Direct observation of a hypersonic band gap in two-dimensional single crystalline phononic structures
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- Direct observation of a hypersonic band gap in two-dimensional single crystalline phononic structures
- Gorishnyy, Taras; Jang, Ji-Hyun; Koh, CheongYang; Thomas, Edwin L
- ACOUSTIC PHONONS
- Issue Date
- AMER INST PHYSICS
- APPLIED PHYSICS LETTERS, v.91, no.12, pp.1 - 3
- Brillouin light scattering is employed to record the phonon dispersion relation of two-dimensional (2D) hypersonic phononic crystals with square lattice plane group p4mm symmetry. The samples are single crystalline arrays of cylindrical holes with a lattice constant of 750 nm and 35% porosity patterned in epoxy using interference lithography. The dispersion relation reveals the presence of a phononic band gap between 1.21 and 1.57 GHz at the edge of the first Brillouin zone for elastic waves propagating along the  direction and conclusively demonstrates a band gap in a single crystalline 2D polymer based phononic structure at hypersonic frequencies.
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