Tunable Berreman mode in highly conductive organic thin films

作者：Xinlan Yu, Jiahuan Qiu, Qili Hu, Kuan-An Chen, Jun Zheng, Sen Liang, Miao Du, Hui Ye · 发表于：Optics Express · 年份：2022 · DOI：10.1364/oe.472115 · 被引用次数：10 · 研究领域：Metamaterials and Metasurfaces Applications、Plasmonic and Surface Plasmon Research、Photonic Crystals and Applications

The unique performances of Epsilon-near-zero (ENZ) materials allow them to play a crucial role in many optoelectronic devices and have spawned a wide range of inventive uses. In this paper, we found that the modified PEDOT:PSS film formed with a kind of so-called "Metastable liquid-liquid Contact (MLLC)" solution treatment method can achieve a wide tuning of ENZ wavelength from 1270 nm to 1550 nm in the near-infrared region. We further analyzed the variation trend of imaginary permittivity for these samples with different ENZ wavelengths. The Berreman mode was successfully excited by a simple structural design to realize a tunable polarization absorber.