研究目的
To find the power-law index at room temperature for the absorption coefficient of some amorphous polymers in the low-frequency part of the terahertz range, using the method of the pulse terahertz spectroscopy in the time-domain representation.
研究成果
The fractal approximation can be used to describe the terahertz spectrum of the polymer absorption with the formula α(ω) ∝ ωμ. The validity limits of the model and the characteristic value of the fractal exponent were estimated for several amorphous polymers.
研究不足
The study is limited to amorphous polymers at room temperature in the glassy state. The fractal approximation may not be applicable to all polymers or at different temperatures.
1：Experimental Design and Method Selection:
The study uses the method of pulse terahertz spectroscopy in the time-domain representation to measure the absorption coefficient of amorphous polymers.
2：Sample Selection and Data Sources:
Amorphous polymer samples at room temperature in the glassy state were used.
3：List of Experimental Equipment and Materials:
Broadband picosecond terahertz pulse source and polymer samples.
4：Experimental Procedures and Operational Workflow:
Transmission of a broadband picosecond terahertz pulse through the polymer sample was analyzed to measure the absorption coefficient at various frequencies.
5：Data Analysis Methods:
The absorption spectra were analyzed in the log-log scale to determine the power-law index.
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