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2017 ; 8
(ä): 14608
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Metamaterial bricks and quantization of meta-surfaces
#MMPMID28240283
Memoli G
; Caleap M
; Asakawa M
; Sahoo DR
; Drinkwater BW
; Subramanian S
Nat Commun
2017[Feb]; 8
(ä): 14608
PMID28240283
show ga
Controlling acoustic fields is crucial in diverse applications such as
loudspeaker design, ultrasound imaging and therapy or acoustic particle
manipulation. The current approaches use fixed lenses or expensive phased arrays.
Here, using a process of analogue-to-digital conversion and wavelet
decomposition, we develop the notion of quantal meta-surfaces. The quanta here
are small, pre-manufactured three-dimensional units-which we call metamaterial
bricks-each encoding a specific phase delay. These bricks can be assembled into
meta-surfaces to generate any diffraction-limited acoustic field. We apply this
methodology to show experimental examples of acoustic focusing, steering and,
after stacking single meta-surfaces into layers, the more complex field of an
acoustic tractor beam. We demonstrate experimentally single-sided air-borne
acoustic levitation using meta-layers at various bit-rates: from a 4-bit uniform
to 3-bit non-uniform quantization in phase. This powerful methodology
dramatically simplifies the design of acoustic devices and provides a key-step
towards realizing spatial sound modulators.