Ultrafast graphene-based broadband THz detector

TL;DR

This paper introduces an ultrafast, room-temperature graphene-based THz detector with broadband capabilities, characterized by a sub-10 ps response time, suitable for advanced temporal measurements.

Contribution

It demonstrates a novel graphene-based THz detector with ultrafast response times and broadband operation at room temperature, advancing THz detection technology.

Findings

Response time below 10 ps confirmed by autocorrelation measurements

Operates effectively across wavelengths from 8 to 220 micrometers

Potential for use in two-color pump-probe experiments

Abstract

We present an ultrafast graphene-based detector, working in the THz range at room temperature. A logarithmic-periodic antenna is coupled to a graphene flake that is produced by exfoliation on SiO2. The detector was characterized with the free-electron laser FELBE for wavelengths from 8 um to 220 um. The detector rise time is 50 ps in the wavelength range from 30 um to 220 um. Autocorrelation measurements exploiting the nonlinear photocurrent response at high intensities reveal an intrinsic response time below 10 ps. This detector has a high potential for characterizing temporal overlaps, e. g. in two-color pump-probe experiments.