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Q: Fachverband Quantenoptik und Photonik
Q 39: Posters: Quantum Optics and Photonics III
Q 39.30: Poster
Mittwoch, 11. März 2020, 16:30–18:30, Empore Lichthof
Bistability in an optomechanically deformable metasurface — •Carol Bibiana Rojas Hurtado1, Florian Bruns2, Johannes Dickmann1, and Stefanie Kroker1,2 — 1Physikalisch-Technische Bundesanstalt — 2Technische Universität Braunschweig
We investigate bistability in silicon nanostructured surface used as an optomechanical system in the telecom wavelength range. The surface consists of two layers of subwavelength gratings with high aspect ratio making it compliant to optical forces. Large optical forces result from employing optical modes with high-quality factors, namely quasi-bound states in the continuum. The two interacting forces are computed with Finite Element Analysis: the induced optical forces from an incoming beam that deform the ridges and the opposing elastic restoring force that brings the system to a new equilibrium position. A graphical method is used to find the solutions at a given input intensity, i.e. one solution for one stable state or three solutions for a bistable condition (one unstable and two stable states). With this method, we can also retrieve the hysteresis curve characteristic of bistability. The stable states correspond to two different values of the optical response of the surface, e.g. a high and low reflectivity of the surface. We investigate the possibility to switch up and down between these two stable states, which is promising for an optomechanically controlled switch operating at low input powers in contrast to the much higher intensities needed in common all-optical switches involving nonlinear materials.