硅基纳米光子集成回路中的模式转换与耦合
发布时间：2018-12-20 12:30
【摘要】：硅纳米光波导具有超高折射率差与超小横截面,因而具有超强光场限制能力,为实现超高集成度纳米光子回路提供了一种极具吸引力的途径。众所周知,在光子集成回路中,模式转换与耦合是实现各种功能器件的重要基础。对硅光子集成回路中的模式转换与耦合原理、新结构与新器件进行了详细分析和讨论。研究了硅纳米光波导锥形结构中模式传输及演化过程,揭示了其特有的偏振相关模式转换机制。结果表明,当光波导横截面存在不对称性时,可能在某些特定波导宽度范围内产生偏振模杂化,为实现偏振旋转提供了一种方便的方法。通过调控非对称定向耦合结构中模式转换与耦合的相位匹配条件,为实现超小型偏振分束器、大带宽模式复用-解复用器等关键器件提供重要途径。
[Abstract]:Silicon nanowaveguides have ultra-high refractive index difference and ultra-small cross section, so they have the ability to limit the light field, which provides a very attractive way to realize the ultra-integrated nanometer photonic circuit. It is well known that mode conversion and coupling are the important basis for the realization of various functional devices in the photonic integrated circuit. The principle of mode conversion and coupling in silicon photonic integrated circuit, the new structure and the new device are analyzed and discussed in detail. The mode propagation and evolution in the conical structure of silicon nanoscale optical waveguide are studied, and the polarization dependent mode conversion mechanism is revealed. The results show that polarization mode hybridization may occur in some specific waveguide width range when the cross section of optical waveguide is asymmetric, which provides a convenient method for realizing polarization rotation. By adjusting the phase matching condition between mode conversion and coupling in asymmetric directional coupling structure, it provides an important way to realize the key devices such as micro-polarization beam splitter, large-bandwidth mode multiplexer and demultiplexer.
【作者单位】： 浙江大学光电科学与技术学院光及电磁波研究中心;
【基金】：国家自然科学基金优秀青年基金(61422510) 国家自然科学基金委员会与香港研究资助局联合科研基金(61431166001)
【分类号】：TN256
本文编号：2387999
[Abstract]:Silicon nanowaveguides have ultra-high refractive index difference and ultra-small cross section, so they have the ability to limit the light field, which provides a very attractive way to realize the ultra-integrated nanometer photonic circuit. It is well known that mode conversion and coupling are the important basis for the realization of various functional devices in the photonic integrated circuit. The principle of mode conversion and coupling in silicon photonic integrated circuit, the new structure and the new device are analyzed and discussed in detail. The mode propagation and evolution in the conical structure of silicon nanoscale optical waveguide are studied, and the polarization dependent mode conversion mechanism is revealed. The results show that polarization mode hybridization may occur in some specific waveguide width range when the cross section of optical waveguide is asymmetric, which provides a convenient method for realizing polarization rotation. By adjusting the phase matching condition between mode conversion and coupling in asymmetric directional coupling structure, it provides an important way to realize the key devices such as micro-polarization beam splitter, large-bandwidth mode multiplexer and demultiplexer.
【作者单位】： 浙江大学光电科学与技术学院光及电磁波研究中心;
【基金】：国家自然科学基金优秀青年基金(61422510) 国家自然科学基金委员会与香港研究资助局联合科研基金(61431166001)
【分类号】：TN256
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