Graphene-based electrically reconfigurable THz aperture arrays for imaging applications

目的：设计并研制一种基于室温石墨烯的太赫兹可重构孔径阵列，实现基于压缩传感的视频率太赫兹成像。该装置很好地解决了实现太赫兹调制的长期难题。通过静电调节一对电容耦合石墨烯中的费米能级，可以将THz的透射率从90%调到10%，从而为制造高速、高分辨率、高信噪比和低成本的THz成像器指明了方向。智慧的优点：石墨烯中的带内跃迁实现了THz调制，这是石墨烯除了透明导体和倍频器之外的另一个有吸引力的实际应用。我们还将回答关于石墨烯/半导体异质结中能带排列的问题。大面积石墨烯的制备和钝化以及石墨烯和金属超材料结构中的电磁相互作用。广泛的影响：基于石墨烯的高速和高效的THz调制器引起了THz和石墨烯社区的极大兴趣。研究生将接受太赫兹和纳米材料新兴领域的培训，他们也是旨在向包括本科生、学校教师和K-12学生在内的广大受众传播新发现的宣传活动的一个组成部分。

Objective: we aim to design and develop a room temperature graphene-based THz reconfigurable aperture array to realize video-rate THz imaging based on compressive sensing. The proposed device promises an elegant solution to the long standing problem in realizing THz modulation. By electrostatically tuning the Fermi level in a pair of capacitively coupled graphene sheets, the THz transmission intensity can be tuned from 90% to 10%, thus pointing ways to fabricate high speed, high resolution, high signal-to-noise ratio and low-cost THz imagers.Intellectual Merit: THz modulation enabled by intraband transitions in graphene, is another attractive real-world application of graphene besides transparent conductors and frequency multipliers etc. We will also answer questions regarding energy band alignment in graphene/semiconductor heterojunctions, large-area graphene preparation and passivation and electromagnetic interactions in metematerial structures made of graphene and metal.Broader Impact: The high-speed and efficient THz modulators based on graphene are of immense interest to both the THz and graphene community. Graduate students will be trained in the emergent fields of THz and nanomaterials and they are also an integral element of the designed outreach activities to disseminate the new discoveries to the general audience including undergraduate students, school teachers and K-12 students.