Bi-directional terahertz emission from gold coated nanogratings by excitation via femtosecond laser pulses

in: Applied Physics B-Lasers and Optics (2011)
Garwe, Frank; Schmidt, Albrecht; Zieger, Gabriel; May, Torsten; Wynne, Klaas; Hübner, Uwe; Zeisberger, Matthias; Paa, Wolfgang; Stafast, Herbert; Meyer, Hans-Georg
We report on the investigation of terahertz (THz) emission from gold coated nanogratings (500 nm grating constant) upon femtosecond laser irradiation (785 nm, 150 fs, 1 kHz, ≤1 mJ/pulse). Unlike common assumptions, THz emission - both in the direction of laser propagation and reverse - is not only observed in case of rear side irradiation (through substrate) of the nanograting, but also in case of front side excitation (through air). Based on that we suggest a new approach to describe the newly observed phenomenon. Using a highly sensitive and fast superconducting transition edge sensor (TES) as calorimeter it was possible to directly measure the absolute energy of the emitted THz pulses in a defined spectral and spatial range, enabling for the first time a quantitative analysis of the THz emission process.

DOI: Array

Third party cookies & scripts

This site uses cookies. For optimal performance, smooth social media and promotional use, it is recommended that you agree to third party cookies and scripts. This may involve sharing information about your use of the third-party social media, advertising and analytics website.
For more information, see privacy policy and imprint.
Which cookies & scripts and the associated processing of your personal data do you agree with?

You can change your preferences anytime by visiting privacy policy.