Diamond-integrated optomechanical circuits

Patrik Rath, Svetlana Khasminskaya, Christoph Nebel, Christoph Wild and Wolfram H.P. Pernice ()
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Patrik Rath: Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1
Svetlana Khasminskaya: Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1
Christoph Nebel: Fraunhofer Institute for Applied Solid State Physics
Christoph Wild: Fraunhofer Institute for Applied Solid State Physics
Wolfram H.P. Pernice: Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1

Nature Communications, 2013, vol. 4, issue 1, 1-9

Abstract: Abstract Diamond offers unique material advantages for the realization of micro- and nanomechanical resonators because of its high Young’s modulus, compatibility with harsh environments and superior thermal properties. At the same time, the wide electronic bandgap of 5.45 eV makes diamond a suitable material for integrated optics because of broadband transparency and the absence of free-carrier absorption commonly encountered in silicon photonics. Here we take advantage of both to engineer full-scale optomechanical circuits in diamond thin films. We show that polycrystalline diamond films fabricated by chemical vapour deposition provide a convenient wafer-scale substrate for the realization of high-quality nanophotonic devices. Using free-standing nanomechanical resonators embedded in on-chip Mach–Zehnder interferometers, we demonstrate efficient optomechanical transduction via gradient optical forces. Fabricated diamond resonators reproducibly show high mechanical quality factors up to 11,200. Our low cost, wideband, carrier-free photonic circuits hold promise for all-optical sensing and optomechanical signal processing at ultra-high frequencies.

Date: 2013
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DOI: 10.1038/ncomms2710

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