Physics – Optics
Scientific paper
2011-09-27
Physics
Optics
Scientific paper
We applied a recently developed fiber coupling technique to superconducting single photon detectors (SSPDs). As the detector area of SSPDs has to be kept as small as possible, coupling to an optical fiber has been either inefficient or unreliable. Etching through the silicon substrate allows fabrication of a circularly shaped chip which self aligns to the core of a ferrule terminated fiber in a fiber sleeve. In situ alignment at cryogenic temperatures is unnecessary and no thermal stress during cooldown, causing misalignment, is induced. We measured the quantum efficiency of these devices with an attenuated tunable broadband source. The combination of a lithographically defined chip and high precision standard telecommunication components yields near unity coupling efficiency and a system detection efficiency of 34% at a wavelength of 1200 nm. This quantum efficiency measurement is confirmed by an absolute efficiency measurement using correlated photon pairs (with $\lambda$ = 1064 nm) produced by spontaneous parametric down-conversion. The efficiency obtained via this method agrees well with the efficiency measured with the attenuated tunable broadband source.
Dorenbos Sanders N.
Driessen E. F. C.
Heeres Reinier W.
Zwiller Valery
No associations
LandOfFree
Efficient and robust fiber coupling of superconducting single photon detectors does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Efficient and robust fiber coupling of superconducting single photon detectors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Efficient and robust fiber coupling of superconducting single photon detectors will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-62273