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Updated: Feb 15, 2026

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
Published on: August 27, 2013
Simultaneous realization of slow and fast acoustic waves using a fractal structure of Koch curve
Jin Ding1, Li Fan2, Shu-Yi Zhang1
1Lab of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing, 210093, P. R. China.
Abstract:
An acoustic metamaterial based on a fractal structure, the Koch curve, is designed to simultaneously realize slow and fast acoustic waves. Owing to the multiple transmitting paths in the structure resembling the Koch curve, the acoustic waves travelling along different paths interfere with each other. Therefore, slow waves are created on the basis of the resonance of a Koch-curve-shaped loop, and meanwhile, fast waves even with negative group velocities are obtained due to the destructive interference of two acoustic waves with opposite phases. Thus, the transmission of acoustic wave can be freely manipulated with the Koch-curve shaped structure.
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