title: Silicon optical diode based on cascaded photonic crystal cavities.
abstract: An all-silicon passive optical diode based on optical nonlinearity in cascaded photonic crystal (PhC) L3 cavities is proposed and demonstrated. A nonreciprocal transmission ratio (NTR) of 30.8 dB and insertion loss of 8.3 dB are realized in the device. The device has a relatively broad 17 dB operation bandwidth of 0.08 nm, and at least 16 dB of NTR is achieved when input power varies between -6.25   and -2.95  dBm. A nonlinear couple mode model for cascaded PhC cavities is established to analyze the behavior of the device, and numerical simulation results are in good agreement with the experiment results.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhang
authors.forename: Danping
authors.initials: D
authors.lastname: Li
authors.forename: Cheng
authors.initials: C
authors.lastname: Zeng
authors.forename: Zengzhi
authors.initials: Z
authors.lastname: Huang
authors.forename: Yi
authors.initials: Y
authors.lastname: Wang
authors.forename: Qingzhong
authors.initials: Q
authors.lastname: Huang
authors.forename: Ying
authors.initials: Y
authors.lastname: Wu
authors.forename: Jinzhong
authors.initials: J
authors.lastname: Yu
authors.forename: Jinsong
authors.initials: J
authors.lastname: Xia