Monocrystalline AlGaAs heterostructures for high-reflectivity high-Q micromechanical resonators in the MHz regime
- Author(s)
- Garrett Cole, Simon Gröblacher, Katharina Gugler, Sylvain Gigan, Markus Aspelmeyer
- Abstract
We present high-performance megahertz micromechanical oscillators based on freestanding epitaxial AlxGa1−xAs distributed Bragg reflectors. Compared with dielectric reflectors, the low mechanical loss of the monocrystalline heterostructure gives rise to significant improvements in the achievable mechanical quality factor Q while simultaneously exhibiting near unity reflectivity. Experimental characterization yields an optical reflectivity exceeding 99.98% and mechanical quality factors up to 20 000 at 4K. This materials system is not only an interesting candidate for optical coatings with ultralow thermal noise, but also provides a promising path toward quantum optical control of massive micromechanical mirrors.
- Organisation(s)
- Quantum Science
- External organisation(s)
- Österreichische Akademie der Wissenschaften (ÖAW)
- Journal
- Applied Physics Letters
- Volume
- 10
- No. of pages
- 3
- ISSN
- 0003-6951
- DOI
- https://doi.org/10.1063/1.2952512
- Publication date
- 2008
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 1030 Physics, Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/94d76c10-1c9f-483a-9f32-a8080e99cbad