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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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Low-bias terahertz amplitude modulator based on split-ring resonators and graphene
Riccardo Degl'Innocenti1, David S Jessop, Yash D Shah
1Cavendish Laboratory, University of Cambridge , J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
ACS Nano
|February 25, 2014
Summary
Researchers developed a novel device combining split-ring resonators and graphene for optical control of terahertz (THz) light. This design enables active modulation of light intensity by tuning graphene
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Optical control of light at terahertz (THz) frequencies is crucial for advanced applications.
- Split-ring resonators (SRRs) are subwavelength metamaterial elements offering tunable resonances.
- Graphene's tunable electronic properties present opportunities for active optical devices.
Purpose of the Study:
- To design and demonstrate a hybrid metamaterial device for active optical modulation at THz frequencies.
- To investigate the interplay between metallic split-ring resonators and monolayer graphene.
- To achieve efficient optical intensity modulation by tuning graphene's carrier concentration.
Main Methods:
- Fabrication of a device integrating metallic split-ring resonators with monolayer graphene.
- Lithographic tuning of SRR resonances.
- Electrical modulation of graphene's carrier concentration via applied bias.
Main Results:
- Achieved active modulation of optical intensity in the 2.2–3.1 THz frequency range.
- Demonstrated a maximum modulation depth of 18%.
- Observed efficient modulation with a low bias voltage of 0.5 V.
Conclusions:
- The hybrid SRR-graphene device offers an effective route for optical control of THz light.
- Graphene's electronic tunability is key to achieving active modulation in this frequency range.
- This technology holds promise for THz modulators and other optoelectronic applications.
