Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 49: Quantum Effects: Cavity QED I
Q 49.4: Talk
Thursday, March 26, 2015, 12:00–12:15, B/gHS
High numerical aperture, ultralow mode volume and scannable Fabry Pérot cavity. — •Hrishikesh Kelkar1, Daqing Wang1,2, Björn Hoffman1, Silke Christiansen1,3, Stephan Götzinger2,1, and Vahid Sandoghdar1,2 — 1Max Planck Institute for the Science of Light, 91058 Erlangen, Germany — 2Friedrich Alexander University Erlangen-Nürnberg, 91058 Erlangen, Germany — 3Helmholtz Center Berlin for Materials and Energy, 14109 Berlin, Germany
The interaction between a single emitter and vacuum radiation field can be enhanced by placing the emitter in an optical cavity. This enhancement scales proportionally with the cavity quality factor Q and inversely with the square root of the cavity mode volume. Previous Cavity QED studies have usually worked with high Qs and large or moderate mode volumes. We present the first tunable microcavity with a mode volume less than 0.5 µ m3 and a low Q of about 150. The cavity consists of a metal-coated curved micromirror fabricated by focused ion beam milling and a flat distributed Bragg reflector. In addition to the basic characterization of this cavity, we report on a strong modification of the cavity resonance by a nanoparticle and a counter-intuitive increase in Q. We also discuss our progress in operating the cavity at cryogenic temperatures, where we expect to modify the radiative decay channels of single emitters such as molecules and NV centers using a moderate Purcell factor of about 25.