ABSTRACT
Nonlinear carrier relaxation/recombination dynamics and the resultant stimulated terahertz (THz) photon emission with excitation of surface plasmon polaritons (SPPs) in photoexcited monolayer graphene has been experimentally studied using an optical pump/THz probe and an optical probe measurement. In this chapter, the authors observe the spatial distribution of the THz probe pulse intensities under linear polarization of optical pump and THz probe pulses. Graphene has attracted increasing attention for THz and optoelectronic device applications due to its exceptional electronic and optical properties. Experimental results support the occurrence of the gain enhancement effect by the excitation of SPPs on THz stimulated emission in optically pumped monolayer graphene. To measure the in-plane spatial distributions of the THz probe pulse radiation, the optical probe pulse position was changed step-by-step by moving the incident point of the optical pump pulse. The spatial distribution of the THz probe pulse intensities under linear polarization of the optical pump and THz probe pulses was measured.
