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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
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Plasmonic corrugated cylinder-cone terahertz probe
Summary
Researchers studied spoof surface plasmon polaritons (SPPs) in terahertz probes, achieving over 20x electric field enhancement. This tunable effect is promising for advanced microscopy applications.
Area of Science:
- Terahertz (THz) science and technology
- Plasmonics
- Electromagnetism
Background:
- Surface plasmon polaritons (SPPs) enable enhanced light-matter interactions.
- Terahertz near-field microscopy requires efficient field enhancement at the probe tip.
Purpose of the Study:
- To investigate the spoof surface plasmon polariton (SPP) effect on electromagnetic field distribution.
- To explore the potential of corrugated metal cylinder-cone probes for terahertz applications.
Main Methods:
- Finite element computation was used to analyze electromagnetic field distribution.
- Theoretical analysis of dispersion relation for spoof SPP modes was performed.
Main Results:
- Radially polarized terahertz radiation coupled effectively via spoof SPPs, creating a surface wave.
- Over 20x electric field enhancement was observed near the probe tip.
- Multiple resonances due to the antenna effect were analyzed.
Conclusions:
- The probe structure enables significant electric field enhancement through spoof SPPs.
- Resonance frequencies are tunable by modifying probe geometry.
- This technology is attractive for apertureless, background-free terahertz near-field microscopy.
