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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
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Tunable terahertz group slowing effect with plasmon-induced transparency metamaterial
Applied Optics
|April 26, 2022
Summary
We developed a tunable metamaterial that slows down terahertz (THz) waves using plasmon-induced transparency (PIT). This breakthrough enables dynamic control over THz wave group velocity for advanced signal manipulation.
Area of Science:
- Photonics and Metamaterials
- Terahertz (THz) Science and Technology
Background:
- Plasmon-induced transparency (PIT) is a phenomenon that enables the manipulation of light propagation.
- Terahertz (THz) waves offer unique properties for various applications but require precise control mechanisms.
Purpose of the Study:
- To design and demonstrate a tunable plasmon-induced transparency (PIT) metamaterial for controlling terahertz (THz) wave group velocity.
- To investigate the mechanism of PIT in a metamaterial composed of metal split rings and silicon strips.
Main Methods:
- Fabrication of a metamaterial comprising metal split rings and photoconductive silicon strips.
- Excitation and characterization of THz wave transmission through the metamaterial.
- Modulation of silicon conductivity to tune the PIT effect and group velocity.
Main Results:
- A strong PIT effect was observed, leading to significant slowing of THz waves.
- The group delay reached over 20 picoseconds (ps) with a group index of 592.
- Dynamic tunability of the group slowing performance was achieved by altering silicon conductivity.
Conclusions:
- The developed metamaterial effectively manipulates THz wave group velocity via tunable PIT.
- The demonstrated device shows significant potential for applications in THz signal processing and delay lines.
