期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.053904
关键词
-
资金
- German Research Foundation [EI 391/13-2]
- CST, Darmstadt, Germany, with their Finite Integration Software Microwave Studio
- National Key Basic Research Special Foundation [2010CB923200]
- National Natural Science Foundation of China [11204386]
- Guangdong Natural Science Foundation [S2012040007812]
- EPSRC through the U.K. Silicon Photonics consortium
- EPSRC [EP/F001622/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F001622/1] Funding Source: researchfish
We demonstrate indirect photonic transitions in a silicon slow light photonic crystal waveguide. The transitions are driven by an optically generated refractive index front that moves along the waveguide and interacts with a signal pulse copropagating in the structure. We experimentally confirm a theoretical model which indicates that the ratio of the frequency and wave vector shifts associated with the indirect photonic transition is identical to the propagation velocity of the refractive index front. The physical origin of the transitions achieved here is fundamentally different than in previously proposed refractive index modulation concepts with fixed temporal and spatial modulation frequencies; as here, the interaction with the refractive index front results in a Doppler-like signal frequency and wave vector shift. Consequently, the bandwidth over which perfect mode frequency and wave vector matching is achieved is not intrinsically limited by the shape of the photonic bands, and tuning of the indirect photonic transitions is possible without any need for geometrical modifications of the structure. Our device is genuinely nonreciprocal, as it provides different frequency shifts for co- and counterpropagating signal and index fronts.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据