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Polarization independent integrated filter based on a cross-slot waveguide
Optics Express
|October 17, 2014
Summary
We developed a novel optical filter using a cross-slot waveguide and Bragg grating. This polarization-dependent or independent device offers strong light confinement for sensing applications.
Area of Science:
- Photonics
- Optical Engineering
- Nanotechnology
Background:
- Integrated optical filters are crucial for WDM systems.
- Polarization-dependent devices limit applications.
- Miniaturization is key for advanced sensing.
Purpose of the Study:
- To design and analyze an in-line band-pass optical filter.
- To achieve polarization-independent or dependent operation.
- To explore its potential for sensing applications.
Main Methods:
- Utilized a cross-slot waveguide merged with a Bragg grating and optical cavities (C₂- and C₄-symmetric).
- Employed Fourier Modal Method and Finite Difference Time Domain (FDTD) for numerical simulations.
- Investigated the impact of silicon nanowire inclusion in the cavity.
Main Results:
- Demonstrated strong light confinement in a small volume.
- Achieved tunable polarization dependence through cavity design.
- Observed enhanced guiding and resonance amplitude with silicon nanowire integration.
- Validated filter performance for both TE and TM polarizations.
Conclusions:
- The proposed filter design offers efficient light confinement for sensing.
- Cavity engineering allows control over polarization behavior.
- Silicon nanowire integration boosts device performance.
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