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Magnetic Field Enhanced Terahertz Pulse Emission From A Femtosecond Laser Excited GaSb Epitaxial Layer

I. Nevinskas, K. Vizbaras, A. Vizbaras, Augustinas Trinkunas, A. Krotkus
Published 2016 · Mathematics

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An undoped GaSb epitaxial layer has been grown on a GaAs substrate by molecular beam epitaxy. It has been found that GaSb could be a potential surface terahertz (THz) emitter photoexcited by 1.55 μm femtosecond laser pulses since the maximum optical-to-THz power conversion efficiency is at around this wavelength. The THz field strength is 10 dB weaker as compared with that generated from narrow-gap InAs at these energies of quanta. Furthermore, the samples were exposed to a constant magnetic field which enhances THz emission and allows signal registration in the line-of-sight geometry.
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