Synthetic phonons enable nonreciprocal coupling to arbitrary resonator networks.

Synthetic phonons enable nonreciprocal coupling to arbitrary resonator networks.
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DOI:
10.1126/sciadv.aat0232
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发表时间:
2018-06
期刊:
影响因子:
13.6
通讯作者:
Bahl G
Bahl G
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Peterson CW;Kim S;Bernhard JT;Bahl G

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Wavelike spatiotemporal modulation of discrete coupling elements creates synthetic phonons that enable nonreciprocal coupling. Inducing nonreciprocal wave propagation is a fundamental challenge across a wide range of physical systems in electromagnetics, optics, and acoustics. Recent efforts to create nonreciprocal devices have departed from established magneto-optic methods and instead exploited momentum-based techniques such as coherent spatiotemporal modulation of resonators and waveguides. However, to date, the nonreciprocal frequency responses that these devices can achieve have been limited, mainly to either broadband or Lorentzian-shaped transfer functions. We show that nonreciprocal coupling between waveguides and resonator networks enables the creation of devices with customizable nonreciprocal frequency responses. We create nonreciprocal coupling through the action of synthetic phonons, which emulate propagating phonons and can scatter light between guided and resonant modes that differ in both frequency and momentum. We implement nonreciprocal coupling in microstrip circuits and experimentally demonstrate both elementary nonreciprocal functions such as isolation and gyration, as well as reconfigurable, higher-order nonreciprocal filters. Our results suggest nonreciprocal coupling as a platform for a broad class of customizable nonreciprocal systems, adaptable to all wave phenomena.
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