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Monolithic Plasmonic Waveguide Architecture for Passive and Active Optical Circuits.

Charles Chih-Chin Lin1, Po-Han Chang1, Yiwen Su1

  • 1Department of Electrical and Computer Engineering, University of Toronto, Ontario, Canada.

Nano Letters
|April 2, 2020
PubMed
Summary

Researchers developed a novel plasmonic waveguide architecture to overcome the loss-confinement trade-off. This breakthrough enhances plasmonic devices for sensing, quantum, and optical applications.

Keywords:
Purcell factorSchottky photodetectorepsilon-near-zerofield-effect modulatorplasmonics

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Area of Science:

  • Photonics and Nanotechnology
  • Optoelectronics
  • Materials Science

Background:

  • Guided-wave plasmonic circuits are crucial for subdiffraction optical applications.
  • The inherent loss-confinement trade-off limits the efficiency of plasmonic devices.
  • Existing plasmonic and dielectric platforms face performance limitations.

Purpose of the Study:

  • To introduce a unique plasmonic waveguide architecture.
  • To overcome the loss-confinement trade-off in plasmonic circuits.
  • To enhance multiple plasmonic functionalities simultaneously.

Main Methods:

  • Designed and fabricated an amorphous-based, coupled-mode plasmonic structure.
  • Experimental characterization of optical and optoelectronic performance.
  • Demonstration of simultaneous improvements in emission, light-matter interaction, and detection.

Main Results:

  • Achieved a normalized Purcell factor approaching 10^4.
  • Demonstrated 10 dB amplitude modulation with <1 dB insertion loss.
  • Realized fJ-level switching energy and high photodetection sensitivity (-54 dBm) with 6.4% internal quantum efficiency.

Conclusions:

  • The novel architecture effectively alleviates the loss-confinement trade-off.
  • The demonstrated performance surpasses existing plasmonic and dielectric approaches.
  • This work paves the way for reconfigurable, monolithic plasmonic circuits.