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Terahertz probe for spectroscopy of sub-wavelength objects.
Oleg Mitrofanov1, Cyril C Renaud, Alwyn J Seeds
1Department of Electronic & Electrical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK. o.mitrofanov@ucl.ac.uk
Optics Express
|March 16, 2012
Summary
A novel terahertz (THz) spectroscopy system uses a twin-needle probe to focus THz pulses onto sub-wavelength objects. This enables detailed analysis of single micrometer-sized materials in the 1-2.5 THz range.
Area of Science:
- Physics
- Materials Science
- Spectroscopy
Background:
- Terahertz (THz) time-domain spectroscopy is a powerful technique for material characterization.
- Analyzing sub-wavelength objects with THz spectroscopy presents significant spatial resolution challenges.
Purpose of the Study:
- To develop a THz spectroscopy system capable of analyzing sub-wavelength objects.
- To achieve spatial confinement of THz pulses for high-resolution spectroscopy.
Main Methods:
- A twin-needle probe design was employed to confine broadband THz pulses.
- Surface plasmon waves were utilized to focus THz pulses to a spot smaller than 10 microns.
- A sub-wavelength aperture probe detected the confined THz pulses in the near-field zone.
Main Results:
- The system successfully confined THz pulses to a sub-wavelength spot.
- Spectroscopic analysis of single micrometer-sized objects was achieved.
- The system operates effectively in the 1-2.5 THz frequency region.
Conclusions:
- The developed twin-needle probe system overcomes spatial limitations in THz spectroscopy.
- This technology enables the characterization of individual micro-scale objects.
- The system opens new avenues for THz applications in micro- and nano-scale material analysis.
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