Transient mobility and photoconductive terahertz emission with GaP

Christopher M. Collier; Brandon Born; Xian Jin; Timothy M. Westgate; Max Bethune-Waddell; Mark H. Bergen; Jonathan F. Holzman

doi:10.1117/12.2023764

24 September 2013 Transient mobility and photoconductive terahertz emission with GaP

Christopher M. Collier, Brandon Born, Xian Jin, Timothy M. Westgate, Max Bethune-Waddell, Mark H. Bergen, Jonathan F. Holzman

Author Affiliations +

Proceedings Volume 8846, Terahertz Emitters, Receivers, and Applications IV; 884616 (2013) https://doi.org/10.1117/12.2023764
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

GaP is investigated for photoconductive terahertz (THz) generation. It is shown that the atypical bandstructure of GaP, with a central high-mobility valley and low-mobility sidevalleys, can be exploited to form a transient high-mobility state. The subsequent scattering and relaxation of hot electrons into and within the lower-mobility sidevalleys leaves the material in a relaxed low-conduction state. The experimental and theoretical study shows that ultrafast transient mobility, occurring over 800 fs, can create broadband THz pulses with reduced recovery times (and low leakage currents). The impacts of these findings are discussed for efficient and portable next-generation THz systems.

Citation Download Citation

Christopher M. Collier, Brandon Born, Xian Jin, Timothy M. Westgate, Max Bethune-Waddell, Mark H. Bergen, and Jonathan F. Holzman "Transient mobility and photoconductive terahertz emission with GaP", Proc. SPIE 8846, Terahertz Emitters, Receivers, and Applications IV, 884616 (24 September 2013); https://doi.org/10.1117/12.2023764

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