SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 40: Photonics II
Q 40.4: Talk
Wednesday, March 8, 2023, 15:15–15:30, F442
Low thermal noise meta-mirrors with 99.95 % reflectivity — •Johannes Dickmann1, Steffen Sauer1,2, Liam Shelling Neto1, and Stefanie Kroker1,2 — 1Technische Universität Braunschweig, Institut für Halbleitertechnik, Langer Kamp 6a/b, 38106 Braunschweig, Germany — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
Many experiments in fundamental science are limited by the thermal noise of optical components, e.g. interferometric gravitational wave detectors, optical atomic clocks or cavity experiments on dark matter and general relativity. It has been found that, in addition to quantum noise, which can be reduced by using squeezed states of light, it is primarily Brownian noise of the mirror coatings that limit the sensitivity of the measurements. One way to reduce this noise is to use mirror layers with small mechanical losses, but these are difficult to find, especially at cryogenic temperatures. We present extensive investigations on microstructured mirror surfaces, i.e. meta-mirrors, for applications in high precision metrology. In particular, noise calculations and record-breaking experimental results of the reflectivities of these mirrors are presented.