Polariton properties of piezoelectric film on the silicon half-space
Date Issued
2008
Date
2008
Author(s)
Pan, Ying-Chih
Abstract
A half-space substrate is covered with a thin layer of piezoelectric superlattice that is polarized oppositely at regular intervals. In this structure phonon and photon will couple together results in quantized behavior of polariton. To study the dispersion curves of polariton in this structure is the goal of this research.n the half-space, the Laplace transform is applied to the coordinate normal to the thin layer. This treatment reduces the number of boundary conditions and decreases the complexity of eigenvalue problems as a consequence. Therefore, it can reduce the computation load significantly and is very helpful in finding dispersion curves. In order to verify the proposed method, dispersion relation for a structure consists of an isotropic layer topped on another isotropic half-space is derived with the aforementioned method. The result is identical with that obtained by an established method. For an anisotropic half-space covered with piezoelectric layer, the electromagnetic and acoustic waves are coupled together. The proposed method can also find its dispersion curves without difficulty. Finally, the method is employed to study the dispersion behavior of polariton in the structure of an anisotropic half-space substrate covered with a thin layer of piezoelectric superlattice. Comparing to the conventional method, the advantage of the proposed method is obvious and higher accuracy is achieved with the same computational load.
Subjects
polariton
film
layer
piezoelectric
half-space
Type
thesis
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