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Diamond-integrated optomechanical circuits

 
: Rath, P.; Khasminskaya, S.; Nebel, C.; Wild, C.; Pernice, W.H.P.

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Nature Communications 4 (2013), Art. 1690, 9 S.
ISSN: 2041-1723
Englisch
Zeitschriftenaufsatz
Fraunhofer IAF ()

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.

: http://publica.fraunhofer.de/dokumente/N-241428.html