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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Diamond diffractive lens with a continuous profile for powerful terahertz radiation.
Optics Letters
|January 15, 2021
Summary
New diamond lenses fabricated using laser-assisted replication offer high performance for powerful terahertz (THz) sources. This advanced optics technology achieves 95% diffraction efficiency for THz radiation.
Area of Science:
- Optics and Photonics
- Materials Science
- Terahertz Technology
Background:
- Increasing power of terahertz (THz) sources necessitates advanced optical components.
- Existing optics may not withstand high-intensity THz radiation.
Purpose of the Study:
- To develop a novel fabrication method for continuous-profile diamond cylindrical diffractive lenses for the THz range.
- To evaluate the performance of these fabricated lenses.
Main Methods:
- Laser-assisted replication technique.
- Inverted structuring of silicon substrate via laser ablation.
- Replication onto diamond surface using chemical vapor deposition (CVD).
- Testing with a free-electron laser at 141 µm wavelength.
Main Results:
- Successfully fabricated a diamond cylindrical diffractive lens with a continuous profile.
- Achieved high diffraction efficiency of 95±5%.
- Observed good agreement between measured and expected intensity distribution.
Conclusions:
- Laser-assisted replication is a viable method for producing high-performance THz optics from diamond.
- The fabricated lenses are suitable for high-power THz applications.
- Continuous-profile diffractive lenses show excellent efficiency in the THz spectrum.
