Physics – Instrumentation and Detectors
Scientific paper
2011-04-14
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.
Hudspeth A. J.
Reichenbach Tobias
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