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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
Narrow band, large angular width resonant reflection from a periodic high index grid at terahertz frequency
Olivier Parriaux1, Thomas Kämpfe, Frédéric Garet
1Université de Lyon, Laboratoire Hubert Curien, UMR CNRS 5516, 18 rue du Professeur Benoît Lauras, 42000 Saint-Etienne, France. olivier.parriaux@univ-st-etienne.fr
Optics Express
|December 25, 2012
Summary
Researchers demonstrated ultra-narrow band terahertz reflection from a silicon membrane with periodic air slits. This silicon grid exhibits near 100% reflection, revealing insights into resonance modes.
Area of Science:
- Physics
- Materials Science
- Electrical Engineering
Background:
- Periodic structures can exhibit unique electromagnetic properties.
- Terahertz (THz) frequency range offers potential for novel applications.
- Thin silicon membranes are versatile materials in microfabrication.
Purpose of the Study:
- To experimentally demonstrate ultra-narrow band high reflection from a silicon membrane with periodic air slits.
- To analyze the nature of resonances supporting this phenomenon.
- To identify resonances responsible for ultra-narrow band reflection.
Main Methods:
- Fabrication of a single-crystal silicon grid using submillimeter microsystem technology.
- Experimental demonstration of reflection properties under normal incidence in the terahertz frequency range.
- Theoretical analysis of true modes supported by the silicon grid.
Main Results:
- Observation of a near 100% ultra-narrow band reflection peak in the terahertz range.
- Experimental validation of the proposed silicon membrane structure's reflective properties.
- Identification of specific resonance modes responsible for the ultra-narrow band reflection.
Conclusions:
- Thin silicon membranes with periodic air slits can achieve ultra-narrow band high reflection in the terahertz range.
- The study provides a fundamental understanding of the resonance mechanisms involved.
- This work paves the way for developing novel terahertz optical components.
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