Graphene/h-BN plasmon-phonon coupling and plasmon delocalization observed by infrared nano-spectroscopy

被引:53
作者
Barcelos, Ingrid D. [1 ,2 ]
Cadore, Alisson R. [1 ]
Campos, Leonardo C. [1 ]
Malachias, Angelo [1 ]
Watanabe, K. [3 ]
Taniguchi, T. [3 ]
Maia, Francisco C. B. [4 ]
Freitas, Raul [4 ]
Deneke, Christoph [2 ]
机构
[1] Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
[2] Lab Nacl Nanotecnol LNNano CNPEM, BR-13083100 Sao Paulo, Brazil
[3] Natl Inst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan
[4] Lab Nacl Luz Sincrotron LNLS CNPEM, BR-13083100 Sao Paulo, Brazil
关键词
NEAR-FIELD MICROSCOPY; HEXAGONAL BORON-NITRIDE; SYNCHROTRON-RADIATION; CRYSTALS; MODES; HETEROSTRUCTURES; OPTOELECTRONICS; OPPORTUNITIES; ELECTRONICS; POLARITONS;
D O I
10.1039/c5nr01056j
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We observed the coupling of graphene Dirac plasmons with different surfaces using scattering-type scanning near-field optical microscopy integrated into a mid-infrared synchrotron-based beamline. A systematic investigation of a graphene/hexagonal boron nitride (h-BN) heterostructure is carried out and compared with the well-known graphene/SiO2 heterostructure. Broadband infrared scanning nearfield optical microscopy imaging is able to distinguish between the graphene/h-BN and the graphene/SiO2 heterostructure as well as differentiate between graphene stacks with different numbers of layers. Based on synchrotron infrared nanospectroscopy experiments, we observe a coupling of surface plasmons of graphene and phonon polaritons of h-BN (SPPP). An enhancement of the optical band at 817 cm(-1) is observed at graphene/h-BN heterostructures as a result of hybridization between graphene plasmons and longitudinal optical phonons of h-BN. Furthermore, longitudinal optical h-BN modes are preserved on suspended graphene regions (bubbles) where the graphene sheet is tens of nanometers away from the surface while the amplitude of transverse optical h-BN modes decrease.
引用
收藏
页码:11620 / 11625
页数:6
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