Portal de Periódicos da CAPES

Ultrafast graphene-based broadband THz detector

2013; American Institute of Physics; Volume: 103; Issue: 2 Linguagem: Inglês

10.1063/1.4813621

1520-8842

Martin Mittendorff, Stephan Winnerl, J. Kamann, J. Eroms, D. Weiß, H. Schneider, M. Helm,

Superconducting and THz Device Technology

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.