Cryogenic spectroscopy of ultra-low density colloidal lead chalcogenide quantum dots on chip-scale optical cavities towards single quantum dot near-infrared cavity QED.
We present evidence of cavity quantum electrodynamics from a sparse density of strongly quantum-confined Pb-chalcogenide nanocrystals (between 1 and 10) approaching single-dot levels on moderately high-Q mesoscopic silicon optical cavities. Operating at important near-infrared (1500-nm) wavelengths, large enhancements are observed from devices and strong modifications of the QD emission are achieved. Saturation spectroscopy of coupled QDs is observed at 77K, highlighting the modified nanocrystal dynamics for quantum information processing.
Bose
Ranojoy
R
Optical Nanostructures Laboratory, Center for Integrated Science and Engineering, Solid-state Science and Engineering, and Mechanical Engineering, Columbia University, New York, NY 10027, USA. rb2261@columbia.edu
Gao
Jie
J
McMillan
James F
JF
Williams
Alex D
AD
Wong
Chee Wei
CW
D018011:Chalcogens / Q000737:chemistry*; D003080:Cold Temperature; D003102:Colloids / Q000737:chemistry; D003198:Computer Simulation; D056656:Lab-On-A-Chip Devices; D007854:Lead / Q000737:chemistry*; D008956:Models, Chemical; D045663:Quantum Dots; D013057:Spectrum Analysis / Q000379:methods*
D018011:Chalcogens; D003102:Colloids; D007854:Lead