Absorption-sensitive diffuse reflection imaging of concealed powders using a terahertz quantum cascade laser | Zendy

Paul Dean | Zendy; M. U. Shaukat | Zendy; Suraj P. Khanna | Zendy; Subhasish Chakraborty | Zendy; Mohammad Lachab | Zendy; Andrew Burnett | Zendy; A. G. Davies | Zendy; E. H. Linfield | Zendy

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Absorption-sensitive diffuse reflection imaging of concealed powders using a terahertz quantum cascade laser

Author(s) -

Paul Dean,

M. U. Shaukat,

Suraj P. Khanna,

Subhasish Chakraborty,

Mohammad Lachab,

Andrew Burnett,

A. G. Davies,

E. H. Linfield

Publication year - 2008

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.16.005997

Subject(s) - materials science , optics , terahertz radiation , attenuation coefficient , absorption (acoustics) , laser , diffuse reflection , reflection (computer programming) , scattering , quantum cascade laser , total internal reflection , terahertz spectroscopy and technology , optoelectronics , physics , computer science , programming language

We report diffuse reflection imaging in air of concealed powdered samples using a terahertz quantum cascade laser. The sensitivity of the detection scheme to sub-surface absorption within samples is confirmed using fully-characterized powdered admixtures of polystyrene and polymethyl methacrylate (PMMA). Measurements of the backscattering intensity from these samples are then used in conjunction with Kubelka-Munk scattering theory, as well as several models based on the quasi-crystalline approximation, to extract the absorption coefficient of PMMA. Our research demonstrates the feasibility of high-resolution frequency-domain terahertz imaging for the detection and identification of concealed powders in a reflection geometry.

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