Thursday, November 29th
Pursuing a Cavity QED System that Couples a Nitrogen Vacancy Center to a Whispering Gallery Mode Silica
Department of Physics, University of Oregon
Our research is focused on developing a cavity quantum electrodynamic system that can couple a nitrogen vacancy center in a diamond nanostructure to the whispering gallery modes of a fused silica microsphere. We have developed a composite system has been developed which allows for a diamond nanopillar to be positioned near and scanned across the surface of a deformed double-stemmed microsphere system with nanometer precision. At cryogenic temperatures and in high purity bulk diamond substrates, nitrogen vacancy centers can exhibit atomic like linewidths. Silica microspheres are the only class of microresonators with quality factors high enough to operate in the strong coupling regime. Issues concerning the feasibility of such an arrangement at 10 K has have been explored and include: (i) surveying existing commercial samples for optically sharp and stable color centers near the diamond surface, (ii) limitations due to the fact that the dipole interacts with an evanescent field that decays quickly from the surface of the resonator, (iii) overlap mismatch for the resonance frequencies of the emitter and cavity as well as (iv) controlling the relative position between the nanopillar and the cavity mode volume.
Refreshments at 10:50 AM. Seminar begins at 11:00 AM.
Building 8, Room 241
For further information, please call (909) 869-4014