Ooi Kelvin J A, Leong Peng Chuen, Ang Lay Kee, Tan Dawn T H
SUTD-MIT International Design Center, Singapore University of Technology and Design, 8 Somapah Road, Singapore, 487372, Singapore.
Sci Rep. 2017 Oct 6;7(1):12748. doi: 10.1038/s41598-017-13213-6.
The hallmark of silicon photonics is in its low loss at the telecommunications wavelength, economic advantages and compatibility with CMOS design and fabrication processes. These advantages are however impeded by its relatively low Kerr coefficient that constrains the power and size scaling of nonlinear all-optical silicon photonic devices. Graphene, with its unprecedented high Kerr coefficient and uniquely thin-film structure, makes a good nonlinear material to be easily integrated onto all-optical silicon photonic waveguide devices. We study the design of all-optical graphene-on-silicon (GOS) waveguide modulators, and find the optimized performance of MW cm in optical pump intensities and sub-mm device lengths. The improvements brought by the integration of graphene onto silicon photonic waveguides could bring us a step closer to realising compact all-optical control on a single chip.
硅光子学的特点在于其在电信波长下的低损耗、经济优势以及与CMOS设计和制造工艺的兼容性。然而，这些优势受到其相对较低的克尔系数的阻碍，该系数限制了非线性全光硅光子器件的功率和尺寸缩放。石墨烯具有前所未有的高克尔系数和独特的薄膜结构，是一种易于集成到全光硅光子波导器件上的优良非线性材料。我们研究了全光硅基石墨烯（GOS）波导调制器的设计，并在光泵浦强度和亚毫米器件长度方面发现了兆瓦每平方厘米的优化性能。将石墨烯集成到硅光子波导上所带来的改进可以使我们更接近在单个芯片上实现紧凑的全光控制。
