Regensburg 2022 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 5: Implementations: Solid state systems
QI 5.7: Vortrag
Dienstag, 6. September 2022, 11:30–11:45, H8
Demonstration of an integrated optomechanical microcavity with a suspended frequency-dependent photonic crystal reflector — •Sushanth Kini M1, Anastasiia Ciers1, Juliette Monsel1, Cindy Peralle2, Shu Min Wang1, Philippe Tassin2, and Witlef Wieczorek1 — 1Dept of Microtechnology and Nanoscience, Chalmers University, Göteborg, Sweden — 2Dept of Physics, Chalmers University, Göteborg, Sweden
Optical microcavities confine the light field on sub-wavelength length scales leading to stronger light-matter interactions. Using microcavities in cavity optomechanics, which explores the interaction between an optical cavity and mechanical motion, one drastically increases the optomechanical interaction. In our work, we use this concept in on-chip optomechanical microcavities fabricated from AlGaAs heterostructures. In our realization, the mechanically-compliant element is a suspended photonic crystal (PhC) reflector slab, whose distance to a distributed Bragg reflector (DBR) mirror is less than the optical wavelength. We demonstrate a precise control over the microcavity resonance wavelength by varying the PhC hole radius, notably keeping cavity length constant. Importantly, we demonstrate that the frequency dependence of the optical reflectivity of the PhC slab modifies the optomechanical effects compared to a conventional optomechanical system. In the future, this integrated optomechanical microcavity platform offers novel capabilities in manipulating mechanical motion, such as offering more efficient cooling schemes or the capability to generate mechanical squeezing in the ultra-strong coupling regime.