Probing trace lactose from aqueous solutions by terahertz time-domain spectroscopy.
Lei Hou1, Wei Shi1, Chengang Dong1
1Department of Applied Physics, Xi'an University of Technology, Xi'an 710048, China; Shaanxi Key Laboratory of Ultrafast Photoelectronic Technology and Terahertz Science, Xi'an University of Technology, Xi'an 710048, China.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|October 17, 2020
Summary
This study introduces a novel method using a horn-shaped waveguide to enhance terahertz (THz) wave detection of hydrated substances. The technique achieves high sensitivity for detecting trace amounts of biological materials.
Area of Science:
- Biophysics
- Spectroscopy
- Materials Science
Background:
- Terahertz (THz) waves offer unique advantages for biological substance detection.
- Strong water absorption of THz waves limits current detection technologies for hydrated materials.
- Existing methods for detecting hydrated materials have significant drawbacks and limited applicability.
Purpose of the Study:
- To propose a convenient and effective method for detecting terahertz spectra of hydrated substances.
- To overcome the limitations of current THz detection methods in biological applications.
- To enhance the sensitivity and applicability of THz spectroscopy for biological samples.
Main Methods:
- Design of a horn-shaped tapered parallel plate waveguide to concentrate THz waves.
- Integration of the waveguide into a THz time-domain spectroscopy system.
- Demonstration using α-lactose dilute solution for spectral analysis.
Main Results:
- The designed waveguide successfully enhances the electrical field of THz waves.
- THz spectral information of hydrated substances was obtained in the 0.1–1.5 THz range.
- Sensitivity achieved was on the order of femtomoles for α-lactose detection.
Conclusions:
- The proposed method provides a promising approach for THz spectral detection of hydrated substances.
- This technique has potential for in situ detection of trace hydrated substances, cells, and biomolecules.
- The enhanced sensitivity and convenience offer new possibilities in biophysical and biomedical THz applications.
