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