Cavity Optomechanics with Polymer-Based Multi-Membrane Structures

Despite their application in multiple fields, ranging from quantum sensing to fundamental tests of quantum mechanics, conventional state-of-the-art cavity optomechanical experiments have been limited in their scaling to- wards systems with multiple mechanical resonators. 3D direct laser writing offers a new approach of fabricating multi-membrane structures that can be directly integrated into fiber Fabry-Perot cavities. Here, we experimentally demonstrate direct laser-written stacks of two or more coupled membranes - with normal-mode splittings of up to a MHz - interfaced by fiber cavities. As a first step, we show that simple, uncoupled multi-membrane structures can be properly fabricated with the direct laser writing approach and used for optomechanical experiments, as shown in Fig. 1(a).