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Published on: February 25, 2017
Photonic crystal surface modes narrow-band filtering
Optics Express
|June 6, 2009
Summary
Researchers demonstrate resonant excitation of surface-guided modes in two-dimensional photonic crystals. This method achieves 100% narrow-band light transmission through forbidden band gaps.
Area of Science:
- Photonics
- Condensed Matter Physics
- Materials Science
Background:
- Two-dimensional photonic crystals exhibit forbidden band gaps, preventing light transmission.
- Surface-guided modes can propagate within these forbidden gaps under specific conditions.
Purpose of the Study:
- To achieve efficient light transmission through the forbidden gaps of photonic crystals.
- To explore the resonant excitation of surface-guided modes for narrow-band transmission.
Main Methods:
- Utilizing a specific surface cut of a two-dimensional photonic crystal slab.
- Employing diffraction gratings for resonant excitation of surface-guided modes.
- Operating near normal incidence to leverage mode dispersion characteristics.
Main Results:
- Introduced defects in the photonic band gap via resonant excitation.
- Achieved narrow-band light transmission with a maximum of 100%.
- Demonstrated preserved spectral selectivity with reduced beam parallelism requirements.
Conclusions:
- Resonant excitation of surface-guided modes offers a highly efficient method for light transmission through photonic crystal band gaps.
- The technique enables precise control over spectral transmission properties.
- This approach has potential applications in optical filtering and signal processing.
