非线性系统
互惠(文化人类学)
谐振器
隔离器
传输(电信)
法诺平面
透射系数
物理
计算机科学
Q系数
质量(理念)
控制理论(社会学)
光学
电信
电子工程
数学
量子力学
工程类
心理学
社会心理学
控制(管理)
人工智能
纯数学
作者
Dimitrios L. Sounas,Andrea Alù
出处
期刊:Physical review
[American Physical Society]
日期:2018-03-20
卷期号:97 (11)
被引量:70
标识
DOI:10.1103/physrevb.97.115431
摘要
Nonlinear isolators have attracted significant attention for their ability to break reciprocity and provide isolation without the need of an external bias. A popular approach for the design of such devices is based on Fano resonators, which, due to their sharp frequency response, can lead to very large isolation for moderate input intensities. Here, we show that, independent of their specific implementation, these devices are subject to fundamental bounds on the transmission coefficient in the forward direction versus their quality factor, input power, and nonreciprocal intensity range. Our analysis quantifies a general tradeoff between forward transmission and these metrics, stemming directly from time-reversal symmetry, and that unitary transmission is only possible for vanishing nonreciprocity. Our results also shed light on the operation of resonant nonlinear isolators, reveal their fundamental limitations, and provide indications on how it is possible to design nonlinear isolators with optimal performance.
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