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Propagation and localization of electromagnetic waves in quasiperiodic serial loop structures.
H Aynaou1, E H El Boudouti, Y El Hassouani
1Laboratoire de Dynamique et d'Optique des Matériaux, Département de Physique, Faculté des Sciences, Université Mohamed Premier, 60000 Oujda, Morocco.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 31, 2005
Summary
This study explores electromagnetic wave propagation in quasiperiodic photonic band gap structures. Researchers found unique localized modes and unusual dispersion, enabling fast or slow light, with experimental validation.
Area of Science:
- Condensed Matter Physics
- Photonics
- Materials Science
Background:
- Photonic band gap structures are crucial for controlling light propagation.
- Quasiperiodic structures offer unique optical properties compared to periodic ones.
- Understanding wave propagation in these complex systems is essential for advanced optical devices.
Purpose of the Study:
- To investigate electromagnetic wave propagation in 1D quasiperiodic photonic band gap structures.
- To analyze the impact of symmetric and asymmetric loop structures on wave transmission.
- To compare the behavior of Fibonacci structures with other quasiperiodic systems.
Main Methods:
- Numerical simulations of electromagnetic wave propagation.
- Analysis of transmission spectra, phase time, group velocity, and density of states.
- Investigation of symmetric and asymmetric loop configurations within quasiperiodic lattices.
Main Results:
- Symmetric loop structures behave as impedance-modulated mediums, exhibiting extended, forbidden, and defect modes.
- Asymmetric loop structures act as resonators, introducing additional transmission zeros and gaps.
- Unusual dispersion in stop bands leads to group velocities exceeding the speed of light in some cases.
- Fibonacci structures show distinct localized modes within band gaps compared to other quasiperiodic systems.
Conclusions:
- Quasiperiodic photonic band gap structures with loop elements offer tunable control over light propagation.
- The design of loop structures (symmetric vs. asymmetric) significantly influences transmission characteristics and band gap properties.
- Observed phenomena like fast/slow light and defect modes hold potential for novel photonic applications.