Controlled exciton–plasmon coupling in a mixture of ultrathin periodically aligned single-wall carbon nanotube arrays
Controlled exciton–plasmon coupling in a mixture of ultrathin periodically aligned single-wall carbon nanotube arrays
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DOI：
10.1063/5.0031212
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发表时间：
2020-09
期刊：
影响因子：
--
通讯作者：
C. Adhikari;I. Bondarev
中科院分区：
文献类型：
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作者：
C. Adhikari;I. Bondarev
我们从理论上研究了实验上可行的碳纳米管 (CN) 薄膜系统的面内电磁响应和激子-等离子体相互作用，该系统由嵌入超薄有限厚度电介质中的平行排列的周期性半导体 CN 阵列组成。对于均匀的单 CN 薄膜，管间耦合和热展宽使激子和带间等离子体共振更加接近。由于由具有轻微 CN 直径分布的阵列混合物组成的薄膜的不均匀展宽，它们甚至可以重叠。在此类系统中，响应函数的实部对于较宽的能量范围（负折射带）为负，并且 CN 薄膜表现为双曲超材料。我们还表明，对于正确制造的双组分 CN 薄膜，通过改变两个组成 CN 阵列组件的相对重量，可以调整光学吸收剖面，使薄膜按需透射或吸收激子吸收共振附近的光。
We study theoretically the in-plane electromagnetic response and the exciton-plasmon interactions for an experimentally feasible carbon nanotube (CN) film systems composed of parallel aligned periodic semiconducting CN arrays embedded in an ultrathin finite-thickness dielectric. For homogeneous single-CN films, the intertube coupling and thermal broadening bring the exciton and interband plasmon resonances closer together. They can even overlap due to the inhomogeneous broadening for films composed of array mixtures with a slight CN diameter distribution. In such systems the real part of the response function is negative for a broad range of energies (negative refraction band), and the CN film behaves as a hyperbolic metamaterial. We also show that for a properly fabricated two-component CN film, by varying the relative weights of the two constituent CN array components one can tune the optical absorption profile to make the film transmit or absorb light in the neighborhood of an exciton absorption resonance on-demand.