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Wide-Stopband Aperiodic Phononic FiltersWe demonstrate that a phonon stopband can be synthesized from an aperiodic structure comprising a discrete set of phononic filter stages. Each element of the set has a dispersion relation that defines a complete bandgap when calculated under a Bloch boundary condition. Hence, the effective stopband width in an aperiodic phononic filter (PnF) may readily exceed that of a phononic crystal with a single lattice constant or a coherence scale. With simulations of multi-moded phononic waveguides, we discuss the effects of finite geometry and mode-converting junctions on the phonon transmission in PnFs. The principles described may be utilized to form a wide stopband in acoustic and surface wave media. Relative to the quantum of thermal conductance for a uniform mesoscopic beam, a PnF with a stopband covering 1.6-10.4 GHz is estimated to reduce the thermal conductance by an order of magnitude at 75 mK.
Document ID
20160007363
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Rostem, Karwan
(Johns Hopkins Univ. Baltimore, MD, United States)
Chuss, David
(Villanova Univ. PA, United States)
Denis, K. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wollack, E. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
June 8, 2016
Publication Date
May 19, 2016
Publication Information
Publication: Journal of Physics D: Applied Physics
Publisher: IOP Publishing
Volume: 49
Issue: 25
ISSN: 022-3727
Subject Category
Solid-State Physics
Optics
Report/Patent Number
GSFC-E-DAA-TN32570
Funding Number(s)
CONTRACT_GRANT: NNX14AB76A
Distribution Limits
Public
Copyright
Other
Keywords
bandgap
mesoscopic beam
phononic crystal

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