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首页> 美国卫生研究院文献>Scientific Reports >Ultra-Broadband Nonlinearity Enhancement based on a Novel Graphene-Silicon Hybrid Waveguide: Structure Design and Theoretical Analysis
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Ultra-Broadband Nonlinearity Enhancement based on a Novel Graphene-Silicon Hybrid Waveguide: Structure Design and Theoretical Analysis

机译：基于新型石墨烯-硅混合波导的超宽带非线性增强：结构设计和理论分析

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摘要

A graphene-silicon hybrid waveguide with a dielectric spacer is proposed to enhance the nonlinear response in ultra-wide wavelength range by applying graphene’s broadband highly nonlinear optical properties. The chemical potential of the graphene layer is tuned to satisfy the resonance condition and hence a low propagation loss is obtained. The dielectric spacer is used for avoiding additional free-carrier-absorption loss due to carrier interchange between the silicon core and the graphene layer. Aiming at the special waveguide structure with ultra-thin graphene layer, a full-vectorial theoretical model is developed to analyze its nonlinear properties. The waveguide dimensions are optimized in terms of the nonlinear parameter. The proposed hybrid waveguide exhibits high nonlinearity enhancement in an ultra-broad wavelength region covering near-infrared and mid-infrared bands. The conversion efficiency for a degenerate four-wave mixing process reaches −18.5 dB only with a pump power of 0.5 W and a waveguide length of tens of microns. In the wavelength range of 1.3–2.3 μm, the conversion efficiency can be kept stable by adopting suitable waveguide geometry and length. The corresponding 3-dB bandwidth can reach 40–110 nm for each fixed pump. The graphene-silicon hybrid waveguide has the potential to support chip-scale nonlinear applications in both near- and mid-infrared bands.
机译：提出了一种带有电介质间隔物的石墨烯-硅混合波导，通过利用石墨烯的宽带高度非线性光学特性来增强超宽波长范围内的非线性响应。调节石墨烯层的化学势以满足共振条件，因此获得低的传播损耗。介电间隔物用于避免由于硅芯和石墨烯层之间的载流子交换而引起的额外的自由载流子吸收损失。针对具有超薄石墨烯层的特殊波导结构，建立了全矢量理论模型来分析其非线性特性。根据非线性参数优化波导尺寸。所提出的混合波导在覆盖近红外和中红外波段的超宽波长区域表现出高度的非线性增强。仅在泵浦功率为0.5 processW，波导长度为数十微米的情况下，简并四波混频过程的转换效率才达到-18.5 dB。在1.3–2.3μm的波长范围内，通过采用合适的波导几何形状和长度，可以保持转换效率稳定。对于每个固定泵浦，相应的3 dB带宽可以达到40–110 nm。石墨烯-硅混合波导具有支持近红外和中红外波段中芯片级非线性应用的潜力。

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