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Jang, Ji-Hyun
Nano Crystal Lab (NCL)
Research Interests
  • Graphene, photoelectrochemical (PEC) H2 generation, ORR/OER, SERS,3D-Nanostructures, supercapacitors, thermoelectric materials

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Direct observation of a hypersonic band gap in two-dimensional single crystalline phononic structures

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Title
Direct observation of a hypersonic band gap in two-dimensional single crystalline phononic structures
Author
Gorishnyy, TarasJang, Ji-HyunKoh, CheongYangThomas, Edwin L
Keywords
ACOUSTIC PHONONS
Issue Date
2007-09
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.91, no.12, pp.1 - 3
Abstract
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 [10] direction and conclusively demonstrates a band gap in a single crystalline 2D polymer based phononic structure at hypersonic frequencies.
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DOI
10.1063/1.2786605
ISSN
0003-6951
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ECHE_Journal Papers
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