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arXiv 1009.4465cond-mat.mes-hallcond-mat.mtrl-sci
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用于高速光通信的石墨烯光电探测器

Graphene photodetectors for high-speed optical communications

Thomas Mueller, Fengnian Xia, Phaedon Avouris

摘要:

虽然硅在固态电子学中占据主导地位已有四十多年,但各种新材料已被引入光子学中,以扩大可访问的波长范围并提高光子器件的性能。例如,氮化镓基材料能够实现蓝光和紫外波长的光发射,而高折射率对比度绝缘体上硅有助于实现超密集和CMOS兼容的光子器件。在这里,我们报告了石墨烯(一种二维碳材料)作为10 Gbits/s光学数据链中的光检测元件的首次部署。在这种叉指型金属-石墨烯-金属光电探测器中,采用非对称金属化方案来打破常规石墨烯场效应晶体管沟道中内置电场分布的镜像对称性,从而允许在整个光照射区域内进行有效的光电探测。在1.55 μm波长处获得了6.1mA/W的最大外部光响应度,考虑到材料的厚度小于1 nm,这是一个非常令人印象深刻的值。此外,由于石墨烯独特的能带结构和优异的电子特性,使用这种迷人的材料可以实现具有至少从300 nm到6 μm的超宽工作波长范围的高速光电探测器。

英文摘要:

While silicon has dominated solid-state electronics for more than four decades, a variety of new materials have been introduced into photonics to expand the accessible wavelength range and to improve the performance of photonic devices. For example, gallium-nitride based materials enable the light emission at blue and ultraviolet wavelengths, and high index contrast silicon-on-insulator facilitates the realization of ultra dense and CMOS compatible photonic devices. Here, we report the first deployment of graphene, a two-dimensional carbon material, as the photo-detection element in a 10 Gbits/s optical data link. In this interdigitated metal-graphene-metal photodetector, an asymmetric metallization scheme is adopted to break the mirror symmetry of the built-in electric-field profile in conventional graphene field-effect-transistor channels, allowing for efficient photo-detection within the entire area of light illumination. A maximum external photo-responsivity of 6.1 mA/W is achieved at 1.55 μm wavelength, a very impressive value given that the material is below one nanometer in thickness. Moreover, owing to the unique band structure and exceptional electronic properties of graphene, high speed photodetectors with an ultra-wide operational wavelength range at least from 300 nm to 6 μm can be realized using this fascinating material.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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