James Lloyd-Hughes
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Professor
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James Lloyd-Hughes is an Associate Professor at the University of Warwick, United Kingdom. His research areas encompass terahertz spectroscopy, nonlinear optics, and the structural chemistry of perovskites and graphene-based materials. His recent publications include advancements in terahertz harmonic generation, dual-beam spectroscopy, and the optoelectronic properties of layered perovskites. He is also focused on understanding carrier transport dynamics and photoluminescence in two-dimensional materials.
Articles (20)
Active THz beam shaping using a one-dimensional array of photoconductive emitters
The spatial profile of a beam of pulsed terahertz (THz) radiation is controlled electrically using a multi-pixel photoconductive emitter, which consists of an array of interdigitated electrodes fabricated on semi-insulating GaAs. Activating individual pixels allows the transverse position of the THz beam's focus to be varied off-axis, as verified by spatial beam profiles. Enabling multiple pixels simultaneously permits non-Gaussian beam shapes to be created. The diffraction-limited performance of the system is established by comparison with the Abbé and Sparrow criteria, and a condition for effective beam steering using this design is derived. The spatial resolution of the approach is linked to the frequency of the THz radiation and the f-number of the collection optic.
Year:
2023
Collaborators (16)
Jessica Louise Boland
The University of Manchester
Abdul Wadood Tadbier
University of Cambridge
Pablo Docampo
University of Glasgow
Rebecca L. Milot
University of Warwick
Igor Marko
University of Glasgow
Maurizio Monti
Aarhus University
Eric Faulques
Université de Lille
Sophie Pain
Assistant Professor/Royal Academy of Engineering Research Fellow
University of Warwick
Jeremy Sloan
Reader
University of Warwick
Chunhui Yao
University of Cambridge
Imalka Jayawardena
Lecturer
University of Surrey
David Quigley
Professor
University of Warwick
Jie Liu
University of Warwick
Riccardo Degl'Innocenti
Senior Lecturer in Photonics Engineering
Queen Mary University of London
Paulo Medeiros
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Jan Verlet
Professor
University of Durham

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