Journal of Physical Chemistry & Biophysics
Open Access

Experimenatal characterization of bi-directional terahertz emission from gold-coated nanogratings

International Conference and Exhibition on Lasers, Optics & Photonics

October 07-09, 2013 Hilton San Antonio Airport, TX, USA

Frank Garwe

Accepted Abstracts: J Phys Chem Biophys

Abstract :

The THz radiation emission of Au-coated nanogratings (fused silica substrate, 30 nm Au layer thickness, 500 nm grating constant) upon fs laser irradiation (785 nm, 150 fs, 1 kHz, <1 mJ/pulse) is observed in both directions along the laser beam axis (forward and backward) and for both, illumination of the Au/air or the Au/silica interface. THz radiation along the laser beam propagation is emitted in a narrow solid angle of about 15° fwhm independent on the laser pulse fluence, the angle of incidence on the nanograting profile. The bar width and the groove depth of the nanograting as well as the angle of laser beam incidence strongly affect the THz radiation yield. The energy of single THz light pulses is measured absolutely (2 fJ in the 0.3?0.38 THz range) using a highly sensitive and fast superconducting transition edge sensor. The bi-directional emission of THz radiation is in agreement with the model assumption of surface plasmon polaritons propagating simultaneously on both Au layer interfaces (Au/air and Au/silica).

Biography :

Frank Garwe has completed his Ph.D. in the field of Polymer Physics at the Martin Luther University Halle (Germany). After eight years industrial experience, he worked at the Friedrich Schiller University Jena on the field of medical applications of femtosecond lasers and on the field of negative index materials. Today?s research topics at the IPHT Jena are graphene plasmonics, long range excitation transfer on DNA molecules and THz generation at nanostructures. He has published more than 25 papers in reputed journals, and the most cited article was 200.