Temperature-dependent optical and dielectric properties of polyvinyl chloride and polystyrene blends in terahertz regime

IF 3.1 3区物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Infrared Physics & Technology Pub Date : 2024-09-01 DOI:10.1016/j.infrared.2024.105546

Naima Farman, Muhammad Mumtaz, M. Ahsan Mahmood, A.H. Dogar, Sadia Tahir, Kashif Raza, Izhar Ahmad

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Abstract

Terahertz time-domain spectroscopy (THz-TDS) has been used to study the temperature-dependent refractive index, absorption coefficient and dielectric constant of polyvinyl chloride/polystyrene (PVC/PS) blends in frequency range of 0.2–1.8 THz. Moreover, the Sellmeier and thermo optic coefficients of PVC/PS blends with different weight ratios have been explored in the temperature range of 25–80 °C. These parameters are used to evaluate the dispersion properties of these blends in the observed frequency range. A clear indication of temperature dependence on the values of refractive index and the real dielectric constant of these blends have been observed. Their values decrease linearly with increasing temperature up to 80 °C. Whereas, no noticeable change has been observed in the imaginary dielectric constant and the absorption coefficient. These results provide a database of temperature-dependent optical and dielectric parameters of PVC/PS polymer blends for their efficient utilization for device fabrication in THz technology.

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太赫兹机制下聚氯乙烯和聚苯乙烯混合物随温度变化的光学和介电特性

太赫兹时域光谱（THz-TDS）被用来研究聚氯乙烯/聚苯乙烯（PVC/PS）混合物在 0.2-1.8 太赫兹频率范围内随温度变化的折射率、吸收系数和介电常数。此外，还探讨了不同重量比的聚氯乙烯/聚苯乙烯混合物在 25-80 °C 温度范围内的塞尔迈尔系数和热光学系数。这些参数用于评估这些混合物在观测频率范围内的分散特性。结果表明，这些混合物的折射率和实际介电常数的值与温度有明显的关系。它们的值随着温度的升高呈线性下降，最高温度可达 80 °C。而虚介电常数和吸收系数则没有明显变化。这些结果提供了 PVC/PS 聚合物共混物随温度变化的光学和介电参数数据库，可用于太赫兹技术中的器件制造。

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来源期刊

Infrared Physics & Technology 物理-光学

CiteScore

5.70

自引率

12.10%

发文量

400

审稿时长

67 days

期刊介绍： The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.