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Single-Nanowire Thermo-Optic Modulator Based on a Varshni Shift
ACS Photonics ( IF 6.5 ) Pub Date : 2020-08-03 , DOI: 10.1021/acsphotonics.0c00917 Zhangxing Shi 1 , Jue Gong 1 , Jianbin Zhang 1 , Peizhen Xu 1 , Ni Yao 1 , Wei Fang 1 , Pan Wang 1 , Xin Guo 1 , Limin Tong 1
ACS Photonics ( IF 6.5 ) Pub Date : 2020-08-03 , DOI: 10.1021/acsphotonics.0c00917 Zhangxing Shi 1 , Jue Gong 1 , Jianbin Zhang 1 , Peizhen Xu 1 , Ni Yao 1 , Wei Fang 1 , Pan Wang 1 , Xin Guo 1 , Limin Tong 1
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The rapid development of nanotechnology has spurred great efforts in improving thermo-optic (TO) modulators with higher performances for optical signal processing and interconnects, in which reducing the heating structure and increasing the heating efficiency is one of the most effective approaches to faster response and lower power consumption. Here we demonstrate a single-nanowire all-optical TO modulator based on a temperature-dependent Varshni shift of the band gap. A bottom-up grown single-crystal cadmium sulfide (CdS) nanowire, 170 nm in diameter and 13.5 μm in length, is used as an optical waveguide to handle the signal and an ultracompact nanoheater simultaneously when the signal and the switch light are copropagated through the nanowire. The switch-light-induced temperature change causes a band gap shift of the nanowire, which in turn modulates the signal light propagated inside. By merging the two functionalities in a single nanowire, such an all-optical TO modulator shows the following advantages: faster response, ultrasmall footprint, high heating efficiency, and low power consumption. Using a switch light with 91 μW of power and a 405 nm wavelength, a modulation depth of ∼86% was achieved for a signal light with 287 μW of power and a 515 nm wavelength, with a modulation time less than 20 μs.
中文翻译：
基于Varshni位移的单纳米线热光调制器
纳米技术的飞速发展促使人们大力改进具有更高性能的热光（TO）调制器，以用于光信号处理和互连，其中减少加热结构和提高加热效率是提高响应速度和提高响应速度的最有效方法之一。降低功耗。在这里，我们展示了基于带隙的温度相关Varshni位移的单纳米线全光TO调制器。自底向上生长的直径为170 nm，长度为13.5μm的单晶硫化镉（CdS）纳米线用作光波导，以在信号和开关光共同传播时同时处理信号和超小型纳米加热器。纳米线。开关光引起的温度变化导致纳米线的带隙位移，依次调制在内部传播的信号光。通过将两个功能合并到一条纳米线中，这样的全光TO调制器具有以下优点：响应速度更快，占用空间小，加热效率高，功耗低。使用功率为91μW，波长为405 nm的开关灯，对于功率为287μW，波长为515 nm的信号光，调制时间小于20μs，调制深度约为86％。
更新日期：2020-09-16
中文翻译：
基于Varshni位移的单纳米线热光调制器
纳米技术的飞速发展促使人们大力改进具有更高性能的热光（TO）调制器，以用于光信号处理和互连，其中减少加热结构和提高加热效率是提高响应速度和提高响应速度的最有效方法之一。降低功耗。在这里，我们展示了基于带隙的温度相关Varshni位移的单纳米线全光TO调制器。自底向上生长的直径为170 nm，长度为13.5μm的单晶硫化镉（CdS）纳米线用作光波导，以在信号和开关光共同传播时同时处理信号和超小型纳米加热器。纳米线。开关光引起的温度变化导致纳米线的带隙位移，依次调制在内部传播的信号光。通过将两个功能合并到一条纳米线中，这样的全光TO调制器具有以下优点：响应速度更快，占用空间小，加热效率高，功耗低。使用功率为91μW，波长为405 nm的开关灯，对于功率为287μW，波长为515 nm的信号光，调制时间小于20μs，调制深度约为86％。
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