Detecting the full polarisation state of terahertz transients
E. Castro-Camus, J. Lloyd-Hughes, M.D. Fraser, H.H. Tan, C. Jagadish, and M.B. Johnston
TL;DR
This paper introduces a novel terahertz polarisation detector capable of recording the full polarisation state of THz pulses in real-time, enabling advanced polarisation-sensitive spectroscopy.
Contribution
The authors present a new three-electrode photoconductive receiver that captures the electric field in two orthogonal directions simultaneously, improving THz polarisation detection.
Findings
Achieved a cross polarised extinction ratio better than 390:1.
Demonstrated the device's potential for polarisation-sensitive THz spectroscopy.
Discussed design optimization and applications in circular dichroism spectroscopy.
Abstract
We have developed a detector which records the full polarisation state of a terahertz (THz) pulse propagating in free space. The three-electrode photoconductive receiver simultaneously records the electric field of an electromagnetic pulse in two orthogonal directions as a function of time. A prototype device fabricated on Fe+ ion implanted InP exhibited a cross polarised extinction ratio better than 390:1. The design and optimisation of this device are discussed along with its significance for the development of new forms of polarisation sensitive time domain spectroscopy, including THz circular dichroism spectroscopy.
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