Strong Enhancement of Light-Matter Interaction in Graphene Coupled to a Photonic Crystal Nanocavity
Strong Enhancement of Light-Matter Interaction in Graphene Coupled to a Photonic Crystal Nanocavity
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DOI：
10.1021/nl302746n
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发表时间：
2012-11-01
期刊：
影响因子：
10.8
通讯作者：
Englund, Dirk
中科院分区：
文献类型：
--
作者：
Gan, Xuetao;Mak, Kin Fai;Englund, Dirk
我们证明，通过与光子晶体纳米腔中的局域模式耦合，光与石墨烯的相互作用大大增强。光谱研究表明，石墨烯单原子层可将腔反射降低一百倍以上，同时也大幅降低腔品质因数。强相互作用允许在石墨烯样品的亚波长区域进行腔增强拉曼光谱。耦合模式理论模型与实验观察结果相符，表明石墨烯层的光吸收显着增加。耦合石墨烯腔系统还可以精确测量石墨烯的复折射率。
We demonstrate a large enhancement in the interaction of light with graphene through coupling with localized modes in a photonic crystal nanocavity. Spectroscopic studies show that a single atomic layer of graphene reduces the cavity reflection by more than a factor of one hundred, while also sharply reducing the cavity quality factor. The strong interaction allows for cavity-enhanced Raman spectroscopy on subwavelength regions of a graphene sample. A coupled mode theory model matches experimental observations and indicates significantly increased light absorption in the graphene layer. The coupled graphene cavity system also enables precise measurements of graphene's complex refractive index.