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Photonic-plasmonic mode coupling in nanopillar Ge-on-Si PIN photodiodes
Lion Augel1,2, Jon Schlipf3, Sergej Bullert4
1Micro and Nano Systems, Brandenburg University of Technology Cottbus-Senftenberg, 03046, Cottbus, Germany. lion.augel@b-tu.de.
Scientific Reports
|March 12, 2021
Summary
We explored plasmonic nanoapertures and germanium-on-silicon nanopillar photodetectors. Plasmonic resonances tune light coupling into photodetectors for sensing and spectroscopy applications.
Area of Science:
- Photonics
- Optoelectronics
- Nanotechnology
Background:
- Top-illuminated photonic devices require transmissive contact schemes for group IV nanostructures.
- Plasmonic nanoapertures offer CMOS-compatible solutions and can modulate device responsivity.
Purpose of the Study:
- To investigate crescent-shaped plasmonic nanoapertures near germanium-on-silicon (Ge-on-Si) PIN nanopillar photodetectors.
- To understand how plasmonic resonances influence light coupling into nanopillar leaky waveguide modes.
Main Methods:
- Utilized both computational simulations and experimental fabrication.
- Investigated the interaction between crescent-shaped nanoapertures and Ge-on-Si PIN nanopillar photodetectors.
Main Results:
- Device absorption is primarily governed by the nanopillar's leaky waveguide modes.
- Plasmonic resonances effectively control light coupling into these leaky modes.
Conclusions:
- Plasmonic nanoapertures can selectively tune photodetector geometries.
- This approach is promising for applications in spectroscopy and refractive index sensing.
