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Gap modes of one-dimensional photonic crystal surface waves
1Applied Optics Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia. pile@opt.tokushima-u.ac.jp
Applied Optics
|July 28, 2005
Summary
Researchers analyzed coupled surface modes in photonic crystals using the finite-difference time-domain method. They found gap mode behavior opposite to surface plasmons, suggesting potential for nondissipating waveguides.
Area of Science:
- Photonics
- Condensed Matter Physics
- Electromagnetism
Background:
- Surface modes on periodic structures are crucial for optical device applications.
- Understanding mode coupling in finite photonic crystals is essential for designing novel optical components.
Purpose of the Study:
- To analyze the coupling of surface modes in two truncated one-dimensional photonic crystals separated by a gap.
- To investigate the wave vector, field distributions, and existence conditions of these coupled surface modes.
Main Methods:
- Finite-difference time-domain (FDTD) method was employed for numerical simulation.
- Analysis focused on the behavior of symmetric and antisymmetric gap modes.
Main Results:
- The wave vector of symmetric gap modes increases as the gap width decreases.
- The wave vector of antisymmetric gap modes decreases with decreasing gap width.
- This behavior is opposite to that observed for surface plasmons in metallic systems.
Conclusions:
- Photonic crystal gap modes exhibit unique properties distinct from surface plasmons.
- These nondissipating gap modes offer potential for effective use as waveguides.