A graphene-based THz spectral active control

DU Liangliang; LI Quan; LI Shaoxian; HU Fangrong; XIONG Xianming; ZHANG Wentao; HAN Jiaguang

doi:10.11889/j.0253-3219.2015.hjs.38.120502

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A graphene-based THz spectral active control

更新时间：2021-03-03

- A graphene-based THz spectral active control
- NUCLEAR TECHNIQUES Vol. 38, Issue 12, Article number: 120502(2015)
- 作者机构：
  
  1. 桂林电子科技大学电子工程与自动化学院,桂林,541000
  2. 天津大学太赫兹波研究中心精密仪器与光电子工程学院,天津,300072
  3. 广西高校光电信息处理重点实验室,桂林,541000
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.120502
  CLC：
- Published：15 December 2015
- 稿件说明：
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DU Liangliang, LI Quan, LI Shaoxian, et al. A graphene-based THz spectral active control[J]. Nuclear techniques, 2015, 38(12): 120502
DOI：

DU Liangliang, LI Quan, LI Shaoxian, et al. A graphene-based THz spectral active control[J]. Nuclear techniques, 2015, 38(12): 120502 DOI： 10.11889/j.0253-3219.2015.hjs.38.120502.

摘要

石墨烯是目前已知的理想二维薄膜，具有独特的能带结构，表现出优异的电学、光学特性和良好的兼容性。同时面对石墨烯的带内跃迁恰好与太赫兹频带相对应的独特优势，提出了一种石墨烯-硅复合结构对太赫兹的主动控制，并且实现对太赫兹传输的显著调制。本文主要采用太赫兹时域光谱技术对基于石墨烯复合结构进行深入的研究。实验揭示了在连续的蓝紫光泵浦条件下，复合结构太赫兹波的透射率随外加电压表现出双向大范围的变化，反射率却表现出单调的微弱变化的光谱特性。面对复合结构对太赫兹传输表现出的奇异特性，本文采用Kubo模型和肖特基结理论，指出了这一光谱变化与石墨烯和硅的电导率密切相关。

Abstract

Background: Graphene

a two-dimensional layer of carbon atoms forming a honeycomb crystal lattice

has attracted much attention for its extraordinary car?rier transport properties. The unique electronic structure of graphene gives rise to massless charge carriers and ballistic transport on a submicron scale at room temperature. Purpose: The tunable electrical properties realized by raising or lowering the Fermi level

allow excellent tunability of electromagnetic structures made of this material. Methods: We used terahertz time-domain analysis of the composite structure. Results: Here we demonstrate a significant amplitude modulation of THz waves with gated graphene by using extraordinary transmission through the graphene layer placed right above N-silicon substrate in the blue-violet laser of continuous irradiation. However

the reflection modulation of THz waves is weak monotonic. Conclusion: We employ the carrier transport properties of the graphene and the transport properties of the Schottky junction to analyze a graphene-silicon hybrid structure’s strange transmission reasonably.Cited

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