Fast response 2×2 thermo-optic switch with polymer/silica hybrid waveguide

A polymer/silica hybrid 2×2 multimode-interference Mach-Zehnder interferometer thermo-optic (TO) switch is designed and fabricated. Instead of polymer, silica is used as under-cladding to accelerate heat release because of its large thermal conductivity. The developed switch exhibits low power consumption of 6.2 mW, low crosstalk of about -28 dB, and short response time. The rise and fall times of 103 and 91 μs for this hybrid switch are shortened by 40.8% and 52.4%, respectively, compared with those of the fabricated TO switch (174 and 191 μs) using polymer as both upperand under-claddings.     

类铍BⅡ离子激发态的相对论能量和精细结构

利用多组态相互作用方法及Rayleigh-Ritz变分法,计算了类铍BⅡ1s²2s^{2 1}S,1s²2s2p¹P⁰,1s²2s2p³P⁰和1s²2p^{2 3}P激发态的能量.运用截断变分方法得到能量的改进量.计算了相对论修正、质量极化效应,从而获得了高 关键词： 类铍离子 精细结构 振子强度 辐射跃迁     

锂内壳高激发2smd4De,2pnd4Do系列的能量和辐射跃迁

采用鞍点变分方法计算了锂内壳高激发四重态1s2smd⁴D^e(m=3—7)和1s2pnd⁴D^o(n=3—5)的能量,利用截断变分方法得到能量改进量,并计算了相对论修正、质量极化效应,从而获得了高精度的能量计算值.同时还对该系统之间的辐射跃迁波长、振子强度和辐射跃迁率进行了计算.计算结果与实验符合得很好. 关键词： 内壳高激发态 鞍点变分方法 振子强度 精细结构     

Modulation of Steady-State Heat Transport in a Dissipative Multi-Mode Qubit-Photon System

Quantum heat transport is considered as an indispensable branch of quantum thermodynamics to potentially improve performance of thermodynamic devices. We theoretically propose a dissipative qubit-photon system composed of multiple coupled resonators interacting with a single two-level qubit, to explore the steady-state heat transport by tuning both the inter-resonator photon hopping and the qubit-photon coupling. Specifically in the three-mode case, the dramatic enhancement and suppression of th...