Sparsity based terahertz reflective off-axis digital holography

Min Wan; Inbarasan Muniraj; Ra'ed Malallah; Liang Zhao; James P. Ryle; Lu Rong; John J. Healy; Dayong Wang; John T. Sheridan

doi:10.1117/12.2264788

15 May 2017 Sparsity based terahertz reflective off-axis digital holography

Min Wan, Inbarasan Muniraj, Ra'ed Malallah, Liang Zhao, James P. Ryle, Lu Rong, John J. Healy, Dayong Wang, John T. Sheridan

Author Affiliations +

Proceedings Volume 10233, Holography: Advances and Modern Trends V; 102330T (2017) https://doi.org/10.1117/12.2264788
Event: SPIE Optics + Optoelectronics, 2017, Prague, Czech Republic

Abstract

Terahertz radiation lies between the microwave and infrared regions in the electromagnetic spectrum. Emitted frequencies range from 0.1 to 10 THz with corresponding wavelengths ranging from 30 μm to 3 mm. In this paper, a continuous-wave Terahertz off-axis digital holographic system is described. A Gaussian fitting method and image normalisation techniques were employed on the recorded hologram to improve the image resolution. A synthesised contrast enhanced hologram is then digitally constructed. Numerical reconstruction is achieved using the angular spectrum method of the filtered off-axis hologram. A sparsity based compression technique is introduced before numerical data reconstruction in order to reduce the dataset required for hologram reconstruction. Results prove that a tiny amount of sparse dataset is sufficient in order to reconstruct the hologram with good image quality.

Citation Download Citation

Min Wan, Inbarasan Muniraj, Ra'ed Malallah, Liang Zhao, James P. Ryle, Lu Rong, John J. Healy, Dayong Wang, and John T. Sheridan "Sparsity based terahertz reflective off-axis digital holography", Proc. SPIE 10233, Holography: Advances and Modern Trends V, 102330T (15 May 2017); https://doi.org/10.1117/12.2264788

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