纳米材料覆盖的波导的可重构的非线性损失
Ayvaz Davletkhanov1, Aram Mkrtchyan1, Alexey Bunkov1
1Skolkovo Institute of Science and Technology, Moscow 121205, Russia.
Nanophotonics (Berlin, Germany)
|December 5, 2024
概括
在光学波导上的薄膜中控制光吸收可以意外地增加信号损失. 这项研究揭示了碳纳米管膜中复杂的非线性光学反应,为设计波导传输提供了新的方法.
科学领域:
- 纳米光子学 纳米光子学
- 材料科学 材料科学 材料科学
- 非线性光学是非线性光学.
背景情况:
- 具有可控制发射率的光学波导对于光学调制器和可和吸收器等设备至关重要.
- 在这种波导中的损失通常被认为与覆盖材料的吸收系数成正比.
研究的目的:
- 研究薄膜覆盖光学波导中的材料损失和传播损失之间的关系.
- 在波导上探索单壁碳纳米管 (SWCNT) 薄膜的非线性光学反应.
- 为了证明可控制的和吸收和光学限制行为之间的切换.
主要方法:
- 使用涂上SWCNT薄膜的侧抛光纤维波导.
- 采用短脉冲照明用于吸收和和电化学封闭用于减弱.
- 进行数值模拟来分析模式重塑效应.
- 制造设备以证明可调节的非线性光学响应.
主要成果:
- 观察到,在特定条件下,减少材料损失可以矛盾地增加波导传播损失.
- 确定了从和吸收到光学限制的过渡,对于厚度大于50nm的薄膜而言,具有非单调功率依赖性的光学限制.
- 数字模拟证实了模式重塑是这种非碎行为的原因.
- 成功制造了具有可切换非线性光学响应的设备.
结论:
- 简单的损失比例假设失败了,揭示了薄膜吸收和波导模式之间的复杂相互作用.
- 证明了能够在纳米材料覆盖的波导中设计可重新配置的非线性光学响应的能力.
- 分析方法可以预测用于设计先进光学设备的非线性吸收曲线.
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