Ultrafast
Science Group Steve
Andrews
M 
Research interests: investigation of fundamental quantum processes in optically excited semiconductors using ultrafast optical techniques such as time domain THz spectroscopy, development of THz spectroscopic techniques and optoelectronic devices.
Group Members: Dr Steve Andrews, Chris Williams (PhD student), Ali Hussain
(PhD student):
Current research Projects:
THz time domain spectroscopy of semiconductor materials including quantum wells and two dimensional electron gases, development of THz devices such as detectors and waveguides and sensors based on metamaterials (in collaboration with S. A. Maier).
Facilities:
70 fs and 10 fs near infrared laser oscillators. Spectrometer for THz emission, transmission and visible pump-THz probe experiments between 0.1 and 3 THz at temperatures down to 1.6 K and magnetic fields up to 7 T using photoconducting transmitters and receivers. Fiber coupled THz spectrometer for scattering measurements. 50 THz bandwidth spectrometer based on nonlinear optical few cycle generation and either photoconductive or electro-optic detection. Apparatus for standard cw measurements such as photoluminescence. Access to in-house cleanroom for optical and e-beam lithography, deposition, reactive ion etching etc
Some THz publications :
‘Coherent control of cyclotron emission from a semiconductor using sub-picosecond electric field transients’ P G Huggard, J A Cluff, C J Shaw, S R Andrews, E H Linfield and D A Ritchie Appl. Phys. Lett. 71, 2647 (1997)
‘Magnetic field suppression of THz charge oscillations in a double quantum well’ S R Andrews, P G Huggard, C J Shaw, J A Cluff, O E Raichev and R Grey Phys. Rev B57, R9443 (1998)
‘Polarisation-dependent efficiency of photoconducting THz transmitters and receivers’ P G Huggard, C J Shaw, J A Cluff and S R Andrews Appl. Phys. Lett. 72, 2069 (1998)
‘THz emission from asymmetric double quantum wells’ S R Andrews, P G Huggard, C J Shaw, J A Cluff and R Grey in ‘Terahertz spectroscopy and applications II’ ed J M Chamberlain Proc SPIE Vol 3828, p244-253 (1999)
‘Mechanism of THz emission from coupled quantum wells’ P G Huggard, C J Shaw, S R Andrews, J A Cluff and R Grey Phys. Rev. Letts. 84, 1023-1026 (2000)
‘Drude conductivity of highly doped GaAs at terahertz frequencies’ P G Huggard, J A Cluff, G P Moore, C J Shaw, S R Andrews, S R Keiding, E H Linfield and D A Ritchie J Appl. Phys. 87, 2382-2385 (2000)
'Magnetic field dependence of THz emission from an optically excited GaAs p-i-n diode' S R Andrews, A Armitage, P GHuggard, C J Shaw and G P Moore Phys Rev. B66, 085307 (2002)
'Optimization of photoconducting receivers for THz spectroscopy' S R Andrews, A Armitage, P G Huggard and A Hussain Phys. Med. Biol. 47, 3705-3710 (2002)
‘Ultrafast Optical Excitation of Coherent Two-Dimensional Plasmons’ A Armitage, S R Andrews, J A Cluff, E H Linfield and D A Ritchie Phys Rev B 69, 125309 (2004)
‘Dynamic
range of ultrabroadband terahertz detection using GaAs photoconductors’ A Hussain and S R Andrews, Appl. Phys. Lett. 88, 143514 (2006)
‘Terahertz pulse propagation using plasmon-polariton-like surface modes on structured conductive surfaces ‘, S A Maier and S R Andrews, Appl. Phys. Letts. 88, 251120 (2006)
Previous group members:
Dr Peter Huggard, Dr Adam Armitage, Dr Julian Cluff, Dr Graeme Moore, Chris
Shaw
If I don’t reply quickly to an e-mail then I am probably somewhere more interesting:
