Semiconductor Physics Group
Semiconductor Physics Group, Cavendish Laboratory
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Joshua FreemanE-mail: jrf40 atSign cam.ac.ukOffice phone number: +44 (0)1223 768142 Fax: +44 (0)1223 337271 Secretary: +44 (0)1223 337482 Address:
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I am a Post-doc at the Cavendish Laboratory, University of Cambridge, and a member of King's College.
My supervisor is Prof. David Ritchie.
Research interests:
- Terahertz Quantum Cascade Lasers
Publications:
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J. R. Freeman, J. Madeo, A. Brewer, S. Dhillon, O. P. Marshall, N. Jukam,
D. Oustinov, J. Tignon, H. E. Beere, and D. A. Ritchie, Dual wavelength
emission from a terahertz quantum cascade laser, Appl. Phys. Lett.
96(5), 051120 (2010).
H. Beere, J. Freeman, O. Marshall, C. Worrall, and D. Ritchie, The reproducibility and transferability of a THz quantum cascade laser design between two MBE growth manufacturers platforms, J. Cryst. Growth 311(7), 1923 (Mar. 2009).
J. R. Freeman, O. P. Marshall, H. E. Beere, and D. A. Ritchie, Electrically switchable emission in terahertz quantum cascade lasers, Opt. Express 16(24), 19830 (Nov. 2008).
J. R. Freeman, O. P. Marshall, H. E. Beere, and D. A. Ritchie, Improved wall-plug efficiency of a 1.9THz quantum cascade laser by an automated design approach, Appl. Phys. Lett. 93, 191119 (2008).
R. Rungsawang, O. Marshall, J. R. Freeman, H. E. Beere, S. Malik, J. Alton, S. Barbieri, and D. A. Ritchie, Intensity detection of terahertz quantum cascade laser radiation using electro-optic sampling, Appl. Phys. Lett. 93(19), 191111 (2008).
O. P. Marshall, V. Apostolopoulos, J. R. Freeman, R. Rungsawang, H. E. Beere, and D. A. Ritchie, Surface-emitting photonic crystal terahertz quantum cascade lasers, Applied Physics Letters 93(17), 171112 (2008).
J. R. Freeman, C. Worrall, V. Apostolopoulos, J. Alton, H. Beere, and D. A. Ritchie, Frequency Manipulation of THz Bound-to-Continuum Quantum- Cascade Lasers, IEEE Photonic. Tech. L. 20(4), 303 (2008).
(An up-to-date list can also be found here.)
Conference Papers:
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J. R. Freeman, H. E. Beere, and D. A. Ritchie, Dual frequency emission
from heterogeneous THz quantum cascade lasers, in Tenth international
conference on Intersbband transitoins in quantum wells, Montreal, Canada,
2009.
J. R. Freeman, O. Marshall, H. E. Beere, and D. A. Ritchie, Electrically switchable emission in THz quantum cascade lasers, in UK Semiconductors Conference, 2009.
Cunnell, Luce, J. Collins, R. Rungsawang, J. R. Freeman, D. A. Ritchie, M. L. Johns, A. Zeitler, and H. Beere, Quantification of Emulsified Water Content in Crude Oil Using a Terahertz Quantum Cascade Laser, in 34th International Conference on Infrared, Millimeter, and Terahertz Waves, 2009.
J. Freeman, O. Marshall, H. Beere, and D. Ritchie, Electrically switchable emission in THz quantum cascade lasers, in International quantum cascade laser summer school and workshop, Monte Vertia, Switzerland, 2008.
J. Freeman, C. Worrall, V. Apostolopoulos, J. Alton, H. Beere, and D. David Ritchie, Frequency tuning of THz bound-to-continuum quantum cascade lasers, in Ninth international conference on Intersbband transitoins in quantum wells, Ambleside, UK, 2007.
