Abstract-Active bidirectionally controlled terahertz interference fringe shift in DMSO-doped PEDOT:PSS film

Applied Physics Letters

Jingyu Liu, Bin Liu, Dandan Liu, Luyao Xiong, Jingling Shena, Bo Jingyu Liu, Bin Liu, Dandan Liu, Luyao Xiong, Jingling Shena,  Bo Zhanga

https://aip.scitation.org/doi/abs/10.1063/5.0011845

An active bidirectionally controlled terahertz interference fringe shift in a dimethyl sulfoxide (DMSO)-doped poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) film structure was investigated. An interference phenomenon that occurred as a result of wavefront segmentation in a THz time-domain spectroscopy (THz-TDS) system was observed. This THz interference fringe spectrum can be modulated bidirectionally through application of a bias voltage and laser irradiation in terms of its both THz amplitude and interference fringe peaks. The refractive index of the film has an effect on the frequency domain and causes both optical path enhancement and a change in the interference period. THz interference fringes with an electrically induced blueshift and with a photo-induced redshift were acquired.