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Q: Fachverband Quantenoptik und Photonik

Q 27: Precision Measurements and Metrology IV (joint session Q/A)

Q 27.2: Talk

Wednesday, March 16, 2022, 11:00–11:15, Q-H11

Metamirrors as platform for next-generation ultra-stable laser cavities — •Steffen Sauer^{1, 2}, Johannes Dickmann^{1, 2}, Liam Shelling Neto^{1, 2}, and Stefanie Kroker^{1, 2, 3} — ¹TU Braunschweig, Institute for Semiconductor Technology, Hans-Sommer-Str. 66, 38106 Braunschweig, Germany — ²LENA Laboratory for Emergng Nanometrology, Langer Kamp 6a/b, 38106 Braunschweig — ³Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

The key ingredients of today′s most precise quantum optics experiments are laser cavities, e.g. in interferometric gravitational wave detectors and atomic clocks. These cavities are based on two highly reflective mirrors with required reflectivities of > 99.997 %. Additionally, cavities will play a key role in future dark matter research. The currently most stable laser cavities are limited by the mirror coating noise. A highly promising approach for the reduction of thermal noise is the implementation of metamirrors. Metamirrors are formed by laterally structured optical sub-wavelength nanostructures, which are designed to manipulate the near-field of the impinging light. Thus, the reflectivity can theoretically reach 100 % with only one structured layer. In this contribution, we present the current progress in the field of metamirrors for ultra-stable laser cavities, including thermal noise computation and reflectivity measurements.