[20p-221B-1~11] 4.5 Nanocarbon and 2D Materials

▲ [20p-221B-10] Enhanced Raman Scattering of Graphene using Double Resonance in Silicon Photonic Crystal Nanocavities

〇Widianta Gomulya¹, Hidenori Machiya^1,2, Kotaro Kashiwa², Taiki Inoue², Chiashi Shohei², Shigeo Maruyama^2,3, Yuichiro Kato¹ (1.RIKEN, 2.Univ. of Tokyo, 3.AIST)

Keywords:photonic crystal, graphene, Raman

We demonstrate enhancements of Raman scattering from graphene on L3 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.