Towards altering sound frequency at will by a linear meta-layer | ResearchBunny

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Abstract

This paper introduces a linear mechanism to convert wave frequency to any desired value using a digitally pre-defined, time-varying material property. The device, an electromagnetic diaphragm with a MOSFET-controlled shunt circuit, achieves an acoustic impedance modulation ratio of up to 45. Experiments demonstrate audible sound conversion to infrasound and ultrasound, and a monochromatic tone to white noise via randomized MOSFET time sequences. Potential applications include super-resolution imaging, sub-wavelength energy flow control, and encrypted underwater communication.

Publisher

Communications Physics

Published On

Sep 29, 2021

Authors

Yumin Zhang, Keming Wu, Chunqi Wang, Lixi Huang

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