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Extracting Complex Refractive Index from Polycrystalline Glucose with Self-Referenced Method for Terahertz
Yu Zhang1, Lin Zhang1, Ping Sun2
1Beijing Area Major Laboratory of Applied Optics, Department of Physics, Beijing Normal University, China.
Applied Spectroscopy
|July 15, 2016
Summary
A new self-referenced method accurately determines material
Area of Science:
- Terahertz spectroscopy
- Materials science
- Optical properties
Background:
- Accurate determination of complex refractive index is crucial for material characterization.
- Traditional methods can be complex and require separate reference measurements.
- Terahertz (THz) spectroscopy offers unique insights into material properties.
Purpose of the Study:
- To propose and validate a self-referenced method for extracting the complex refractive index.
- To apply this method to crystalline glucose using time-domain THz reflection spectroscopy.
- To investigate the origin of absorption peaks in the THz spectrum.
Main Methods:
- Developed a self-referenced technique using front and rear surface reflections as signals.
- Employed a hybrid filtering method to remove noise from THz reflection spectroscopy data.
- Measured the THz reflection spectrum of crystalline glucose from 0.2 to 2.0 THz.
Main Results:
- Successfully extracted the complex refractive index of crystalline glucose.
- Identified three distinct absorption peaks in the measured THz spectrum.
- The self-referenced approach simplified the measurement process.
Conclusions:
- The proposed self-referenced method is effective for determining complex refractive index.
- Observed THz absorption peaks in crystalline glucose suggest contributions from intermolecular vibrational modes.
- This technique advances THz spectroscopy applications in material analysis.
