Exceptional point magneto-optic isolators
Exceptional point magneto-optic isolators
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DOI：
10.1364/oe.423426
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发表时间：
2021-07-05
期刊：
影响因子：
3.8
通讯作者：
Giebink, Noel C.
中科院分区：
文献类型：
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作者：
Grede, Alex J.;Krainova, Nina;Giebink, Noel C.
结果表明，磁光耦合环形隔离器工作在例外点(EP)附近，从根本上改善了隔离带宽和插入损耗之间的折衷。与EP传感器类似，在EP下操作耦合环隔离器会导致其隔离带宽取决于非互易相移(NRPS)的平方根，而不是通常的线性相关性，从而在NRPS较小时提高带宽。在实际需要的情况下，对于给定的环对，这一行为使得在插入损耗为3分贝的情况下，20分贝的隔离带宽增加了50%以上。EP操作的优势在磁光材料共振附近增长，并应扩展到依赖于类似弱非互易扰动的其他类型的片上隔离器。(C)OSA开放获取出版协议条款下的2021年美国光学学会
We show that operating magneto-optic coupled ring isolators near an exceptional point (EP) fundamentally improves their tradeoff between isolation bandwidth and insertion loss. In analogy to EP sensors, operating a coupled ring isolator at an EP causes its isolation bandwidth to depend on the square root of the nonreciprocal phase shift (NRPS) instead of the usual linear dependence, thereby enhancing the bandwidth when the NRPS is small. In cases of practical interest, this behavior enables more than a 50% increase in 20 dB isolation bandwidth at 3 dB insertion loss for a given pair of rings. The advantage of EP operation grows in the vicinity of magneto-optic material resonances and should extend to other types of on-chip isolators that rely on similarly weak nonreciprocal perturbations. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement