Journal ArticleDOI
Experimental evidence for the existence of absolute acoustic band gaps in two-dimensional periodic composite media
Jérôme Olivier Vasseur,Pierre A. Deymier,George N. Frantziskonis,G Hong,Bahram Djafari-Rouhani,Leonard Dobrzynski +5 more
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In this article, the experimental transmission spectrum and theoretical band structure of two periodic arrays of cylinders organized on a square lattice and on a centred rectangular network are reported, and the measured transmission is observed to drop to noise level throughout frequency intervals in reasonable agreement with the calculated forbidden frequency bands.Abstract:
Transmission of acoustic waves in two-dimensional binary solid/solid composite media composed of arrays of Duralumin cylindrical inclusions embedded in an epoxy resin matrix is studied. The experimental transmission spectrum and theoretical band structure of two periodic arrays of cylinders organized on a square lattice and on a centred rectangular network are reported. Absolute gaps extending throughout the first two-dimensional Brillouin zone are predicted. The measured transmission is observed to drop to noise level throughout frequency intervals in reasonable agreement with the calculated forbidden frequency bands.read more
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Systematic design of phononic band-gap materials and structures by topology optimization.
TL;DR: In this article, the authors show how topology optimization can be used to design and optimize periodic materials and structures exhibiting phononic band gaps, which can prevent elastic waves in certain frequency ranges from propagating.
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Two-dimensional phononic crystals: Examples and applications
Yan Pennec,Jérôme Olivier Vasseur,Bahram Djafari-Rouhani,Leonard Dobrzynski,Pierre A. Deymier +4 more
TL;DR: In this article, the authors present some examples of two-dimensional bulk phononic crystals (i.e., arrays of inclusions assumed of infinite extent along the three spatial directions) and show that the bandwidth of the forbidden band depends strongly on the nature of the constituent materials (solid or fluid), as well as the contrast between the physical characteristics (density and elastic moduli) of the inclusions and of the matrix, the geometry of the array of inclusion, the inclusion shape and the filling factor.
Journal ArticleDOI
Phononic band gaps and vibrations in one- and two-dimensional mass-spring structures
TL;DR: In this paper, the vibrational response of finite periodic lattice structures subjected to periodic loading is investigated, and the effects of boundaries, viscous damping, and imperfections are studied by analyzing two examples; a 1-D filter and a 2-D wave guide.
Journal ArticleDOI
Tunable filtering and demultiplexing in phononic crystals with hollow cylinders.
TL;DR: It is shown that a waveguide constituted of a row of hollow cylinders with different inner radii can transport waves at two different frequencies, and is created an active device that permits the transmission of waves at one, both, or neither of these frequencies.
Journal ArticleDOI
Enhancement of light extraction from light emitting diodes
TL;DR: In this paper, the authors reviewed approaches to enhanced light extraction grouped into two sets depending on whether their application results in the change in the spontaneous emission rate or the angular distribution, or both.
References
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Journal ArticleDOI
Inhibited Spontaneous Emission in Solid-State Physics and Electronics
TL;DR: If a three-dimensionally periodic dielectric structure has an electromagnetic band gap which overlaps the electronic band edge, then spontaneous emission can be rigorously forbidden.
Journal ArticleDOI
Acoustic band structure of periodic elastic composites.
Manvir S. Kushwaha,Manvir S. Kushwaha,Manvir S. Kushwaha,Peter Halevi,Peter Halevi,Peter Halevi,Leonard Dobrzynski,Leonard Dobrzynski,Leonard Dobrzynski,Bahram Djafari-Rouhani,Bahram Djafari-Rouhani,Bahram Djafari-Rouhani +11 more
TL;DR: This work presents the first cull band-structure calculations for periodic, elastic composites and obtains a «phononic» band gap which extends throughout the Brillouin zone.
Book
Wave Propagation in Periodic Structures
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Journal ArticleDOI
Band structure of elastic waves in two dimensional systems
TL;DR: In this paper, the band structure of acoustic and elastic waves propagating in two dimensional periodic fluid or solid systems is calculated, and the authors show that gaps are obtained easily, in contrast to the case of solids, where a large density mismatch is required.
Journal ArticleDOI
Theory of acoustic band structure of periodic elastic composites.
TL;DR: The band structures for the transverse modes of nickel alloy cylinders in an aluminum alloy host, and vice versa are computed, finding band gaps which extend throughout the Brillouin zone.