Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session G52: Ultrafast Spectroscopy and Optical Techniques
11:30 AM–2:06 PM,
Tuesday, March 7, 2023
Room: Room 308
Sponsoring
Unit:
DLS
Chair: David Reis, Stanford PULSE Institute
Abstract: G52.00010 : Terahertz spectroscopy of bulk InSb and SrTiO3 in reflection geometry*
1:18 PM–1:30 PM
Presenter:
Kasturie Jatkar
(Stockhom University)
Author:
Kasturie Jatkar
(Stockhom University)
Collaboration:
Ultrafast Dynamics in Condensed Matter (UDCM)
Here we show a technique for measuring samples in reflection geometry using THz-TDS which involves systematically resolving the misplacement issue by first isolating and correcting sources of error in the experimental setup. We then use a novel and robust phase retrieval method to detect and rectify the remaining misplacement with nanometre precision. This provides us with precise values for the phase of the THz pulse which allows us to accurately measure the complex properties of materials. This blend of experimental as well as code-based correction returns highly reliable optical properties of materials.
We use this technique to study non-transparent materials such as InSb and SrTiO3, which were previously found to be challenging due to their strong spectral features and high reflectivity in the THz frequency range. The experimental results of incident angle and polarization-dependent measurements are shown along with the retrieved complex refractive index and conductivity of these samples. Our method immensely simplifies the procedure for obtaining optical properties of samples in the THz range, thus allowing for more advances in this field by using strong electric fields, magnetic fields, new materials, and more. We anticipate this technique can also contribute substantially to the fundamental understanding of magnetic materials.
*Stockholm University
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