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Low-loss silicon nitride waveguide hybridly integrated with colloidal quantum dots
Optics Express
|May 14, 2015
Summary
We developed novel silicon nitride waveguides with embedded quantum dots, preserving their luminescence and achieving low optical loss. This hybrid approach enables broad-wavelength optical sources.
Area of Science:
- Photonics and Materials Science
- Optoelectronics and Nanotechnology
Background:
- Silicon nitride photonics offers low optical loss but lacks integrated light sources.
- Colloidal quantum dots (CQDs) are efficient light emitters tunable over a broad spectrum.
Purpose of the Study:
- To create a hybrid silicon nitride waveguide platform integrated with CQDs.
- To demonstrate the preservation of CQD luminescence and low propagation loss in the hybrid structure.
Main Methods:
- Fabrication of silicon nitride waveguides using low-temperature deposition.
- Integration of a monolayer of CQDs within the waveguides.
- Optimization of dry etching for composite layers.
- Experimental characterization of luminescence and optical loss.
Main Results:
- Successful fabrication of hybrid waveguides with embedded CQDs.
- Demonstrated preservation of CQD luminescence within the silicon nitride.
- Achieved low waveguide propagation loss of 2.69 dB/cm at 900 nm wavelength.
- Verified broad wavelength tunability potential of CQD emitters.
Conclusions:
- The hybrid integration of silicon nitride photonics and CQDs is feasible.
- This platform preserves active emitter properties and maintains low optical loss.
- Offers a promising pathway for developing novel, broadly tunable on-chip optical sources.
