材料研究
材料光学特性及动力学
- 太赫兹测量可单次直接确定样品复折射率
- 这为用户提供材料的结构信息,例如聚合物或复合材料。
- 该方向的活跃研究领域包括液晶,半导体以及超材料等。
- 推荐系统: TeraFlash pro, Imaging Extension, TeraFlash smart, TeraScan
由于太赫兹频率不仅对气体,同时对许多有机固体都显示吸收特征,太赫兹光谱仪的应用方向非常广泛。与所测振幅数据相搭配,折射率测量能够帮助展示样品更多的特性:对于聚合物而言,折射率随温度的变化可以显示微小的结构变化;对于纤维增强塑料,折射率可提供关于纤维束走向的信息。太赫兹光谱仪为液晶材料的分子动力学提供更多信息,同时可探测半导体材料的导电率和载流子密度等。
另一个充满活力的研究领域涉及超材料(metamaterial),例如亚波长光栅或开环振荡器,他们具有极强的传输特性,通常具有很窄的细节特性。根据设计,所对应的共振频率在添加样品(例如生物样本)时会发生变化。连续操作太赫兹系统的超强频率分辨率为这些研究提供更多附加优势。
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- Review paper: Naftaly, M., et al., Industrial applications of terahertz sensing: State of play, Sensors (2019)
- Publication: M. Yahyapour et al., Fastest thickness measurements with a terahertz time-domain system based on electronically controlled optical sampling; Appl. Sciences (2019)
- Conference Abstract: M. Yahyapour et al., Non-Contact Thickness Measurements with Terahertz Pulses, WCNDT 2016
- Publication: A. Deninger et al., 2.75 THz tuning with a triple-DFB laser system at 1550 nm and InGaAs photomixers; J Infrared Milli. Terahz. Waves 36:3 (2015)
- Publication: N. Vieweg et al., Terahertz-time domain spectrometer with 90 dB peak dynamic range; J Infrared Milli. Terahz. Waves 35:10 (2014)
- Publication: A. Roggenbuck et al., Using a fiber stretcher as a fast phase modulator in a continuous wave terahertz spectrometer; JOSA B 29:4 (2012)
- Publication: D. Stanze et al., Compact cw terahertz spectrometer pumped at 1.5 nm wavelength; J Infrared Milli. Terahz. Waves 32:2 (2011)
- Publications: A. Roggenbuck et al., Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples; New J. Phys. 12 (2010)
- Article: Laser-based terahertz generation & applications
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