Enhanced Directional Emission from Monolayer WSe2 Integrated onto a Multiresonant Silicon-Based Photonic Structure
Enhanced Directional Emission from Monolayer WSe2 Integrated onto a Multiresonant Silicon-Based Photonic Structure
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DOI：
10.1021/acsphotonics.7b00550
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发表时间：
2017-08
期刊：
影响因子：
7
通讯作者：
Haitao Chen;S. Nanz;A. Abass;Jingshi Yan;Tingge Gao;D. Choi;Y. Kivshar;C. Rockstuhl;D. Neshev
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文献类型：
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作者：
Haitao Chen;S. Nanz;A. Abass;Jingshi Yan;Tingge Gao;D. Choi;Y. Kivshar;C. Rockstuhl;D. Neshev
像WSe2这样的二维过渡金属二卤化物由于其先进的光电性能和与硅光子学平台的兼容性，在芯片上作为多功能原子尺度光源显示出巨大的前景。然而，这种活性材料的亚纳米厚度限制了它们的发射效率。因此，需要新的方法来同时增强排放和控制其方向性。在这里，我们演示了集成到硅光子结构上的WSe2单层的增强和定向发射。这是通过将WSe2层耦合到多谐振硅光栅-波导结构来实现的。与该结构支持的多个谐振模式的相互作用提供了同时的激发和发射增强，而模式的色散进一步将发射引导到指定的方向。此外，我们的混合结构提供了超快发射调制的机会，由于减少了发射...
Two-dimensional transition-metal dichalcogenides such as WSe2 show great promise as versatile atomic-scale light sources for on-chip applications due to their advanced optoelectronic properties and compatibility with a silicon photonics platform. However, the sub-nanometer thickness of such active materials limits their emission efficiency. Hence, new approaches to simultaneously enhance the emission and control its directionality are required. Here, we demonstrate enhanced and directional emission from a WSe2 monolayer integrated onto a silicon photonic structure. This is achieved by coupling of the WSe2 layer to a multiresonant silicon grating-waveguide structure. The interaction with the multiple resonant modes supported by the structure provides simultaneous excitation and emission enhancement, while the dispersion of the modes further routes the emission into specified directions. In addition, our hybrid structure offers the opportunity for ultrafast emission modulation, owing to the reduced emission...