Terahertz-field-induced optical luminescence from graphene for imaging and near-field visualization of a terahertz field

Graphene-based terahertz (THz)-field-induced optical luminescence (GB-TFIOL) is proposed in this Letter as a novel, to the best of our knowledge, THzimaging technique. We experimentally show that two-dimensional distribution of the optical luminescence from a monolayer graphene traces the beam profile of the pump THz radiation. The atomic thickness of a graphene detector, as well as a strong nonlinear dependence of optical luminescence on THz field, make the GB-TFIOL technique a useful tool for near-field mapping. A proof-of-principle experiment of the visualization of local THz-field enhancement near a metal tip with a 2 mu m radius curvature was performed. (C) 2021 Optical Society of America.

Automated summary

The study introduces a novel graphene-based terahertz-field-induced optical luminescence (GB-TFIOL) technique for near-field mapping, demonstrating its application in visualizing local terahertz-field enhancement through experimental proof-of-principle.