Fiber-microsphere system at cryogenic temperatures toward cavity QED using diamond NV centers.
The coupling of a microsphere resonator to a tapered fiber was demonstrated at cryogenic temperatures (8 - 13 K) and investigated with a probe laser light whose frequency around the zero phonon line of nitrogen vacancy centers in diamond (638 nm). For this purpose, a liquid-helium-flow cryostat with a large sample chamber is developed and a resonance dip with a Q of 2 x 10(6) is observed. The resonance frequency and the coupling condition are found to be stable for a period of one hour.
Takashima
Hideaki
H
Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0020, Japan.
Asai
Takeshi
T
Toubaru
Kiyota
K
Fujiwara
Masazumi
M
Sasaki
Keiji
K
Takeuchi
Shigeki
S