论文标题
基于单向自我诱导的透明度
A passive bias-free ultrabroadband optical isolator based on unidirectional self-induced transparency
论文作者
论文摘要
在没有增益的情况下，实现宽带非偏置设备，对于现代光子技术和量子网络，任何外部偏见都非常具有挑战性，并且非常需要。在这里，我们从理论上提出了一种被动且无偏见的全光隔离器，用于飞秒激光脉冲，通过利用新的单向自我诱导透明度的新机制，该机制用非线性培养基获得，然后在一侧使用正常的吸收培养基获得。对于2π5FS激光脉冲，向前和向后方向之间的透射对比度可以达到约14.3 dB，这意味着隔离信号的超子带宽为200 THz。 20 dB的带宽约为57 nm，已经与磁光隔离器相当。该无腔的光学隔离器可以为超短激光脉冲的整合非磁性隔离铺平道路。
Achieving a broadband nonreciprocal device without gain and any external bias is very challenging and highly desirable for modern photonic technologies and quantum networks. Here, we theoretically propose a passive and bias-free all-optical isolator for a femtosecond laser pulse by exploiting a new mechanism of unidirectional self-induced transparency, obtained with a nonlinear medium followed by a normal absorbing medium at one side. The transmission contrast between the forward and backward directions can reach ~14.3 dB for a 2π5 fs laser pulse, implying isolation of a signal with an ultrabroad bandwidth of 200 THz. The 20 dB bandwidth is about 57 nm, already comparable with a magneto-optical isolator. This cavity-free optical isolator may pave the way to integrated nonmagnetic isolation of ultrashort laser pulses.
