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

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Abstract

Graphene-based terahertz (THz)-field-induced optical luminescence (GB-TFIOL) is proposed in this Letter as a novel, to the best of our knowledge, THz imaging 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 µm radius curvature was performed.

© 2021 Optical Society of America

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Data Availability

The experimental data presented in this Letter may be obtained from the authors upon reasonable request.

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