基于ZGP的微米级波导平台中模式传输的理论论证
Theoretical demonstration of mode transmission in ZGP-based micrometer waveguide platforms
AI总结：
本研究对ZGP-on-SiO2微米级波导的模式传输开展理论表征，计算出2-12μm波段TE、TM模的低传输损耗，发现模式损耗无明显角振荡及TM模模式交叉现象，为ZGP及同类双折射晶体波导的优化设计提供参考。
摘要：
基于双折射相位匹配的二阶非线性（χ(2)）ZnGeP2（ZGP）波导平台近期因优异的中红外激光产生性能被报道。本文针对ZGP-on-SiO2微米级ZGP波导平台，开展了考虑波导各向异性和衬底材料吸收的模式传输详细理论表征。得益于ZGP与衬底（SiO2/空气）之间的高折射率差，在2-12μm的目标波长范围内，所设计的ZGP波导中横电（TE）和横磁（TM）模式的传输损耗经计算分别低于1.5 dB/cm和4 dB/cm。值得注意的是，观测到模式传输损耗随相位匹配角的振荡并不明显，这与此前报道的弱导各向异性波导中的情况不同。本研究的波导平台中还展现出一种重要现象：TM偏振在部分波长处存在模式交叉，该现象会损害波导性能，实际应用中可通过改变相位匹配角加以避免。这项工作为未来ZGP波导的设计优化提供了重要参考，同时也显示出可推广至其他双折射晶体波导平台的扩展性。
英文摘要：
Birefringence phase-matching based \c{hi}(2) ZnGeP2 (ZGP) waveguide platform has been recently reported for excellent mid-infrared laser generation. Here, a detailed theoretical characterization of mode transmission taking waveguide anisotropy and substrate material absorption into account in a micrometer ZGP waveguide platform (ZGP-on-SiO2) is conducted. Benefited from high-index contrast between ZGP and substrate (SiO2/Air), Transverse electric and magnetic (TM and TE) mode transmission loss at interested wavelengths range of 2 - 12 μm is calculated to be less than 4 dB/cm and 1.5 dB/cm, respectively, in the designed ZGP waveguide. Notably, non-obvious oscillation of mode transmission loss versus phase-matching angles is observed, which is different from that in the previously reported weakly guided anisotropic waveguide. A vital phenomenon named mode crossing at some wavelengths in TM polarization is also exhibited in our waveguide platforms, which jeopardizes waveguide performances and could be avoided by changing the phase-matching angle in practice. This work provides a significant indication of ZGP waveguide design optimization in future and also exhibits extendibility to other birefringent crystal waveguide platforms.
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