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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
14.8K
Active metal-graphene hybrid terahertz surface plasmon polaritons
Mingming Feng1, Baoqing Zhang1, Haotian Ling1
1Shandong Technology Center of Nanodevices and Integration, School of Microelectronics, Shandong University, Jinan, Shandong, China.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
This study introduces a novel metal-graphene device for active terahertz (THz) surface plasmon polaritons (SPPs) modulation. The device demonstrates significant phase modulation and transmittance changes by tuning graphene
Area of Science:
- Terahertz (THz) photonics
- Plasmonics
- Graphene-based devices
Background:
- Surface plasmon polaritons (SPPs) are electromagnetic waves confined to surfaces.
- Designer SPPs mimic optical SPPs at THz frequencies using patterned metals.
- Active modulation of THz SPPs is crucial for advanced photonic applications.
Purpose of the Study:
- To develop a novel active metal-graphene hybrid device for THz SPP modulation.
- To investigate the phase modulation capabilities of graphene-based SPP structures.
- To explore graphene's potential for active control of THz wave propagation.
Main Methods:
- Theoretical modeling of THz SPP dispersion curves.
- Fabrication of a metal-graphene hybrid SPP device.
- Experimental characterization of the device under varying graphene bias.
- Measurement of cut-off frequency shift and phase modulation.
Main Results:
- Achieved significant phase modulation up to 112° at 195 GHz.
- Demonstrated red shift of cut-off frequency from 200 to 177 GHz.
- Observed SPP transmittance modulation by over 3 dB due to graphene absorption.
Conclusions:
- The metal-graphene hybrid structure enables active modulation of THz SPPs.
- Graphene's tunable properties offer a new pathway for controlling SPP characteristics.
- This approach opens possibilities for nonreciprocal and topological THz SPP studies.
