Enhanced laser pulse confinement in a photoconductive terahertz emitter through near-field sapphire-fiber microlens
Lavrukhin D. V.1, Galiev R. R.1, Zenchenko N. V.1, Khabibullin R. A.1, Kurlov V. N.2, Goncharov Yu. G.3, Zaytsev K. I.3, Garnov S. V.3, Ponomarev D. S.1,3
1National Research Center “Kurchatov Institute”, Moscow, Russia
2Osipyan Institute of Solid State Physics RAS Russian Academy of Sciences Chernogolovka, Moscow District, Russia
3Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
Email: ponomarev_dmitr@mail.ru
Near-field laser pulse confinement via specific sapphire-fiber microlens in a large-area photoconductive terahertz (THz) emitter is experimentally verified. We demonstrate that the proposed sapphire-fiber microlens provides a ~= 5-fold increase in emitted THz power, contributing to +6.5 dB in the signal-to-noise ratio and preserving the 2.5 THz spectral bandwidth. Keywords: terahertz frequency, photoconductive antenna, THz emitter, sapphire fiber, near-field localization.
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