Topological materials as promising candidates for tuneable helicity-dependent terahertz emitters

Jessica L. Boland; Djamshid A. Damry; Chelsea Q. Xia; Yahya Saboon; Abdul Mannan; Piet Schönherr; Dharmalingam Prabhakaran; Laura M. Herz; Thorsten Hesjedal; Michael B. Johnston

doi:10.1117/12.2681745

4 October 2023 Topological materials as promising candidates for tuneable helicity-dependent terahertz emitters

Jessica L. Boland, Djamshid A. Damry, Chelsea Q. Xia, Yahya Saboon, Abdul Mannan, Piet Schönherr, Dharmalingam Prabhakaran, Laura M. Herz, Thorsten Hesjedal, Michael B. Johnston

Author Affiliations +

Proceedings Volume 12683, Terahertz Emitters, Receivers, and Applications XIV; 1268302 (2023) https://doi.org/10.1117/12.2681745
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

Topological materials have rapidly gained interest as contenders for development of coherent, controllable terahertz emitters. Possessing Weyl nodes either at the surface or within the bulk, they host spin-polarised, helicity-dependent currents that offer possibility to control the emitted THz pulse by changing the polarization of the optical pulses generating the radiation. Here, we show that upon near-infrared excitation at oblique incidence, multi-cycle pulses are generated with a narrow bandwidth of ∼0.4 THz for cadmium arsenide bulk crystals and nanowire ensembles. Both the bandwidth and peak emission frequency of the generated THz radiation can be tuned by respectively varying the photon helicity and angle of incidence of the photoexcitation light.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jessica L. Boland, Djamshid A. Damry, Chelsea Q. Xia, Yahya Saboon, Abdul Mannan, Piet Schönherr, Dharmalingam Prabhakaran, Laura M. Herz, Thorsten Hesjedal, and Michael B. Johnston "Topological materials as promising candidates for tuneable helicity-dependent terahertz emitters", Proc. SPIE 12683, Terahertz Emitters, Receivers, and Applications XIV, 1268302 (4 October 2023); https://doi.org/10.1117/12.2681745

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