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陈延峰
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-1年11月30日
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陈延峰
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-1年11月30日
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【期刊论文】Phonon-polaritons in quasiperiodic piezoelectric superlattices
陈延峰, Xue-jin Zhang, Yan-qing Lu, a), Yong-yuan Zhu, b), Yan-feng Chen, and Shi-ning Zhu
Appl. Phys. Lett., Vol. 85, No.16, 18 October 2004,-0001,():
-1年11月30日
Phonon-polaritons are studied both theoretically and experimentally in a one-dimensional two-component generalized quasiperiodic piezoelectric superlattice. The experimental observation of phonon-polaritons through dielectric abnormality is carried out at the microwave region. Some potential applications are discussed.
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陈延峰, Xue-jin Zhang, Ran-qi Zhu, Jun Zhao, Yan-feng Chen, and Yong-yuan Zhu*
PHYSICAL REVIEW B 69, 085118 (2004),-0001,():
-1年11月30日
The phonon-polariton dispersion relation is calculated in the piezoelectric superlattice (PSL). In this specific case, the coupling could take place not only between the electromagnetic (EM) waves (photons) and the transverse superlattice vibrations (transverse phonons), but also between the EM waves and the longitudinal superlattice vibrations (longitudinal phonons), which gives rise to two types of phonon polaritons. It differs with the case in an ionic crystal, where the phonon polariton could only originate from the coupling between transverse lattice vibrations (transverse optical phonons) and EM waves. The two types of phonon polaritons are experimentally observed in the one-dimensional PSL with a periodicity of micrometer scale, corresponding to the frequency region of microwave. The PSL is based on a congruent lithium tantalite (LiTaO3) crystal and fabricated by the method of electric field poling at room temperature. Both microwave absorption and dielectric abnormality are observed and the sizes of band gaps are measured for the two types of phonon polaritons.
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