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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
Published on: August 30, 2012
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Efficient directional coupling from multilayer-graphene-based long-range SPP waveguide to metal-based hybrid SPP
Optics Express
|November 25, 2018
Summary
We developed a novel directional coupler for optical integrated circuits. This device efficiently transfers energy between graphene and metal waveguides, showing promise for future photonic applications.
Area of Science:
- Photonics and Nanotechnology
- Optoelectronics
- Materials Science
Background:
- Surface plasmon polariton (SPP) waveguides are crucial for electromagnetic wave propagation in optical integrated systems.
- Both graphene-based and metal-based SPP waveguides are actively researched for their unique properties.
Purpose of the Study:
- To propose and analyze a directional coupler for efficient energy transfer between graphene and metal SPP waveguides.
- To operate in the mid-infrared range for optical integrated circuits.
Main Methods:
- Design of a directional coupler coupling energy from a multilayer-graphene-based cylindrical long-range SPP waveguide to a metal-based cylindrical hybrid SPP waveguide.
- Analysis of coupling length, efficiency, insertion loss, and extinction ratio by adjusting wave vector mismatch.
- Investigation of fabrication tolerance and operational range of Fermi energy and graphene mobility.
Main Results:
- Achieved low coupling length, high coupling efficiency, low insertion loss, and high extinction ratio.
- Demonstrated tolerance to fabrication errors such as misalignment of graphene layers.
- Confirmed effective operation for Fermi energy (Ef) > 0.6 eV with varying graphene mobility (10000 to 800 cm²/Vs).
Conclusions:
- The proposed directional coupler enables efficient signal routing and information exchange between dissimilar SPP waveguides.
- This technology holds potential for advanced photonic integrated circuits.
- The coupler's robustness to fabrication imperfections enhances its practical applicability.
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