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Transverse magnetic defect modes in two-dimensional triangular-lattice photonic crystals
1Department of Physics and Astronomy, State University of New York at Stony Brook, 11794-3381, USA. nstojic@grad.physics.sunysb.edu
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 12, 2001
Summary
We studied localized transverse magnetic (TM) defect modes in 2D photonic crystals. Results show these TM modes are highly localized at the defect, offering potential for novel optical devices.
Area of Science:
- Physics
- Materials Science
- Optics
Background:
- Photonic crystals offer unique light manipulation properties.
- Defect modes in photonic crystals are crucial for optical device applications.
- Understanding localized modes is key to designing advanced photonic structures.
Purpose of the Study:
- To numerically investigate localized transverse magnetic (TM) defect modes.
- To analyze the spatial symmetry and resonant frequency tuning of these modes.
- To explore the potential of these modes in two-dimensional photonic lattices.
Main Methods:
- Numerical simulation using a parallelized finite-difference time-domain (FDTD) method.
- Validation against experimental and alternative numerical results for transverse electric (TE) modes.
- Systematic variation of dipole excitation frequency and defect-cylinder radius.
Main Results:
- TM defect modes exhibit high localization at the defect site within the photonic lattice.
- Spatial symmetry of TM modes was analyzed by varying excitation frequency.
- Resonant frequencies were tuned across the band gap by adjusting the defect-cylinder radius.
Conclusions:
- The study confirms strong localization of TM defect modes in 2D photonic crystals.
- The findings provide insights into controlling light at the defect.
- This work supports the development of novel photonic devices utilizing localized defect modes.