Abstract-Terahertz holography for imaging amplitude and phase objects

Erwin Hack and Peter Zolliker  »View Author Affiliations

Optics Express, Vol. 22, Issue 13, pp. 16079-16086 (2014)

http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-22-13-16079

A non-monochromatic THz Quantum Cascade Laser and an uncooled micro-bolometer array detector with VGA resolution are used in a beam-splitter free holographic set-up to measure amplitude and phase objects in transmission. Phase maps of the diffraction pattern are retrieved using the Fourier transform carrier fringe method; while a Fresnel-Kirchhoff back propagation algorithm is used to reconstruct the complex object image. A lateral resolution of 280 µm and a relative phase sensitivity of about 0.5 rad are estimated from reconstructed images of a metallic Siemens star and a polypropylene test structure, respectively. Simulations corroborate the experimental results.

© 2014 Optical Society of America