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Multiple wavelength resonant grating filters at oblique incidence with broad angular acceptance
Optics Express
|June 24, 2009
Summary
Resonant grating filters using multilayer, multimode waveguides offer broadened angular acceptance for multiple wavelengths. Supporting a few leaky modes in the waveguide grating structure is key for multiwavelength filters at oblique incidence.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Resonant grating filters (RGFs) are crucial optical components.
- Achieving broadband angular acceptance for multiple wavelengths simultaneously remains a challenge.
Purpose of the Study:
- To investigate the use of multilayer, multimode waveguides in RGFs.
- To achieve broadened angular acceptance bandwidth for multiple wavelengths at a single oblique angle of incidence.
Main Methods:
- Utilizing multilayer, multimode waveguide structures.
- Analyzing the properties of leaky modes within the waveguide grating.
Main Results:
- Demonstrated that multilayer, multimode waveguides can be employed in RGFs.
- Showed that supporting a few leaky modes is essential for multiwavelength operation.
- Achieved broadened angular acceptance for multiple wavelengths at a single oblique angle.
Conclusions:
- Multilayer, multimode waveguide gratings are effective for multiwavelength resonant filters.
- The number of leaky modes directly influences the filter's angular acceptance bandwidth.
