二维黑磷对太赫兹波调控特性的理论研究

宋克超; 霍帅楠; 涂冬明; 侯新富; 吴晓静; 王明伟

doi:10.7498/aps.69.20200105

摘要

根据Drude模型在理论上计算了太赫兹(THz)波段二维黑磷(2D BP)在扶手椅方向(X )和锯齿方向(Y )上电导率随频率的色散及吸收. 发现2D BP在X和Y两个方向上电导率不同, 从而导致了其介电常数的不同, 进而可以对不同偏振方向的THz波起到不同的调制作用. 利用2D BP对THz波具有偏振依赖的特性, 设计了2D BP-SiO₂三明治周期结构, 通过三维电磁场仿真软件CST Microwave Studio计算了这种结构对THz波的调控特性, 研究发现, 这种结构对不同偏振方向入射的THz波有不同的吸收; 改变结构中底层SiO₂层的厚度, 结构的吸收率也发生了相应的变化. 基于此, 研究提出了这种结构对偏振平行于2D BP扶手椅方向和锯齿方向的THz脉冲有最大吸收率差时的底层SiO₂层厚度. 结果表明这种结构可以用于设计新型结构紧凑的THz吸收器和偏振器.

关键词:

黑磷 /
偏振 /
太赫兹

Abstract

Using the Delude model. we theoretically calculate the dispersion of conductivity with frequency in the orthogonal direction of the two-dimensional black phosphorus (2D BP) x and y direction in the THz band. We find that the conductivity in the x direction is more sensitive to the electron doping concentration. The difference between 2D BP conductivities in both directions leads to the difference in dielectric constant which in turn can modulate light in different polarization directions. Using 2D BP to polarize the THz wave, the 2D BP-SiO₂ periodic sandwich structure is designed. The three-dimensional electromagnetic field simulation software CST Microwave Studio can be used to calculate the regulation characteristics of this structure to THz wave. It is found that this structure has different polarization directions, and the incident THz wave has different absorption. By changing the thickness of the underlying SiO₂ layer in the structure it is found that the absorption rate of this structure also changes accordingly. When the polarization direction of the THz pulse is parallel to the x axis, the absorption rate first increases and then decreases. When d₅ = 9.5 μm, the absorption rate reaches 93% near 3.86 THz; when the polarization direction of the THz pulse is parallel to the y axis, the absorption rate gradually increases. The absorption peak has a significant red shift.

Keywords:

black phosphorus /
polarization /
THz

作者及机构信息

1.
南开大学电子信息与光学工程学院, 天津　300350

2.
南开大学附属人民医院, 生物医学与纳米光子学实验室, 天津　300121

通信作者: 王明伟, wangmingwei@nankai.edu.cn

Authors and contacts

1.
College of Electronic Information and Optical Engineering, Nankai University, Tianjing 300350, China

2.
Nankai University Affiliated Hospital, Laboratory of Biomedicine and Nanophotonics, Tianjin 300121, China

Corresponding author: Wang Ming-Wei, wangmingwei@nankai.edu.cn

文章全文 : translate this paragraph

参考文献

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施引文献

图 1 单层BP结构示意图

Fig. 1. Schematic diagram of single-layer BP structure.

下载: 全尺寸图片幻灯片

图 2 2D BP的电导率色散曲线　(a)电导率的实部; (b)电导率的虚部

Fig. 2. Conductivity dispersion curve for two-dimensional BP: (a) The real part of the conductivity; (b) the imaginary part of the conductivity.

下载: 全尺寸图片幻灯片

图 3 2D BP-SiO₂三明治周期结构示意图

Fig. 3. Schematic diagram of 2D BP-SiO₂ sandwich structure

下载: 全尺寸图片幻灯片

图 4 在不同厚度的底层SiO₂下, 2D BP-SiO₂三明治周期结构的吸收率

Fig. 4. Absorptivity of a 2D BP-SiO₂ sandwich periodic structure with different thicknesses of the underlying SiO₂.

下载: 全尺寸图片幻灯片

图 5 在不同厚度的底层SiO₂下, 2D BP-SiO₂三明治周期结构在X和Y两个方向的吸收率差随频率的变化

Fig. 5. Absorption rate difference of 2D BP-SiO₂ sandwich periodic structure in two directions of X and Y under different thicknesses of SiO₂.

下载: 全尺寸图片幻灯片

[1]	Asahina H, Shindo K, Morita A 1982 Phys. Soc. Jpn. 51 1193 Google Scholar
[2]	Viti L, Hu J, Coquillat D, et al. 2015 Adv. Mater. 27 5567 Google Scholar
[3]	Bridgman P 1914 JACS 36 1344 Google Scholar
[4]	Li S, Zhang Y, Wen W, et al. 2019 Biosens. Bioelectron. 133 223 Google Scholar
[5]	Zhao J, Zhu J, Cao R 2019 Nat. Commun. 10 4062 Google Scholar
[6]	Bolognesi M, Brucale M, Lorenzoni A, et al. 2019 Nat. Nanotechnol. 11 17252 Google Scholar
[7]	Izquierdo N, Myers Jason C, Seaton Nicholas C A 2019 ACS Nano 13 7091 Google Scholar
[8]	Wang J, Jiang Y, Hu Z 2017 Opt. Express 25 22149 Google Scholar
[9]	Jimin K, Seung S B, Sung W J 2017 Phys. Rev. Lett. 119 226801 Google Scholar
[10]	Liu X, Lee M A, Sungjo P 2019 ACS Appl. Mater. Inter. 11 23558 Google Scholar
[11]	Li L, Yang F, Ye G J 2016 Nat. Nanotechnol. 10 593 Google Scholar
[12]	Liu X, Wood Joshua D, Chen K 2015 J. Phys. Chem. Lett. 9 773 Google Scholar
[13]	Wang H, Zhang X, Xie Y 2018 ACS Nano 12 9648 Google Scholar
[14]	Favron A, Gaufrès E, Fossard F, et al. 2015 Nat. Mater. 14 826 Google Scholar
[15]	Ling X, Wang H, Huang S, et al. 2015 PNAS 112 4523 Google Scholar
[16]	Wang X, Jones A M, Seyler K L 2015 Nat. Nanotechnol. 10 517 Google Scholar
[17]	Low T, Roldán R, Wang H, et al. 2014 Phys. Rev. Lett. 113 106802 Google Scholar
[18]	Naftaly M, Miles R E 2007 Proc. IEEE 95 1658 Google Scholar
[19]	Rodin A, Carvalho A, Neto A C S 2014 Phys. Rev. Lett. 112 176801 Google Scholar

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二维黑磷对太赫兹波调控特性的理论研究