Nanoscale pillar hypersonic surface phononic crystals

Yudistira, D, Boes, A, Graczykowski, B, Alzina, F, Yeo, L, Sotomayor Torres, C and Mitchell, A 2016, 'Nanoscale pillar hypersonic surface phononic crystals', Physical Review B - Condensed Matter and Materials Physics, vol. 94, no. 9, 094304, pp. 1-6.


Document type: Journal Article
Collection: Journal Articles

Title Nanoscale pillar hypersonic surface phononic crystals
Author(s) Yudistira, D
Boes, A
Graczykowski, B
Alzina, F
Yeo, L
Sotomayor Torres, C
Mitchell, A
Year 2016
Journal name Physical Review B - Condensed Matter and Materials Physics
Volume number 94
Issue number 9
Article Number 094304
Start page 1
End page 6
Total pages 6
Publisher American Physical Society
Abstract We report on nanoscale pillar-based hypersonic phononic crystals in single crystal Z-cut lithium niobate. The phononic crystal is formed by a two-dimensional periodic array of nearly cylindrical nanopillars 240 nm in diameter and 225 nm in height, arranged in a triangular lattice with a 300-nm lattice constant. The nanopillars are fabricated by the recently introduced nanodomain engineering via laser irradiation of patterned chrome followed by wet etching. Numerical simulations and direct measurements using Brillouin light scattering confirm the simultaneous existence of nonradiative complete surface phononic band gaps. The band gaps are found below the sound line at hypersonic frequencies in the range 2-7 GHz, formed from local resonances and Bragg scattering. These hypersonic structures are realized directly in the piezoelectric material lithium niobate enabling phonon manipulation at significantly higher frequencies than previously possible with this platform, opening new opportunities for many applications in plasmonic, optomechanic, microfluidic, and thermal engineering.
Subject Acoustics and Acoustical Devices; Waves
Keyword(s) Acoustic waves
LINB03
DOI - identifier 10.1103/PhysRevB.94.094304
Copyright notice © 2016 American Physical Society.
ISSN 1098-0121
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