Nonreciprocal Fabry-Perot effect and performance enhancement in a magneto-optical InSb-based Faraday terahertz isolator
Nonreciprocal Fabry-Perot effect and performance enhancement in a magneto-optical InSb-based Faraday terahertz isolator
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DOI：
10.1364/oe.411581
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发表时间：
2020-12-07
期刊：
影响因子：
3.8
通讯作者：
Talbayev, Diyar
中科院分区：
文献类型：
--
作者：
Keshock, Elise;Peng, Peisong;Talbayev, Diyar
由于半导体InSb中传导电子的回旋共振引起的法拉第效应，使得在我们的法拉第THz隔离器中，在小磁场的存在下工作的透射光具有非互易性。我们选择InSb作为我们的隔离器的有效介质，因为它的高电子迁移率，低电子有效质量，和窄的带隙。隔离器性能的实验测量表明，最大实现隔离功率为18.8 dB，插入损耗为-12.6 dB。我们的光学器件的分析指出，一个显着的非互易法布里-珀罗效应的磁光InSb层的起源的多重隔离增强。这种非互易性发生在向前方向的法布里-珀罗反射相长地相加并增强某些频率下的透射率，而向后方向的法布里-珀罗反射相消地相加并抑制相同频率下的透射率。(C)根据OSA开放获取出版协议的条款，2020年美国光学学会
The Faraday effect due to the cyclotron resonance of conduction electrons in semiconductor InSb allows for nonreciprocity of transmitted light in our Faraday THz isolator operating in the presence of a small magnetic field. We select InSb as an efficient medium for our isolator due to its high electron mobility, low electron effective mass, and narrow band gap. Experimental measurements of the isolator performance indicate a maximum achieved isolation power of 18.8 dB with an insertion loss of -12.6 dB. Our optical analysis of the device points to a remarkable nonreciprocal Fabry-Perot effect in the magneto-optical InSb layer as the origin of the multi-fold isolation enhancement. This nonreciprocity occurs as the Fabry-Perot reflections in the forward direction add constructively and enhance the transmittance at certain frequencies, while the Fabry-Perot reflections in the backward direction add destructively and suppress the transmittance at the same frequencies. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement