Journal
OPTICS EXPRESS
Volume 27, Issue 25, Pages 36358-36367Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.27.036358
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Funding
- European Regional Development Fund [01.2.2-LMT-K-718-01-0047]
- Lietuvos Mokslo Taryba [DOTSUT-247]
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Bessel terahertz (THz) imaging employing a pair of thin silicon multi-phase diffractive optical elements is demonstrated in continuous wave mode at 0.6 THz. A proposed Bessel zone plate (BZP) design - discrete axicon containing 4 phase quantization levels - based on high-resistivity silicon and produced by laser ablation technology allowed to extend the focal depth up to 20 mm with minimal optical losses and refuse employment of bulky parabolic mirrors in the imaging setup. Compact THz imaging system in transmission geometry reveals a possibility to inspect objects of more than 10 mm thickness with enhanced contrast and increased resolution up to 0.6 of the wavelength by applying deconvolution algorithms. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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