Open AccessTerahertz holography for imaging amplitude and phase objects
Author(s) -
Erwin Hack,
Peter Zolliker
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.016079
Subject(s) - optics , holography , beam splitter , microbolometer , physics , phase (matter) , monochromatic color , terahertz radiation , diffraction , detector , amplitude , reference beam , phase retrieval , fourier transform , laser , bolometer , quantum mechanics
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.