A simple integrated single-atom detector
Marco Wilzbach, Dennis Heine, S\"onke Groth, Xiyuan Liu, Thomas Raub,, Bj\"orn Hessmo, J\"org Schmiedmayer
TL;DR
This paper introduces a reliable integrated fluorescence detector for single atoms using a fiber-based system on an atom chip, achieving high detection efficiency and signal-to-noise ratio.
Contribution
It presents a novel, integrated single-atom detector combining fiber optics and lithographic structures for robust, high-efficiency detection on an atom chip.
Findings
Detection efficiency up to 66%
Signal-to-noise ratio over 100
Effective detection of freely propagating Rb87 atoms
Abstract
We present a reliable and robust integrated fluorescence detector capable of detecting single atoms. The detector consists of a tapered lensed single-mode fiber for precise delivery of excitation light and a multimode fiber to collect the fluorescence. Both are mounted in lithographically defined SU-8 holding structures on an atom chip. Rb87 atoms propagating freely in a magnetic guide are detected with an efficiency of up to 66%, and a signal-to-noise ratio in excess of 100 is obtained for short integration times.
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