CC BY
15THz-I-15
Graphene based sensor for THz imaging
S.Bodrov1'2, A. Murzanev1, Y.Sergeev1'2, A.Korytin1 and A.Stepanov1
1Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, 603950, Russia 2University of Nizhny Novgorod, Nizhny Novgorod, 603022, Russia
step@ufp.appl.sci-nnov.ru
Graphene-based terahertz-field-induced optical luminescence is proposed as a novel technique for THz imaging. We show that optical luminescence from single layer graphene excited by terahertz pulses with electric field amplitude above 100 kV/cm can be detected by a commercial thermally cooled CCD camera. Terahertz beam transverse distributions are measured and compared with a conventional electro-optic sampling technique. The atomic thickness of a graphene detector as well as a strong nonlinear dependence of optical luminescence on THz field make the graphene-based THz imaging a useful tool for near-field mapping. Proof-of-principle experiment of the visualization of local THz-field enhancement near a metal tip of 2 ^m radius curvature is performed.
