the latter is used to achieve cooling and amplification of the mechanical mode, demonstrating that our platform is well-suited for applications in low-power mass, force, and refractive index sensing as well as and optomechanical accelerometry.

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David N. Woolf, Pui-Chuen Hui, Eiji Iwase, Mughees Khan, Alejandro W. Rodriguez, Parag Deotare, Irfan Bulu, Steven G. Johnson, Federico Capasso, Marko Loncar. 2012-10-30. Optomechanical and Photothermal Interactions in Suspended Photonic Crystal Membranes. https://doi.org/10.1364/oe.21.007258

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