Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology
Q 16.55: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
High-Q membrane mechanical oscillators made from InxGa1−xP for cavity optomechanics experiments — Garrett D. Cole1, •Witlef Wieczorek1, Claus Gärtner1, Ramon M. Nia1,2, Karoline Siquans1, Jason Hoelscher-Obermaier1,2, and Markus Aspelmeyer1 — 1Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna, 1090 Vienna, Austria — 2Max Planck Institute for Gravitational Physics, Callinstraße 38, 30167 Hannover, Germany
Quantum experiments performed with cavity optomechanical systems hinge on the availability of mechanical oscillators with both a low decoherence rate and large optomechanical coupling. Here we present membrane mechanical oscillators constructed from a novel material system that promises a route towards these goals. Our high-Q membranes are fabricated from a 30 nm thick, tensile strained InxGa1−xP film and can be regarded as a convergence of two successful technologies: (i) high-Q membranes made from SiN and (ii) single-crystaline semiconductor GaAs membranes. In first measurements, we determine Q factors up to 106 at room temperature and a Q· f product of 1011. At low temperatures we measure improvements by a factor of 10. In the future, we will impart larger tensile strain in the InxGa1−xP layer to further increase the mechanical frequency. The InxGa1−xP material system is promising for a wide range of experiments, such as fully monolithic cavity-optomechanical systems, stacked membranes and optoelectronically-active mechanical resonators.