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My early research focussed on the investigation of the optical and electronic properties of low-dimensional correlated electronic systems at millikelvin temperatures, including the use of time-resolved millikelvin magneto-photoluminescence, and single photon counting techniques, to probe the integer and fractional quantum Hall effect ground states of 2D electron and hole systems. More recently, I have collaboratively developed the field of terahertz frequency electronics and photonics, confronting major international research challenges.
A highlight of our terahertz research includes the demonstration of the first, and long-sought, terahertz frequency quantum cascade laser (QCL) by the EC consortium ‘WANTED’, which has been highlighted by the journal Nature Photonics to be one of the top photonics breakthroughs in the last 50 years. Working closely with international partners, our subsequent work quickly established the QCL as an intense, precisely controlled source of monochromatic terahertz radiation through: the first demonstrations of continuous-wave operation, and operation at >77 K both pulsed and continuous-wave; the investigation of a range of new active region designs and waveguiding configurations; and, recently, the demonstration of record output powers.
The terahertz QCL is a versatile gain medium for the manipulation and study of fundamental laser operation. Highlights include the first use of ‘spoof’ surface plasmons and the first use of photonic crystal structures both enabling the emission frequency, beam profile and output power to be engineered. Our recent demonstration of a topologically protected QCL cavity will not only create opportunities for robust device development, but will also provide a platform to explore a better fundamental understanding of topological physics and nonlinear optoelectronics. By controlling the QCL dynamics at a femtosecond timescale, we achieved the first active mode-locking of a terahertz QCL and coherent detection of the emitted pulse train, the first terahertz pulse amplifier, and the first observation (in any semiconductor laser) of the temporal evolution of the ultrafast switch-on dynamics, laser mode competition and frequency selection.
We recently achieved the first continuous-wave injection locking of a QCL using a near-infrared telecommunications frequency comb. This not only stabilizes the QCL frequency so that it becomes traceable to primary standards, but also significantly reduces the linewidth to <1 Hz, and allows the phase-locked continuous-wave QCL emission to be detected coherently. This brings the frequency precision and accuracy that are available at microwave frequencies to the terahertz region of the spectrum for the first time, and as all components are semiconductor-based, compact integration is possible.
A highlight of our terahertz research includes the demonstration of the first, and long-sought, terahertz frequency quantum cascade laser (QCL) by the EC consortium ‘WANTED’, which has been highlighted by the journal Nature Photonics to be one of the top photonics breakthroughs in the last 50 years. Working closely with international partners, our subsequent work quickly established the QCL as an intense, precisely controlled source of monochromatic terahertz radiation through: the first demonstrations of continuous-wave operation, and operation at >77 K both pulsed and continuous-wave; the investigation of a range of new active region designs and waveguiding configurations; and, recently, the demonstration of record output powers.
The terahertz QCL is a versatile gain medium for the manipulation and study of fundamental laser operation. Highlights include the first use of ‘spoof’ surface plasmons and the first use of photonic crystal structures both enabling the emission frequency, beam profile and output power to be engineered. Our recent demonstration of a topologically protected QCL cavity will not only create opportunities for robust device development, but will also provide a platform to explore a better fundamental understanding of topological physics and nonlinear optoelectronics. By controlling the QCL dynamics at a femtosecond timescale, we achieved the first active mode-locking of a terahertz QCL and coherent detection of the emitted pulse train, the first terahertz pulse amplifier, and the first observation (in any semiconductor laser) of the temporal evolution of the ultrafast switch-on dynamics, laser mode competition and frequency selection.
We recently achieved the first continuous-wave injection locking of a QCL using a near-infrared telecommunications frequency comb. This not only stabilizes the QCL frequency so that it becomes traceable to primary standards, but also significantly reduces the linewidth to <1 Hz, and allows the phase-locked continuous-wave QCL emission to be detected coherently. This brings the frequency precision and accuracy that are available at microwave frequencies to the terahertz region of the spectrum for the first time, and as all components are semiconductor-based, compact integration is possible.
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Nature Communicationsno. 1 (2024): 1-8
Alessandra Di Gaspare, Chao Song, Chiara Schiattarella,Lianhe H. Li,Mohammed Salih,A. Giles Davies,Edmund H. Linfield,Jincan Zhang,Osman Balci,Andrea C. Ferrari,Sukhdeep Dhillon,Miriam S. Vitiello
ADVANCED OPTICAL MATERIALSno. 4 (2024)
Daniel Mohun, Nikollao Sulollari,Mohammed Salih,Lianhe H. Li,John E. Cunningham,Edmund H. Linfield,A. Giles Davies,Paul Dean
Scientific Reportsno. 1 (2024): 1-14
Mohammadreza Saemian, Livia Del Balzo,Djamal Gacemi,Yanko Todorov,Etienne Rodriguez,Olivier Lopez,Benoit Darquie,Lianhe Li,Alexander Giles Davies,Edmund Linfield,Angela Vasanelli,Carlo Sirtori
NANOPHOTONICS (2024)
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