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6THz-I-8
NONLINEAR AND TERAHERTS PHOTONICS
Terahertz-field-induced optical second harmonic generation and luminescence for material nonlinear diagnostic and terahertz beam
visualization
S.B. Bodrov
'University of Nizhny Novgorod, Nizhny Novgorod 603022, Russia 2Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950, Russia sergey.bodrov@ipfran.ru, bosbor@ufp.appl.sci-nnov.ru
Terahertz-field-induced second harmonic generation (TFISHG) of optical radiation was used to investigate nonlinear properties of semiconductors (silicon), dielectrics (fused quartz, tellurite and chalcogenide glasses) and two-dimensional materials (graphene). In a case of transparent materials, the TFISHG technique allows finding the third-order susceptibility not only of homogeneous samples, but also can be used to determine the nonlinearity of hidden layers inside materials. Terahertz-field-induced optical luminescence from graphene is proposed and experimentally used for imaging of strong fields THz beams (>100 kV/cm). The visualization of local THz-field enhancement near a metal tip with a 2 um radius curvature was demonstrated.
ALT'22
