Abstract
Motivated by the promising impacts in acoustic devices and applications that can efficiently trap, guide, and manipulate sonic waves, researches of Photonic Crystals (PCs) have received great attention in the past decade. Many anomalous refractive and diffractive effects, such as superprism effects and negative refraction, have been found in such PCs. In this report, by studying the wave packet superposed by Bloch modes in the isofrequency surface at unique points of the PC band structure, the negative diffraction effect in certain directions of the PCs is exploited to realize X-shaped wave localization settled in one point, which cannot exist at rest in homogeneous media.
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