Negative Refraction with Superior Transmission in GrapheneHexagonal Boron Nitride (hBN) Multilayer Hyper Crystal

被引:57
作者
Al Sayem, Ayed [1 ]
Rahman, Md. Masudur [1 ]
Mahdy, M. R. C. [1 ,2 ]
Jahangir, Ifat [1 ,3 ]
Rahman, Md. Saifur [1 ]
机构
[1] Bangladesh Univ Engn & Technol, Dept EEE, Dhaka, Bangladesh
[2] Natl Univ Singapore, Dept Elect & Comp Engn, 4 Engn Dr 3, Singapore 117548, Singapore
[3] Univ S Carolina, Dept Elect Engn, Columbia, SC 29208 USA
关键词
PHONON POLARITONS; LAYER GRAPHENE; METAMATERIALS; ABSORBER;
D O I
10.1038/srep25442
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In this article, we have theoretically investigated the performance of graphene-hexagonal Boron Nitride (hBN) multilayer structure (hyper crystal) to demonstrate all angle negative refraction along with superior transmission. hBN, one of the latest natural hyperbolic materials, can be a very strong contender to form a hyper crystal with graphene due to its excellence as a graphene-compatible substrate. Although bare hBN can exhibit negative refraction, the transmission is generally low due to its high reflectivity. Whereas due to graphene's 2D nature and metallic characteristics in the frequency range where hBN behaves as a type-I hyperbolic material, we have found graphene-hBN hyper-crystals to exhibit all angle negative refraction with superior transmission. Interestingly, superior transmission from the whole structure can be fully controlled by the tunability of graphene without hampering the negative refraction originated mainly from hBN. We have also presented an effective medium description of the hyper crystal in the low-k limit and validated the proposed theory analytically and with full wave simulations. Along with the current extensive research on hybridization of graphene plasmon polaritons with (hyperbolic) hBN phonon polaritons, this work might have some substantial impact on this field of research and can be very useful in applications such as hyper-lensing.
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页数:11
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