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A narrow-band subwavelength plasmonic waveguide filter with asymmetrical multiple-teeth-shaped structure
Jin Tao1, Xu Guang Huang, Xianshi Lin
1Laboratory of Photonic Information Technology, South China Normal University, Guangzhou 510006, China.
Optics Express
|August 6, 2009
Summary
An asymmetrical multiple-teeth plasmonic filter was developed. This novel structure functions as a narrow-passband filter, with its central wavelength tunable by adjusting specific structural parameters.
Area of Science:
- Plasmonics
- Optical filters
- Nanophotonics
Background:
- Plasmonic nanostructures offer unique optical properties.
- Multiple-teeth-shaped structures have been explored for filtering applications.
- Limitations exist in controlling the passband characteristics of existing designs.
Purpose of the Study:
- To analyze the characteristics of a multiple-teeth-shaped plasmonic filter.
- To propose and simulate an extended asymmetrical multiple-teeth-shaped structure.
- To investigate the filter's ability to achieve narrow-passband functionality.
Main Methods:
- Numerical simulation using the finite difference time domain (FDTD) method.
- Implementation of a perfectly matched layer (PML) absorbing boundary condition.
- Analysis of structural parameter variations on optical response.
Main Results:
- The asymmetrical structure successfully functions as a narrow-passband filter.
- The central wavelength of the passband exhibits a linear dependence on parameters d(1) and d(2).
- Simulations confirm the tunability of the filter's central wavelength.
Conclusions:
- The proposed asymmetrical multiple-teeth plasmonic structure is an effective narrow-passband filter.
- Simultaneous increase in d(1) and d(2) provides a linear control over the central passband wavelength.
- This design offers potential for tunable optical filtering applications.
