Wu Haodong, Tang Jiangshan, Chen Mingyuan, Xiao Min, Lu Yanqing, Xia Keyu, Nori Franco
Opt Express. 2024 Mar 25;32(7):11010-11021. doi: 10.1364/OE.507019.
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 magnetic-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 2π - 5 fs laser pulse. The 20 dB bandwidth is about 56 nm, already comparable with a magneto-optical isolator. This work provides a new mechanism which may benefit non-magnetic isolation of ultrashort laser pulses.
在不具备增益和任何外部偏置的情况下实现宽带非互易器件，对于现代光子技术和量子网络而言极具挑战性且十分必要。在此，我们从理论上提出了一种用于飞秒激光脉冲的无源且无磁的全光隔离器，该隔离器利用了一种单向自感应透明的新机制，通过在一侧使用非线性介质后接普通吸收介质来实现。对于2π - 5飞秒的激光脉冲，正向和反向之间的传输对比度可达14.3分贝。20分贝带宽约为56纳米，已与磁光隔离器相当。这项工作提供了一种新机制，可能有益于超短激光脉冲的非磁隔离。
