Unidirectional mechanical amplification as a design principle for an active microphone

Details Unidirectional mechanical amplification as a design principle for an active microphone Unidirectional mechanical amplification as a design principle for an active microphone

2011-04-14

arxiv.org/abs/1104.2871v1

Phys. Rev. Lett. 106, 158701 (2011)

Physics

Instrumentation and Detectors

4 pages, 3 figures plus supplementary information

Scientific paper

10.1103/PhysRevLett.106.158701

Amplification underlies the operation of many biological and engineering systems. Simple electrical, optical, and mechanical amplifiers are reciprocal: the backward coupling of the output to the input equals the forward coupling of the input to the output. Unidirectional amplifiers that occur often in electrical and optical systems are special non-reciprocal devices in which the output does not couple back to the input even though the forward coupling persists. Here we propose a scheme for unidirectional mechanical amplification that we utilize to construct an active microphone. We show that amplification improves the microphone's threshold for detecting weak signals and that unidirectionality prevents distortion.

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