Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Optomechanics II
Q 56.3: Vortrag
Freitag, 10. März 2017, 15:00–15:15, P 4
Two dimensional optomechanical crystals for quantum optomechanics — •Hannes Pfeifer1, Greg MacCabe2,3, Hengjiang Ren2,3, and Oskar Painter2,3 — 1MPI for the Science of Light, Erlangen, Germany — 2Kavli Nanoscience Institute, California Institute of Technology, Pasadena, USA — 3Institute for Quantum Information and Matter and Thomas J. Watson, Sr., Laboratory of Applied Physics, California Institute of Technology, Pasadena, USA
Cooling of nanomechanical resonators to their motional ground state triggered recent achievements like non-classical mechanical state preparation or coherent optical to microwave photon conversion. Implementations through optomechanical crystal (OMC) resonators use co-localization of optical and acoustic modes in a patterned device layer of a silicon-on-insulator (SOI) chip. Their operation at small thermal mechanical mode occupations and mechanical Q-factors 106 requires pre-cooling to millikelvin temperatures, where even weak optical absorption induces unfavorable local heating. Commonly used one-dimensional nanobeam OMC resonators have significantly smaller thermal connectivity to the cool environment and reduced robustness against undesired heating than their two-dimensional counterparts. A drawback of 2D OMCs were their complex fabrication and weaker interaction of acoustic and optical modes. Here, we present a modified 2D OMC cavity that exhibits coupling strengths comparable to the previous nanobeams and reduces the complexity for nanofabrication compared to other 2D OMCs. It uses a mechanical mode at 11 GHz and creates a high Q optical cavity at telecom wavelengths.