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Terahertz Attenuated Total Reflection Measurement Module
Product Introduction
The terahertz attenuated total reflection (ATR) test is specifically designed for evaluating samples that exhibit strong absorption of incident terahertz light. The core component of the ATR module in the terahertz band is a high-resistance silicon (HRSi) prism, which exhibits a flat and highly consistent refractive index across the terahertz range (0.1–4 THz), with a refractive index of approximately 3.416 in this frequency range.
As shown in the figure below, a terahertz beam passes through a high-refractive-index high-resistance silicon (HRSi) prism and strikes a sample with low refractive index. It undergoes total internal reflection at the interface between the sample and HRSi; during this process, the terahertz beam penetrates the sample to a certain depth, and the evanescent wave generated by total internal reflection propagates a distance within the sample before reflecting back with the sample's information. This method enables testing of samples that exhibit strong terahertz absorption and cannot be analyzed using conventional transmission or reflection techniques, such as biological samples or cellular proteins.
Parameters of the terahertz attenuation total reflection measurement module
Refractive index of high-resistance silicon | 3.416 |
Sample Chamber Size | 40mm*40mm |
Requirements for the sample's refractive index | < 2.5 |
Incidence angle of the THz beam | 51.6° |
Time-domain peak delay time | ~370ps |
The terahertz attenuation total reflection module is used in terahertz time-domain spectrometers.
Technical Specifications of the Terahertz Attenuated Total Reflection Module
1，Surface accuracy of the total reflection prism polishing surface (scr/dig): 80/50；
2，Total reflection prism angle tolerance: ±30 arc.min；
3、Total contact area between the total reflection beam and the sample:>20mm ；
4、Total reflections: Single；
5、It can be used to test samples such as static aqueous solutions and biological tissue samples that exhibit strong absorption of terahertz waves.