Analysis of Terahertz Time Domain Spectroscopy: Material Parameters Modelling and Numerical Recipe for Fabry-Perot Oscillations Removal

Nandhalalan, S. (2023) Analysis of Terahertz Time Domain Spectroscopy: Material Parameters Modelling and Numerical Recipe for Fabry-Perot Oscillations Removal. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS dissertation of Nandhalalan S (18MS018)) Thesis_18MS018.pdf - Submitted Version Restricted to Repository staff only Download (3MB)

Abstract

In the first part of the project, the analysis of the C₀V₂O₆ Terahertz Time Domain Spectroscopy data measured at different temperatures (7K-295K) was done, and the extracted AC conductivity was modelled using different conductivity models. The absorption coefficient extracted at all temperatures exhibited a peak centred around 0.82 THz, which is observed for this sample, is being attributed to zero field splitting due to the magnetic-induced dipole transitions. In the second part of the project, the main aim is to investigate the oscillations in the extracted material parameters due to Fabry Perot interference effects. Two numerical methods are discussed to remove the fictitious oscillations due to the multiple reflections inside the sample in the THz TDS transmission mode. Both methods successfully remove these fictitious oscillations reasonably well, and the efficiency of the methods in removing Fabry Perot interference effects are compared for two thick samples - Sapphire(thickness of 430 μm) and Silicon (thickness of 500 μm).

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