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Coupled metal gap waveguides as plasmonic wavelength sorters
1Key Laboratory of Acoustic and Photonic Materials and Devices, Ministry of Education and Department of Physics, Wuhan University, Wuhan 430072, China.
Optics Express
|June 12, 2008
Summary
We developed a coupled metal gap waveguide for plasmonic wavelength sorting. This structure routes different wavelengths to distinct output ports, enabling nanoscale optical communication devices.
Area of Science:
- Photonics and Nanotechnology
- Plasmonics
Background:
- Surface plasmon polaritons (SPPs) are light-matter interactions at metal-dielectric interfaces.
- Efficient manipulation of SPPs is crucial for nanoscale photonic devices.
Purpose of the Study:
- To propose and analyze a coupled metal gap waveguide structure for plasmonic wavelength sorting.
- To demonstrate the feasibility of routing different wavelengths to distinct output ports.
Main Methods:
- Theoretical analysis using coupled-wave theory.
- Numerical simulations using the finite-difference time-domain (FDTD) method.
Main Results:
- Wavelength-dependent coupling length of SPPs enables wavelength routing.
- Achieved reasonable high extinction ratios for wavelength separation.
- Analytical predictions were validated by FDTD simulations.
Conclusions:
- The coupled metal gap waveguide is a viable structure for plasmonic wavelength sorters.
- This approach offers a new method for constructing nanoscale frequency multiplexers and routers.
- Potential applications in nanophotonic integration and optical communication.
