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Detecting the full polarisation state of terahertz transients

E. Castro-Camus·J. Lloyd-Hughes·M. D. Fraser·H. H. Tan·C. Jagadish·M. B. Johnston
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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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E. Castro-Camus, J. Lloyd-Hughes, M. D. Fraser, H. H. Tan, C. Jagadish, M. B. Johnston. 2006-03-14. Detecting the full polarisation state of terahertz transients. https://doi.org/10.1117/12.660717

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