【摘要】：硅納米光波導(dǎo)具有超高折射率差與超小橫截面,因而具有超強(qiáng)光場(chǎng)限制能力,為實(shí)現(xiàn)超高集成度納米光子回路提供了一種極具吸引力的途徑。眾所周知,在光子集成回路中,模式轉(zhuǎn)換與耦合是實(shí)現(xiàn)各種功能器件的重要基礎(chǔ)。對(duì)硅光子集成回路中的模式轉(zhuǎn)換與耦合原理、新結(jié)構(gòu)與新器件進(jìn)行了詳細(xì)分析和討論。研究了硅納米光波導(dǎo)錐形結(jié)構(gòu)中模式傳輸及演化過程,揭示了其特有的偏振相關(guān)模式轉(zhuǎn)換機(jī)制。結(jié)果表明,當(dāng)光波導(dǎo)橫截面存在不對(duì)稱性時(shí),可能在某些特定波導(dǎo)寬度范圍內(nèi)產(chǎn)生偏振模雜化,為實(shí)現(xiàn)偏振旋轉(zhuǎn)提供了一種方便的方法。通過調(diào)控非對(duì)稱定向耦合結(jié)構(gòu)中模式轉(zhuǎn)換與耦合的相位匹配條件,為實(shí)現(xiàn)超小型偏振分束器、大帶寬模式復(fù)用-解復(fù)用器等關(guān)鍵器件提供重要途徑。
[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.
【作者單位】： 浙江大學(xué)光電科學(xué)與技術(shù)學(xué)院光及電磁波研究中心;
【基金】：國家自然科學(xué)基金優(yōu)秀青年基金(61422510) 國家自然科學(xué)基金委員會(huì)與香港研究資助局聯(lián)合科研基金(61431166001)
【分類號(hào)】：TN256

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