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Ultrafast Photoexcitation and Transient Mobility of GaP for Photoconductive Terahertz Emission

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5 Author(s)
Christopher M. Collier ; University of British Columbia, Kelowna, Canada ; Brandon Born ; Max Bethune-Waddell ; Xian Jin
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The prospects for photoconductive (PC) terahertz (THz) generation are studied for wide-bandgap semiconductors exhibiting transient mobility. Such semiconductors offer practical benefits (by resisting dielectric breakdown and minimizing Joule heating) as well as improved frequency responses (by accentuating high-frequency PC THz emission). It is shown that GaP can offer these wide-bandgap and transient mobility characteristics. The ultrafast photoexcitation and subsequent transient mobility are investigated for a GaP PC THz emitter with photoexcitation fluences of 18, 36, and 72 μJ/cm2. The 100 fs rise and 700 fs fall in the transient photocurrent, due to the respective photoexcitation and transient mobility responses, yields far-field THz emission that improves upon that of the well-established GaAs PC THz emitter. It is ultimately found that semiconductors with both wide-bandgap and transient mobility characteristics can offer strategic improvements for emerging high-power PC THz technologies.

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IEEE Journal of Quantum Electronics  (Volume:49 ,  Issue: 8 )