标题： 横向光学图案的全光开关 显示英文标题

标题： All-Optical Switching with Transverse Optical Patterns

摘要： 我们展示了一个在超低光强水平下运行的全光开关，并表现出在光交换网络中使用所需的几个特性。 一个输入切换光束，波长为$\lambda$，能量密度为$10^{-2}$光子每光学截面积 [$\sigma=\lambda^2/(2\pi)$] ，改变了通过温铷蒸气中的参量不稳定性生成的双点图案的方向。 该不稳定性由小于 1 mW 的总泵浦功率引发，并产生多个$\mu$W 的输出光。 该开关可级联：该设备的输出能够驱动多个输入，并在饱和和中间响应区域表现出类似晶体管的信号级恢复。 此外，系统需要的输入功率与响应时间的倒数成正比，这表明热耗散不一定限制光学逻辑器件的实用性。 显示英文摘要

摘要： We demonstrate an all-optical switch that operates at ultra-low-light levels and exhibits several features necessary for use in optical switching networks. An input switching beam, wavelength $\lambda$, with an energy density of $10^{-2}$ photons per optical cross section [$\sigma=\lambda^2/(2\pi)$] changes the orientation of a two-spot pattern generated via parametric instability in warm rubidium vapor. The instability is induced with less than 1 mW of total pump power and generates several $\mu$Ws of output light. The switch is cascadable: the device output is capable of driving multiple inputs, and exhibits transistor-like signal-level restoration with both saturated and intermediate response regimes. Additionally, the system requires an input power proportional to the inverse of the response time, which suggests thermal dissipation does not necessarily limit the practicality of optical logic devices.