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We theoretically study the band structures of Lamb waves in one-dimensional phononic crystal plates consisting of piezoelectric ceramics placed periodically in epoxy with epoxy or piezoelectric ceramic substrate by the virtual plane wave expansion method. The dependences of the widths and starting frequencies of first band gaps (FBG) on the substrate's thickness, the filling fraction, and the lattice...
If two or more kinds of elastic materials are arranged periodically in 1D, 2D, or 3D, a phononic crystal is realized. Similar to the electromagnetic wave propagation in a photonic crystal, the phononic crystal also has the property of phononic band gap for the sound or mechanical wave. That is, certain frequency band of sound or mechanical wave cannot pass the phononic crystal. It is believed that...
Frequency up-conversion describes the conversion of low energy incident photons towards higher energy photons via active material. Two-photon absorption is one of the approaches for this strategy which can improve the efficiency in the solar cell. In this report, the molecular structures were designed from the symmetrical grafting of two elongated conjugated linker on a conjugated core and then adding...
We report the absorption and photoluminescence (PL) properties of dilute InPN layers grown by liquid phase epitaxy. All samples were characterized by high resolution X-ray diffraction at room temperature. The band anticrossing model accounts very well for recent experimental results obtained on different samples. Our results indicate that a maximum amount of 0.2% nitrogen has been incorporated in...
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