Abstract-Cost-efficient delay generator for fast terahertz imaging

T. Probst, A. Rehn, S. F. Busch, S. Chatterjee, M. Koch, and M. Scheller  »View Author Affiliations

Optics Letters, Vol. 39, Issue 16, pp. 4863-4866 (2014)
http://dx.doi.org/10.1364/OL.39.004863

http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-39-16-4863

We present a fast and low-cost delay generator for terahertz (THz) waves that transfers a rotational motion of a transparent dielectric cube into an effective THz delay. The device is easily implemented in the THz beam path and allows for coherent sampling over 40 ps with a scan rate of hundreds of hertz. Furthermore, we show that our approach is particularly suitable for fast THz imaging.

© 2014 Optical Society of America

Abstract-Terahertz plastic compound lenses

M. Wichmann, A. S. Mondol, N. Kocic, S. Lippert, T. Probst, M. Schwerdtfeger, S. Schumann, T. Hochrein, P. Heidemeyer, M. Bastian, G. Bastian, and M. Koch  »View Author Affiliations http://www.opticsinfobase.org/ao/abstract.cfm?uri=ao-52-18-4186

We present terahertz (THz) lenses made of highly refracting polymeric compounds which provide a better focusing performance and an increased functionality in comparison to conventional THz lenses. Using mixtures consisting of polypropylene (PP) and alumina as well as PP and zinc sulfide allows a significant increase of the refractive index while simultaneously keeping a low extinction and dispersion. With these new material combinations, lenses with an increased focusing capability are realized. This is evaluated by focal plane measurements using a fiber coupled THz time-domain spectrometer.