CAREER: Graphene-hexagonal Boron Nitride (hBN) Heterostructure Infrared Polaritonic Devices

事业：石墨烯六方氮化硼 (hBN) 异质结构红外极化器件

• 批准号: 1552461
• 负责人: Fengnian Xia
• 金额: $ 50万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-02-01 至 2022-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1552461&HistoricalAwards=false
• 关键词: CAREER; Graphene; hexagonal; Boron; Nitride

Abstract Title: Infrared Devices using Graphene-hexagonal Boron Nitride Layered HeterostructuresNontechnical description:Infrared devices covering a wavelength range from 6 to 15 microns can play a critical role in many optical technologies such as thermal imaging, night vision and free-space optical communications. The most commonly used material for the access to this infrared window is mercury cadmium telluride. However, the growth of mercury cadmium telluride involves toxic elements and hence is highly challenging. Moreover, it is soft and brittle, leading to difficulties in device fabrication and system integration. In this program, the principle investigator and his team will explore an alternative material system based on layered graphene-hexagonal boron nitride heterostructures for the infrared device applications. They will focus on the interaction of infrared light and the heterostructures and optimize their infrared properties. Furthermore, the team will built infrared devices which can perform infrared light detection functions in the wavelength range from 6 to 15 microns. This program will also train students and postdocs and hence contribute to the nation's workforce needs in optics and semiconductor industries. The program will provide students with unique hands-on research training in a rapidly emerging field, while exposing them to multidisciplinary research approaches. In collaboration with Yale Pathways to Science, this program will also educate pre-college students in New Haven area from diverse backgrounds and ethnicities especially under-represented groups, instilling their interests in science and engineering.Technical description: Polaritons are quasiparticles resulting from the coupling of photons with electric dipole-carrying elementary excitations such as plasmons, phonons, or excitons. Here the principle investigator and his team will explore graphene based infrared polaritonic devices covering an important mid-infrared wavelength range from 6 to 15 µm. They will investigate plasmon, phonon, and plasmon-phonon polaritons in large area hybrid structures consisting of graphene and hexagonal born nitride (hBN). The overall goals are to achieve unprecedented light-matter interaction and to realize high performance polaritonic imaging elements in the infrared. The key element of this proposal is the enhanced light-graphene interaction using polaritonic resonances. The principle investigator proposes two complementary thrusts: (1) Understand the plasmon, phonon, and plasmon-phonon polaritons and their damping processes in graphene-hBN heterostructures and build polaritonic photodetectors in mid-infrared (6 to 15 µm) based on lateral nanoribbon junctions; and (2) Understand the hot-carrier dominated thermionic emission effect in vertical heterostructures and build polariton enhanced photodetectors utilizing hot-carrier thermionic emission. The proposed research will lead to new optical devices based on an alternative material system. Systematic study on plasmon, phonon, and plasmon-phonon polaritons including their damping pathways will lead to discoveries of new optical physics in two-dimensional layered materials.

摘要标题：非技术性描述：波长范围为6至15微米的红外器件在许多光学技术中起着关键作用，如热成像、夜视和自由空间光通信。最常用的红外窗口材料是碲镉汞。然而，碲镉汞的生长涉及有毒元素，因此极具挑战性。此外，它又软又脆，导致器件制造和系统集成困难。在这个项目中，主要研究者和他的团队将探索一种基于层状石墨烯-六方氮化硼异质结构的替代材料系统，用于红外器件应用。他们将专注于红外光和异质结构的相互作用，并优化其红外特性。此外，该团队将建造红外设备，可以在6至15微米的波长范围内执行红外光探测功能。该计划还将培训学生和博士后，从而为国家在光学和半导体行业的劳动力需求做出贡献。该计划将为学生提供独特的动手研究培训，在一个迅速崛起的领域，同时让他们接触到多学科的研究方法。与耶鲁大学科学之路合作，该项目还将教育来自不同背景和种族的纽黑文地区的大学预科学生，特别是代表性不足的群体，灌输他们对科学和工程的兴趣。技术描述：极化激元是光子与携带电偶极的基本激发（如等离子体激元，声子或激子）耦合产生的准粒子。在这里，主要研究者和他的团队将探索基于石墨烯的红外极化激元器件，覆盖6至15 μm的重要中红外波长范围。他们将研究由石墨烯和六方氮化硼（hBN）组成的大面积混合结构中的等离子体激元，声子和等离子体激元-声子极化激元。总体目标是实现前所未有的光-物质相互作用，并在红外实现高性能的极化激元成像元件。该提议的关键要素是使用极化激元共振增强光-石墨烯相互作用。主要研究者提出了两个互补的方向：（1）理解石墨烯-hBN异质结构中的等离子体激元、声子和等离子体激元-声子极化激元及其阻尼过程，并在中红外波段构建极化激元光电探测器。（6至15微米）基于横向纳米晶结;（2）理解垂直异质结中热载流子主导的电子发射效应，并利用热载流子的电子发射效应构建极化激元增强型光电探测器。载流子电子发射拟议的研究将导致基于替代材料系统的新光学器件。对等离子体激元、声子、等离子体激元-声子极化激元及其阻尼路径的系统研究将有助于发现二维层状材料中新的光学物理。