We report the potential application of 6% dimethylsulfoxide (DMSO)-doped poly (3, 4-ethylenedioxythiophene)/poly (4-styrenesulfonate) (PEDOT/PSS) as a low cost and broadband terahertz (THz) antireflection coating based on the impedance matching effect. The reflected pulses from the quartz and silicon substrates are observed to change with the thickness of the PEDOT/PSS layer. Theoretical analysis based on an equivalent transmission line circuit model and FDTD computational simulations have been used to understand the experimental results. Excellent impedance matching is achieved by a ∼39-nm-thick 6% DMSO-doped PEDOT/PSS layer on quartz, and a ∼101-nm-thick 6% DMSO-doped PEDOT/PSS layer on silicon due to the almost-frequency-independent conductivity of the thin film between 0.3 and 2.5 THz. In the critical conditions, the normalized main pulse transmission remains as high as 74% and 64%, for the quartz and silicon substrates, respectively, significantly higher than the existing state of the art THz antireflection coatings.
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Article Synopsis
- The study focuses on enhancing the performance of PEDOT: PSS, a conductive polymer used for flexible transparent electrodes, which traditionally faced limitations in research and application.
- The newly developed electrode features high conductivity (up to 1300 S cm) and excellent transparency across a wide range of wavelengths, from visible light to terahertz frequencies, enabled by DMSO doping.
- The transparent electrode demonstrates remarkable stability throughout extensive electrical cycling and high temperatures, leading to its successful application in creating a liquid crystal phase shifter with improved driving performance.
An optically rewritable and electrically erasable terahertz (THz) wavefront modulator based on indium oxide (InO) and DMSO-doped PEDOT:PSS is proposed. The modulator has a three-layer structure of InO/PEDOT:PSS/quartz, which can weaken the THz transmission under the action of light excitation. Optically written THz Fresnel plates, which can focus the input Gaussian beam into a point, were realized.
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ACS Appl Mater Interfaces
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