Dataset associated with Liquid-crystal-based controllable attenuators for terahertz-frequency quantum-cascade lasers

This archive contains the dataset associated with the publication entitled ''Liquid-crystal-based controllable attenuators for terahertz-frequency quantum-cascade lasers". There has been considerable progress in the development of terahertz-frequency (THz) radiation source and detectors, along with their potential applications in recent years. However, there remains a lack of adaptive optical components to manipulate, modulate and control THz radiation. Here, we demonstrate liquid-crystal devices (LCDs), made with a commercially available material (E7), with unbiased birefringence values of 0.14-0.18 in the 0.3-4 THz band. The LCDs were used to modulate the THz radiation generated from a 3.4-THz quantum cascade laser by up to 40%, dependent upon both the liquid crystal layer thickness and bias voltage applied. Data included are the raw time-domain data used to calculate the refractive indices and absorption coefficients shown in Figure 1, the raw time-domain data used to calculate the change in THz transmission shown in Figure 2, and an example .json file used to provide the calculation parameters to the Nelly open-access THz spectroscopy package which is available on GitHub. Also included are the raw data for Figure 3.