Enhanced Raman scattering of graphene using double resonance in silicon photonic crystal nanocavities
Enhanced Raman scattering of graphene using double resonance in silicon photonic crystal nanocavities
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DOI：
10.1063/1.5042798
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发表时间：
2018-06
影响因子：
4
通讯作者：
W. Gomulya;H. Machiya;K. Kashiwa;T. Inoue;S. Chiashi;S. Maruyama;Y. Kato
中科院分区：
文献类型：
--
作者：
W. Gomulya;H. Machiya;K. Kashiwa;T. Inoue;S. Chiashi;S. Maruyama;Y. Kato
我们利用双共振证明了二维光子晶体上石墨烯拉曼散射的增强，这源于局域导模和腔模的同时增强。通过调整光子晶体腔参数，可以将双共振调谐到G'拉曼散射。当激发和发射波长满足双共振条件时，激发波长依赖性测量显示拉曼峰大幅增强。此外，进行空间成像测量以确认增强位于腔体处，我们发现增强的拉曼强度比基底上拉曼信号大 60 倍。观察到的拉曼散射腔增强为硅光子学石墨烯基光源的开发开辟了新的可能性。
We demonstrate enhancements of Raman scattering from graphene on two-dimensional photonic crystals using double resonances, which originate from simultaneous enhancements by a localized guided mode and a cavity mode. By adjusting the photonic crystal cavity parameters, the double resonance can be tuned to the G' Raman scattering. Excitation wavelength dependence measurements show a large Raman peak enhancement when the excitation and emission wavelengths meet the double resonance condition. Furthermore, spatial imaging measurements are performed to confirm that the enhancement is localized at the cavity, and we find that the enhanced Raman intensity is 60 times larger compared to the on-substrate Raman signal. The observed cavity enhancement of Raman scattering opens up new possibilities for the development of graphene-based light sources for silicon photonics.