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Updated: Feb 14, 2026
10:54
Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
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Anti-reflection coating design for metallic terahertz meta-materials
Optics Express
|February 7, 2018
Summary
We developed a silicon anti-reflection coating that allows optical probing of nanoscale structures near metals. This coating preserves terahertz near-field enhancement for advanced ultrafast studies.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Highly reflective metallic surfaces impede optical probing of embedded nanoscale structures.
- Terahertz (THz) radiation offers unique capabilities for nano-scale manipulation and sensing.
- Existing methods often struggle to balance optical transparency with THz field enhancement.
Purpose of the Study:
- To develop a single-layer anti-reflection coating for metals at near-infrared (NIR) frequencies.
- To enable optical probing of nano-scale structures within highly reflective environments.
- To ensure the coating does not interfere with THz near-field enhancement.
Main Methods:
- Fabrication and characterization of a silicon/gold double layer to measure reflectivity across IR and THz spectra.
- Design and simulation of a THz meta-material (dipole antenna) using time-domain finite element method.
- Magneto-optical Kerr effect (MOKE) measurements on a nano-magnetic wire within the THz antenna.
Main Results:
- Demonstrated a silicon-based anti-reflection coating suppressing NIR reflectivity from metals.
- Verified preservation of THz near-field enhancement in the presence of the coating.
- Successfully detected magneto-optical response from a 3-nm thick magnetic wire using optical probing.
Conclusions:
- The developed anti-reflection coating enables optical probing of nano-structures in reflective environments.
- The coating is compatible with THz near-field enhancement applications.
- This work facilitates ultrafast time-resolved studies of nano-dynamics driven by THz radiation.
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