Negative refraction and energy funneling by hyperbolic materials: An experimental demonstration in acoustics

Victor M. García-Chocano, Johan Christensen, José Sánchez-Dehesa

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Abstract

This Letter reports the design, fabrication, and experimental characterization of hyperbolic materials showing negative refraction and energy funneling of airborne sound. Negative refraction is demonstrated using a stack of five holey Plexiglas plates where their thicknesses, layer separation, hole diameters, and lattice periodicity have been determined to show hyperbolic dispersion around 40 kHz. The resulting hyperbolic material shows a flat band profile in the equifrequency contour allowing the gathering of acoustic energy in a broad range of incident angles and its funneling through the material. Our demonstrations foresee interesting developments based on both phenomena. Acoustic imaging with subwavelength resolution and spot-size converters that harvest and squeeze sound waves irradiating from many directions into a collimated beam are just two possible applications among many.
Original languageEnglish
Article number144301
JournalPhysical Review Letters
Volume112
Issue number14
Number of pages5
ISSN0031-9007
DOIs
Publication statusPublished - 2014

Cite this

García-Chocano, Victor M. ; Christensen, Johan ; Sánchez-Dehesa, José. / Negative refraction and energy funneling by hyperbolic materials: An experimental demonstration in acoustics. In: Physical Review Letters. 2014 ; Vol. 112, No. 14.
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Negative refraction and energy funneling by hyperbolic materials: An experimental demonstration in acoustics. / García-Chocano, Victor M.; Christensen, Johan; Sánchez-Dehesa, José.

In: Physical Review Letters, Vol. 112, No. 14, 144301, 2014.

Research output: Contribution to journalJournal articleResearchpeer-review

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