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SUMMARY:(SP Wednesday Workshop) - Probe for Cryostat with RF Input and Opt
 ical Scanning Function - Mr Tzu-Kan Hsiao\, University of Cambridge
DTSTART:20140625T131500Z
DTEND:20140625T141500Z
UID:TALK52472@talks.cam.ac.uk
CONTACT:Teri Bartlett
DESCRIPTION:Recently\, intensive research of single photon source is drive
 n by the applications in quantum information sciences. A single photon sou
 rce based on flying electrons carried by surface acoustic wave (SAW) is pr
 oposed. Single photon is emitted as an electron surfs with the SAW\, cross
 es a n-p junction and recombines with a hole. In order to generate the SAW
 \, search and detect the emission of single photons\, a probe with RF inpu
 t and optical scanning ability is essential. The first part of my talk foc
 uses on how we design and build this probe. In the second part\, I will di
 scuss the test of the optical scanning system\, which consists of a fibre\
 , a lens assembly\, and a piezo-driven 3-axes stepper. A chip is mounted o
 n the probe and is imaged using the optical scanning system to check the p
 erformance of the system. The lens assembly is first moved in z direction 
 to reach the focal point. A 2D scan is then carried out to find the featur
 es on the chip. The features such as optical gates\, E-beam gates and mesa
  edge are used to calibrate the asymmetric piezo movement and calculate th
 e length per step. A clear image of the chip can be obtained with proper f
 ocusing and asymmetry calibration. In addition\, it is shown that the opti
 cal scanning system can image a sub-micron scale 1D channel. After this te
 st\, the probe will soon be ready for measurement of single photon source 
 devices.
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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