Title :
THz spectroscopy with ultrahigh sensitivity
Author :
Brucherseifer, M. ; Pellemans, H.P.M. ; Haring Bolivar, P. ; Kurz, H.
Author_Institution :
Inst. fur Halbleitertech. II, Tech. Hochschule Aachen, Germany
Abstract :
Summary form only given.Although THz radiation has been used successfully for several applications the signal-to-noise ratio is mostly restricted to 10/sup 4/ to 10/sup 6/ in intensity. Especially for thin films of material the absorption and time delay of a THz pulse are mostly too low to be detected. We show a new method to enhance the sensitivity of THz spectroscopy to relative changes of 10/sup -10/ in intensity by shaking a sample through the focus of a THz beam and using lock-in detection on the shaking frequency.
Keywords :
differential detection; optical pulse generation; submillimetre wave spectroscopy; time resolved spectroscopy; differential signal; lock-in detection; sample shaking; sensitivity enhancement; shaking frequency; terahertz beam focus; terahertz spectroscopy; ultrahigh sensitivity; Delay effects; Laser beams; Magnetic fields; Resists; Sampling methods; Spectroscopy;
Conference_Titel :
Lasers and Electro-Optics, 2000. (CLEO 2000). Conference on
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
1-55752-634-6
DOI :
10.1109/CLEO.2000.907380
