Abstract

We describe the design, build and characterization of a novel two-output port configuration for a THz-Time Domain Spectroscopy (TDS) system. By introducing a tilted THz ultra-broadband polarizer, we split the THz beam in two orthogonal polarization detector branches. The probe laser is similarly split (with an optical polarizer) replicating the detection chain to obtain two independent orthogonal polarization detection units. We describe the system’s performance highlighting some of the advantages of this system in one of its two modes of operation: optimized polarimetry for Jones matrix measurements. A bi-refringent sapphire standard was measured to confirm its capabilities and assess the performance of the system showing good agreement with existing literature data.

Highlights

  • We describe the design, build and characterization of a novel two-output port configuration for a THz-Time Domain Spectroscopy (TDS) system

  • We show how a THz TDS system can be modified with the use of an ultra-broadband THz polarizer[31] combined with the duplication of the detection chain of a standard THz TDS system to optimize it for use in polarimetry studies

  • The laser is shared with other TDS systems providing an average power of 1300 mW to the pump beam for this dual-port system incident on a “home” grown gallium arsenide photoconductive antenna (PCA) to radiate THz power

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Summary

Introduction

Build and characterization of a novel two-output port configuration for a THz-Time Domain Spectroscopy (TDS) system. An additional application of this system is available in measurements where full information polarimetry is not required In this case the sample to be measured can be placed downstream from the THz polarizing beam-splitter, allowing one to perform simultaneous sample and reference measurements in one single stage scan. This procedure avoids many of the uncertainties introduced by the variation of temperature, humidity and laser source power across the duration of scans. This second mode of operation is not explored in this paper

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