28 April 2011 Electromagnetic radiation of polaritons in piezoelectric superlattices
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There are five kinds of plane waves in a general piezoelectric solid, three of them are quasi-acoustic waves and the other two are quasi-electromagnetic waves. When these plane waves propagate from interior of a half space to the solidvacuum interface, electromagnetic waves in vacuum are induced. For the same input power, the power of EM waves in the free space induced by quasi-acoustic waves is much smaller than that induced by quasi-electromagnetic waves. That is, the EM waves are hardly to be generated mechanically in piezoelectric materials. Piezoelectric superlattice formed by intervallic polarizing oppositely along one direction can have significant coupling between phonon and photon in the vicinity of the first Brillouin zone center. Since the acoustic energy and electromagnetic energy of polaritons in the piezoelectric superlattice can be very close, the free space EM waves excited by polaritons can be expected. LiNbO3 is adopted as an example. Once LiNbO3 is polarized intervallic oppositely, the power ratio increases significantly. The free space electromagnetic field coupled with polaritons can extend very far from the solid -vacuum interface.
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Yuan-Fang Chou, Yuan-Fang Chou, Chih-Hua Shih, Chih-Hua Shih, } "Electromagnetic radiation of polaritons in piezoelectric superlattices", Proc. SPIE 7978, Behavior and Mechanics of Multifunctional Materials and Composites 2011, 797820 (28 April 2011); doi: 10.1117/12.882032; https://doi.org/10.1117/12.882032

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