Oxford Terahertz Photonics Group

University of Oxford > Physics > Condensed Matter > THz Photonics

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Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, UK
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The Oxford Terahertz Photonics Group is a research group within the sub-department of Condensed Matter Physics, which is part of the sub-faculty of Physics at the University of Oxford. We are also a member of Oxford's SeMicoNDuctors linkage group. We study low-energy processes in semiconductors and nanostructures on a femtosecond time-scale. Our research also involves developing novel spectroscopic techniques, for example we have recently developed a new method of terahertz time domain spectroscopy which allows the full polarisation state of terahertz pulses to be recovered.

For enquires about the group please contact:
Dr Michael B. Johnston (group leader), M.Johnston@physics.ox.ac.uk
Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, United Kingdom.

Latest Publications

Extraction of the anisotropic dielectric properties of materials from polarization-resolved terahertz time-domain spectra: Castro-Camus et al. J. Opt. A-Pure Appl. Opt., 11:105206 (Oct 2009)
[ pdf ][ ref ]
The mathematical formalism for analysing polarization-resolved terahertz time-domain data is presented, and particular cases including birefringence, optical activity and circular dichroism are discussed.
Carrier Lifetime and Mobility Enhancement in Nearly Defect-Free Core--Shell Nanowires Measured Using Time-Resolved Terahertz Spectroscopy: Parkinson et al. Nano Lett., 9:3349–3353 (Sep 2009)
[ pdf ][ ref ]
We demonstrate that two-temperature growth of the GaAs Nanowires leads to an almost doubling in charge-carrier mobility and a tripling of carrier lifetime. We also show that overcoating the nanowires enhances the charge conductivity.
Terahertz Excitonic Response of Isolated Single-Walled Carbon Nanotubes: Xu et al. J. Phys. Chem. C, 113:18106--18109 (Sep 2009)
[ pdf ][ ref ]
We have investigated the ultrafast far-infrared transmission of isolated single-walled carbon nanotubes using optical-pump THz-probe spectroscopy.

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News

Virtual THz spectrometer launched: [Oct 2009] We have added some animations to this site to help explain the techniques of THz-TDS and Optical Pump Terahertz Probe spectroscopy (OPTPS) .
Katherine Dunn wins Gibbs Prize: [Sept 2009] Katherine Dunn has won the 2009 Gibbs Prize for the best use of experimental apparatus in a MPhys project for her project "Terahertz emission from semiconductors".