Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects

Q 30.32: Poster

Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais

Asymmetric backscattering of light in bottle microresonators — •Stefan Walser, Christian Junge, Jürgen Volz, and Arno Rauschenbeutel — Vienna Center for Quantum Science and Technology, TU Wien - Atominstitut, Stadionallee 2, A-1020 Wien, Austria

Bottle microresonators are a novel type of whispering-gallery-mode (WGM) resonators [1], based on microfiber technology. Their properties, such as the near lossless coupling to tapered fiber couplers and full tunability, make them a powerful tool for a range of applications including, e.g., cavity quantum electrodynamics [2]. The evanescent field surrounding these resonators can interact with defects of the resonator surface or scatterers attached to it. This interaction leads to backscattering of the light from one running wave mode into the other which leads to a splitting of the cavity resonance. Remarkably, the backscattering rate can depend on the sense of rotation of the mode. In our experiments, we observe clearly different backscattering rates for the two propagation directions. Theoretical models suggest that the origin of this asymmetry arises from the interference of the scattered light from at least two perturbations on the surface. Using properly positioned additional scatterers such as gold nanoparticles or AFM tips, we want to experimentally study this effect, in order to precisely design the backscattering properties for future applications.

[1] M. Pöllinger et al., Phys. Ref. Let. 103, 053901 (2009)
[2] C. Junge et al., Phys. Ref. Let. 110, 213604 (2013)