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Spatial and spectral beam characteristics in a terahertz broadband sub-wavelength imaging system using a solid
Applied Optics
|June 10, 2024
Summary
This study explores terahertz (THz) imaging using a solid immersion lens (SIL), demonstrating robust sub-wavelength resolution for non-destructive testing. The system tolerates misalignment, enabling detailed subsurface imaging up to 1 mm from the SIL.
Area of Science:
- Optics and Photonics
- Terahertz Spectroscopy
- Imaging Systems
Background:
- Terahertz (THz) time-domain spectroscopy (TDS) enables non-destructive imaging.
- Solid immersion lenses (SILs) can enhance resolution in optical systems.
- Integrating SILs with THz-TDS offers potential for sub-wavelength imaging.
Purpose of the Study:
- To investigate spatial and spectral beam characteristics in a THz broadband sub-wavelength imaging system.
- To determine the misalignment tolerances of the SIL.
- To analyze beam propagation from the SIL for imaging performance.
Main Methods:
- Numerical simulations of beam propagation and SIL misalignment.
- Experimental validation using THz-TDS with an integrated SIL.
- Imaging of stacked utility knife blades with known sub-wavelength structures.
Main Results:
- The system demonstrates robustness, tolerating millimeter-level transverse and longitudinal SIL displacements.
- Sub-wavelength imaging resolution up to 1 mm from the SIL was achieved at 0.5 THz.
- Experimental results validated simulation findings for structures from 0.2 to 2 THz.
Conclusions:
- The THz-TDS system with an SIL is a robust platform for sub-wavelength imaging.
- The system shows potential for non-destructive testing of subsurface structures.
- The findings confirm the feasibility of THz-SIL imaging for detailed structural analysis.
