Summary of Tomas Jemson's activities
A single photon correlation spectroscopy (SPCS) setup is used to measure the time differences between subsequent photons that are emitted from a sample. The measurements are performed on quantum dots (QD), i.e nanoscopic inclusions with certain chemical composition in a semiconductor. A QD acts like an atom and sends out one photon at a time, a feature that SPCS is designed to measure. SPCS can also reveal in which temporal order photons are emitted from a sample
The newly built setup is optimized for UV, and the main focus is measurements on InGaN QDs. This material is already at use in white light LEDs and it could provide a way to secure encryption.
The measurement idea originates from the fifties when two researchers (Hanbury-Brown and Twiss) found a new method to measure the diameter of stars!
Selected publications & conference contributions
- Linearly polarized single photon antibunching from a site-controlled InGaN quantum dot
Tomas Jemsson, Houssaine Machhadani, K. Fredrik Karlsson, Chih-Wei Hsu and Per-Olof Holtz
Appl. Phys. Lett. 105, 081901 (2014) (featured article)
- Polarized single photon emission and photon bunching from an InGaN quantum dot on a GaN micropyramid
Tomas Jemsson, Houssaine Machhadani, Per-Olof Holtz, and K. Fredrik Karlsson
Nanotechnology 26 065702 (2015)
Responsible for this page: Fredrik Karlsson
Last updated: 01/20/15