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Double inverse nanotapers for efficient light coupling to integrated photonic devices
Optics Letters
|July 14, 2018
Summary
Novel double inverse tapers improve light coupling efficiency in silicon nitride photonic devices. These tapers offer polarization-independent coupling for near-infrared and visible light applications.
Area of Science:
- Photonics
- Nanotechnology
- Materials Science
Background:
- Efficient light coupling is crucial for integrated photonic devices.
- Current inverse nanotapers require sub-100 nm widths for mode matching.
Purpose of the Study:
- To introduce and demonstrate novel "double inverse" tapers for enhanced light coupling.
- To achieve high coupling efficiency independent of polarization.
Main Methods:
- Fabrication of silicon nitride (Si3N4) double inverse tapers.
- Characterization of chip-through coupling efficiency for transverse electric (TE) and transverse magnetic (TM) polarizations.
Main Results:
- Achieved >45% chip-through coupling efficiency for both TE and TM polarizations.
- Demonstrated efficient coupling with tapers wider than 500 nm.
- Observed polarization-independent coupling characteristics.
Conclusions:
- Double inverse tapers offer a significant improvement over traditional inverse tapers.
- The developed tapers are compatible with photolithography, enabling scalable fabrication.
- These tapers are suitable for applications like supercontinuum and soliton microcomb generation at near-infrared and visible wavelengths.
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