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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
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Near-Field Photodetection in Direction Tunable Surface Plasmon Polaritons Waveguides Embedded with Graphene
Chia-Hung Wu1, Chih-Jen Ku2, Min-Wen Yu1
1College of Photonics, National Yang Ming Chiao Tung University, 301 Gaofa 3rd Road, Tainan, 71150, Taiwan.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 4, 2023
Summary
Researchers explored plasmonic photodetection using graphene, a 2D material. This method enables efficient light manipulation for compact optoelectronic circuits, achieving high photoresponsivity and polarization-dependent photocurrent.
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Two-dimensional (2D) materials are crucial for developing compact integrated circuits.
- Surface plasmon polaritons (SPPs) offer advanced light manipulation capabilities, overcoming diffraction limits.
- Graphene's unique electronic properties make it a promising material for plasmonic applications.
Purpose of the Study:
- To investigate plasmonic photodetection utilizing graphene as a 2D material.
- To demonstrate non-scattering near-field detection of SPPs.
- To explore the energy conversion mechanisms in a gold-graphene interface for optoelectronic applications.
Main Methods:
- Implementation of non-scattering near-field detection of SPPs using monolayer graphene.
- Stacking graphene under an SPP waveguide with a symmetric antenna.
- Utilizing photovoltaic and photoconductive processes at the gold-graphene interface and biased electrodes for energy conversion.
Main Results:
- Achieved a maximum photoresponsivity of 29.2 mA/W.
- Demonstrated photocurrent modulation based on input light polarization.
- Observed a 400% contrast between maximum and minimum photocurrent signals.
Conclusions:
- Graphene-based plasmonic photodetection is effective for on-chip optoelectronics.
- The developed method offers high sensitivity and polarization control.
- Results are broadly applicable to various on-chip optoelectronic circuit designs.
