Terahertz holography for imaging amplitude and phase objects | Zendy

Erwin Hack | Zendy; Peter Zolliker | Zendy

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Terahertz 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.

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