Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 54: Laser Applications: Miscellaneous
Q 54.1: Vortrag
Donnerstag, 26. März 2015, 12:15–12:30, K/HS2
Efficient up- and downconversion of w-band microwave signals into the optical regime using a whispering gallery mode resonator — •Florian Sedlmeir1,2,3, Alfredo Rueda1,2,3, Martin Schneidereit1,2, Sascha Preu4, Mario Mendez-Aller5, Antti V. Räisänen6, L. Enrique Garcia-Munoz5, Gerd Leuchs1,2, and Harald G.L. Schwefel1,2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Institute for Optics, Information and Photonics, Univ. of Erlangen, Germany — 3SAOT, Univ. of Erlangen, Germany — 4TU Darmstadt, Germany — 5Univ. Carlos III of Madrid, Spain — 6Aalto Univ., Finland
Efficient and coherent conversion of microwave signals into the optical domain is of great interest for quantum communications as it would provide a link between low temperature circuit QED and room temperature quantum optics. Here, we present an all-resonant scheme based on electro optical conversion which can be carried out at room temperature without losing efficiency: We employ a high-Q lithium niobate whispering gallery mode resonator which supports optical as well as w-band microwave resonances. Phasematching in such a structure is difficult to achieve, as the refractive indices of optical and microwave frequencies differ strongly. However, the microwave modes experience strong geometric dispersion and therefore allowed us to reach the phasematched regime by careful tailoring the resonators geometry. We efficiently coupled both wavelength regimes to the resonator and surpass the so far best reported electrooptic based microwave to optical conversion by two orders of magnitude.