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DS: Fachverband Dünne Schichten
DS 12: Poster
DS 12.37: Poster
Mittwoch, 29. März 2023, 17:00–19:00, P3
Influence of dielectric Layers on the optomechanical Properties of Polymer Membranes in a Fiber Cavity — •Andreas Reuss1, Stefan Linden1, Hannes Pfeifer2, Lukas Tenbrake2, and Alexander Fassbender1 — 1Physikalisches Institut, Universität Bonn, Germany — 2Institut für Angewandte physik, Universität Bonn, Germany
Fiber cavities are an attractive platform for optomechanical experiments as they can combine direct fiber-coupled optical access, small cavity lengths, high optical finesse, and an open resonator volume. Direct laser writing allows for a fast and flexible way to add polymer drums as mechanical resonators directly on the end facets of a fiber cavity. These membrane-in-the-middle systems show a rather large optomechanical coupling strength despite of the low reflectivity due to the maximized intensity differences on the two membrane interfaces. A disadvantage of direct laser written structures are the comparatively large mechanical losses of the used resist, which limit the mechanical quality factor of the membranes to several hundred at cryogenic temperatures. Therefore, we are interested how the deposition of different dielectric layers influences the optomechanical response of the polymer membranes. By using materials with high young’s modulus, like MgF2, we aim to reduce overall mechanical losses and therefore increase the optomechanical response.