Tunable Plasmon鈥揚honon Polaritons in Layered Graphene鈥揌exagonal Boron Nitride Heterostructures

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• 作者：Yichen Jia ; Huan Zhao ; Qiushi Guo ; Xiaomu Wang ; Han Wang ; Fengnian Xia
• 刊名：ACS Photonics
• 出版年：2015
• 出版时间：July 15, 2015
• 年：2015
• 卷：2
• 期：7
• 页码：907-912
• 全文大小：502K
• ISSN：2330-4022

文摘

We use infrared spectroscopy to explore the hybridization of graphene plasmons and hexagonal boron nitride (hBN) phonons in their heterostructures with different compositions. We show that the degree of plasmon鈥損honon hybridization and the slowing of the light group velocity within the infrared transparency window due to the plasmon鈥損honon destructive interference are dominated by hBN phonon oscillating strength, which can be tuned by varying the hBN thickness in a layer-by-layer manner. However, the plasmon oscillating strength in metallic graphene governs the magnitude of infrared extinction, which exceeds 6% at around 7 渭m in a graphene/hBN/graphene heterostructure due to the strong plasmon dipole鈥揹ipole coupling. Our work demonstrates that the infrared optical responses of graphene鈥揾BN heterostructures can be engineered by controlling the coupling strength of plasmon鈥損honon hybridization and the overall plasmon oscillating strength simultaneously, thus opening the avenue for the light manipulation and detection in the mid-infrared regime based on such layered heterostructures.