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arXiv 2007.05031physics.optics
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三种几何形状的AlGaAs波导中的可调谐四波混频

Tunable Four-Wave Mixing in AlGaAs Waveguides of Three Different Geometries

Daniel H. G. Espinosa, Kashif M. Awan, Mfon Odungide, Stephen R. Harrigan, David R. Sanchez J., Ksenia Dolgaleva

摘要:

AlGaAs材料平台由于其优异的非线性光学特性,已被广泛用于开发非线性光子器件。我们提出了一种新的AlGaAs波导的几何形状,称为半芯蚀刻,这代表了两个先前研究的几何形状,即纳米线和条形加载波导之间的妥协,结合其最佳品质。我们进行了可调谐四波混频(FWM)实验,在所有这三个几何形状的电信C波段(波长约1550 nm),与脉冲泵浦光束和连续波(CW)信号光束。在纳米线、条形加载和半芯几何结构中实现的最大四波混频峰值效率分别为约-5dB、-8dB和-9dB。这些值是AlGaAs波导中报道的最高值之一。信号到空闲转换范围也是显著的:161 nm的带状加载和半芯波导和152 nm的纳米线。基于我们的研究结果,我们得出结论,半芯的几何形状是一种替代的方法,纳米线的几何形状,这已被认为是最有效的几何形状,在半带隙以上的光谱区域进行波长转换。此外,我们表明,半芯几何形状表现出更少的问题与多光子吸收比纳米线几何形状。

英文摘要:

The AlGaAs material platform has been intensively used to develop nonlinear photonic devices on-a-chip, thanks to its superior nonlinear optical properties. We propose a new AlGaAs waveguide geometry, called half-core etched, which represents a compromise between two previously studied geometries, namely the nanowire and strip-loaded waveguides, combining their best qualities. We performed tunable four-wave mixing (FWM) experiments in all three of these geometries in the telecommunications C-band (wavelengths around 1550 nm), with a pulsed pump beam and a continuous-wave (CW) signal beam. The maximum FWM peak efficiencies achieved in the nanowire, strip-loaded and half-core geometries were about -5 dB, -8 dB and -9 dB, respectively. These values are among the highest reported in AlGaAs waveguides. The signal-to-idler conversion ranges were also remarkable: 161 nm for the strip-loaded and half-core waveguides and 152 nm for the nanowire. Based on our findings, we conclude that the half-core geometry is an alternative approach to the nanowire geometry, which has been earlier deemed the most efficient geometry, to perform wavelength conversion in the spectral region above the half-bandgap. Moreover, we show that the half-core geometry exhibits fewer issues associated with multiphoton absorption than the nanowire geometry.

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