Tuning of a hypersonic surface phononic band gap using a nanoscale two-dimensional lattice of pillars

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2012
Major/Subject
Mcode
Degree programme
Language
en
Pages
085426/1-6
Series
Physical Review B, Volume 86, Issue 8
Abstract
We present experimental and theoretical evidence of a phononic band gap in a hypersonic range for thermally activated surface acoustic waves in two-dimensional (2D) phononic crystals. Surface Brillouin light scattering experiments were performed on the (001) surface of silicon, loaded with a 2D square lattice of 100- or 150-nm-high aluminum pillars with a spacing of 500nm. The surface Brillouin light scattering spectra revealed a different type of surface mode, related to the modulation of the lattice structure and the mechanical eigenmodes of the pillars. The experimental data were in excellent agreement with theoretical calculations performed using the finite-element method.
Description
Keywords
phononic band gap, two-dimensional lattice of pillars
Other note
Citation
Graczykowski, B. & Mielcarek, S. & Trzaskowska, A. & Sarkar, J. & Hakonen, Pertti J. & Mroz, B. 2012. Tuning of a hypersonic surface phononic band gap using a nanoscale two-dimensional lattice of pillars. Physical Review B. Volume 86, Issue 8. 085426/1-6. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.86.085426