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Ultralight Angstrom-Scale Optimal Optical Reflectors
ACS Photonics ( IF 7 ) Pub Date : 2017-11-09 00:00:00 , DOI: 10.1021/acsphotonics.7b00609
Georgia T. Papadakis 1 , Prineha Narang 2 , Ravishankar Sundararaman 3 , Nicholas Rivera 4 , Hrvoje Buljan 5 , Nader Engheta 6 , Marin Soljačić 4
Affiliation  

High reflectance in many state-of-the-art optical devices is achieved with noble metals. However, metals are limited by losses and, for certain applications, by their high mass density. Using a combination of ab initio and optical transfer matrix calculations, we evaluate the behavior of graphene-based angstrom-scale metamaterials and find that they could act as nearly perfect reflectors in the mid–long-wave infrared (IR) range. The low density of states for electron–phonon scattering and interband excitations leads to unprecedented optical properties for graphene heterostructures, especially alternating atomic layers of graphene and hexagonal boron nitride, at wavelengths greater than 10 μm. At these wavelengths, these materials exhibit reflectivities exceeding 99.7% at a fraction of the weight of noble metals, as well as plasmonic mode confinement and quality factors that are greater by an order of magnitude compared to noble metals. These findings hold promise for ultracompact optical components and waveguides for mid-IR applications. Moreover, unlike metals, the photonic properties of these heterostructures could be actively tuned via chemical and/or electrostatic doping, providing exciting possibilities for tunable devices.

中文翻译:

超轻埃级最佳光学反射镜

使用贵金属可以在许多最先进的光学设备中实现高反射率。但是,金属受到损耗的限制,在某些应用中还受到其高密度的限制。使用从头算起的组合以及光学传递矩阵计算,我们评估了基于石墨烯的埃级超材料的行为,发现它们可以在中长波红外(IR)范围内充当近乎完美的反射器。电子-声子散射和带间激发的低态密度导致了石墨烯异质结构(尤其是石墨烯和六方氮化硼的交替原子层)在大于10μm的波长下具有空前的光学特性。在这些波长下,这些材料在贵金属重量的一小部分处显示出超过99.7%的反射率,并且与贵金属相比,等离子波模式限制和品质因数大一个数量级。这些发现为用于中红外应用的超紧凑型光学组件和波导提供了希望。而且,与金属不同,
更新日期:2017-11-09
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