Characteristic research of polaritons in piezoelectric superlattice
Date Issued
2008
Date
2008
Author(s)
Yang, Ming-Yi
Abstract
There have been many researches focused on the periodic structures, inwhich the characteristics of the pass-band and the stop-band are primarily interested. The permittivity modulated structures are well known as the photonic crystals. In the applications of the photonic crystals, there are spontaneous emission suppressing, light manipulating in a specific path, and novel laser creating. In addition, the further thinking about space modulated elastic structures is called phononic crystals. The phononic crystals also have the same characteristics of the frequency band gaps, however, the factors which influence the complete band gap are more complicated than photonic crystals. These factors include the elastic constants, piezoelectric coefficients, density etc.. The governing equations for photonic crystals also are different from the phononic crystals. The physical behaviors in photonic crystals obey the Maxwell’s equations and in phononic crystals it obeys the Newton’s second law of motion. ecently, the piezoelectric-modulated superlattices have been developed. These so called piezoelectric superlattices (PSLs) make the Maxwell’s equations and the Newton’s second law of motion couple to each other. The quantization of the interaction between the electromagnetic waves and the mechanical waves is called the polaritons. This dissertation focuses on the behaviors of the polaritons not only in 1-D PSL but also in the plate form of PSL. From the derived fields and energy distributions of the polaritons, it would have a better understanding in the PSLs.
Subjects
piezoelectric superlattice
polariton
plane wave expansion method
energy distribution
band gap
Type
thesis
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