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Broadband sharp 90-degree bends and T-splitters in plasmonic coaxial waveguides
Wonseok Shin1, Wenshan Cai, Peter B Catrysse
1E. L. Ginzton Laboratory, Stanford University , Stanford, California 94305, United States.
Nano Letters
|August 29, 2013
Summary
Sharp 90° bends and T-splitters in plasmonic coaxial waveguides enable reflectionless operation at deep-subwavelength scales. These designs are crucial for developing compact, densely integrated optical circuits with reduced crosstalk.
Area of Science:
- Photonics
- Optical Engineering
- Nanotechnology
Background:
- Plasmonic waveguides offer subwavelength light confinement.
- Designing efficient waveguide components like bends and splitters at the nanoscale is challenging.
- Reflection and radiation losses limit the integration density of optical circuits.
Purpose of the Study:
- To numerically demonstrate the design of reflectionless sharp 90° bends and T-splitters in plasmonic coaxial waveguides.
- To achieve operation at deep-subwavelength scales and over a broad wavelength range, including 1.55 μm.
- To provide a theoretical explanation for the operational principles.
Main Methods:
- Numerical simulations of plasmonic coaxial waveguides.
- Design and analysis of waveguide bends and T-splitters.
- Application of a transmission line model in the quasi-static limit.
Main Results:
- Successful design of sharp 90° bends and T-splitters with no reflection or radiation.
- Demonstrated operation at deep-subwavelength scales.
- Validated performance over a broad wavelength range, including telecommunication wavelengths (1.55 μm).
Conclusions:
- Compact, reflectionless plasmonic waveguide components are achievable.
- The transmission line model provides insight into the operating principles.
- These components pave the way for densely integrated optical circuits with minimal crosstalk.
