Unravelling the terahertz electronic properties of graphene for applications in optoelectronics

揭示石墨烯的太赫兹电子特性在光电子学中的应用

• 批准号: 494029-2016
• 负责人: Ozaki, Tsuneyuki
• 金额: $ 13.15万
• 依托单位: Institut national de la recherche scientifique
• 依托单位国家: 加拿大
• 项目类别: Strategic Projects - Group
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=642019
• 关键词: Unravelling; terahertz; electronic; properties; graphene

Graphene is a monolayer of carbon atoms covalently bound in a hexagonal honeycomb lattice structure. The excitement around graphene stems from its unique mechanical, optical and electronic properties, and significant innovative applications of graphene have been proposed, such as high-sensitivity sensors, nano-electronics, high-speed optoelectronics and photodetection. However, such exceptional properties of graphene are also a double-edged sword, allowing its characteristics to easily change due to various factors. As such, synthesizing graphene with the desired characteristics remains very challenging, especially for more complex cases like bilayer graphene and graphene composites. Upgrading such techniques and optimizing them to the industrial level would undoubtedly be laborious and inefficient. Clearly, a non-contact, non-destructive technique to characterize graphene (such as its electronic properties) could provide means to tweak the synthesizing process, allowing one to efficiently find the right recipe. To this end, we propose in this Strategic project to use nonlinear terahertz (THz) spectroscopy for non-contact, non-destructive characterization of the THz electronic properties of various graphene samples. Due to its low photon energy, THz radiation is ideal to pump and probe carriers in a bandless material like graphene. Nonlinear THz spectroscopy is a new technique that studies the behaviour of materials under intense THz irradiation. In this project, we will work with two Canadian companies to fabricate and characterize various types of graphene samples, and with the support of theoretical modelling, gain better understanding of the THz electronic properties of graphene. Based on this new knowledge, we will also address possible applications of graphene to future devices.

石墨烯是在六角蜂窝晶格结构中共价结合的碳原子的单层。石墨烯周围的兴奋源于其独特的机械，光学和电子性能以及石墨烯的重要创新应用，例如高敏感性传感器，纳米电子，高速光电子和光检测。但是，石墨烯的这种特殊特性也是一把双刃剑，因此由于各种因素，其特性可以轻松改变。因此，具有所需特性的合成石墨烯仍然非常具有挑战性，尤其是对于更复杂的案例，例如双层石墨烯和石墨烯复合材料。升级此类技术并将其优化到工业水平，无疑是费力且效率低下的。显然，一种表征石墨烯（例如其电子特性）的非接触，非破坏性技术可以提供调整合成过程的方法，从而使人们有效地找到正确的食谱。为此，我们建议在这个战略项目中使用非线性Terahertz（THZ）光谱法来对各种石墨烯样品的THZ电子性质的非接触式，非破坏性表征。由于其低光子能量，THZ辐射是在像石墨烯之类的无带材料中泵送和探测载体的理想选择。非线性THZ光谱是一种新技术，可研究在强烈的THZ照射下的材料行为。在这个项目中，我们将与两家加拿大公司合作制造和表征各种类型的石墨烯样品，并在理论建模的支持下，更好地了解石墨烯的THZ电子性质。基于这些新知识，我们还将解决石墨烯对未来设备的可能应用。