INVESTIGATION OF A NOVEL QUANTUM DOT TUNNEL DETECTOR FOR THE TERAHERTZ RANGE

太赫兹波段新型量子点隧道探测器的研究密歇根大学安娜堡分校巴塔查里亚分校提出的研究计划旨在研究一种适用于太赫兹波段的新型高温量子点探测器。在该器件中，暗电流和光电流的传输路径通过与每个量子点吸收层相邻的双势垒共振隧穿异质结来解耦。太赫兹波段的光激发能与双势垒异质结的隧穿能一致。结果是，贡献光电流的载流子共振地隧穿了双势垒，而由能量分布较宽的载流子产生的暗电流被很大程度上阻止了。该设备还可以设计用于高温(=200K)操作。所提出的太赫兹探测器将由InAs/GaAs和InAs/InP自组织量子点设计和实现。该设备的完整模型将由分子束外延生长、制造和表征来补充。广泛的影响：拟议的计划将通过固有的多学科主题(材料科学、物理、电气工程、纳米光子学)和具体规划的努力，对教育和推广产生更广泛的影响。参与该项目的研究生和本科生将参与跨学科研究，为这些未来的科学家和工程师在跨学科领域的职业生涯做好准备。该项目纳入了具体的外联活动，旨在提供本科生研究机会，并鼓励小学生攻读科学和工程领域。

INVESTIGATION OF A NOVEL QUANTUM DOT TUNNEL DETECTOR FOR THE TERAHERTZ RANGE0620688Pallab BhattacharyaUniversity of Michigan Ann ArborIntellectual Merit: The proposed research program seeks to investigate a novel high-temperature quantum dot detector for the terahertz range of the spectrum. In this device, the transport paths of the dark current and photo current of the device are decoupled with a double-barrier resonant tunneling heterostructure adjoining each quantum dot absorbing layer. The photoexcitation energy in the terahertz is coincident with the tunneling energy of the double barrier heterostructure. As a result, carrier contributing to the photocurrent resonantly tunnel through the double barrier, while the dark current generated by carriers with a broad energy distribution is largely blocked. The device can also be designed for high temperature(= 200K) operations. The proposed terahertz detectors will be designed and realized with InAs/GaAs and InAs/InP self-organized quantum dots. A complete modeling of the device will be complemented by molecular beam epitaxy growth, fabrication and characterization.Broader Impact: The proposed program will have a broader impact on education and outreach through the inherent multidisciplinary topics (material science, physics, electrical engineering, nanophotonics) and specifically planned efforts. Graduate and undergraduate students participating in the project will participate in interdisciplinary research, preparing these future scientists and engineers for careers in interdisciplinary fields. Specific outreach activities are incorporated in this project aimed at providing undergraduate research opportunities and encouraging elementary school children to pursue science and engineering fields.