2024/12/24 by Kasturie Jatkar, Tien-Tien Yeh, Jatkar, Kasturie D. +5
Chemistry · Engineering · Physics and Astronomy · #FOS: Physical sciences #Optics (physics.optics) #Other Condensed Matter (cond-mat.other) #Spectroscopy and Laser Applications #Spectroscopy and Quantum Chemical Studies #Terahertz technology and applications
paper · pdf · doi:10.48550/arxiv.2412.18662
openalex publication_date 2024/12/24 · openalex created_date 2024/12/31 · openalex updated_date 2026/07/28
We introduce a systematic approach that enables two robust methods for performing terahertz time-domain spectroscopy in reflection geometry. Using the Kramers-Kronig relations in connection to accurate experimental measurements of the amplitude of the terahertz electric field, we show how the correct phase of the same field can be retrieved, even in the case of partly misaligned measurements. Our technique allows to accurately estimate the optical properties of in principle any material that reflects terahertz radiation. We demonstrate the accuracy of our approach by extracting the complex refractive index of InSb, a material with a strong plasma resonance in the low-terahertz range. Our technique applies to arbitrary incidence angles and polarization states.