A tunable broadband microwave absorber based on coherent population trapping. (16th July 2020)

• Record Type: Journal Article
• Authors: Yang, Aihong; Liang, Min; Jia, Zhengmao; Liu, Shande; Xu, Yan; Peng, Yandong
• Is Part Of: Laser physics. Volume 30:Number 9(2020)
• Publication Date: 2020-07-16
• Subjects: microwave absorption -- electromagnetically induced transparency -- coherent population trapping -- Rydberg atom; Lasers -- Periodicals; 621.36605
• DOI: 10.1088/1555-6611/ab9d74
• Languages: English
• ISSNs: 1054-660X

Abstract

Abstract: A scheme is proposed for a tunable broadband microwave absorber using a four-level Rydberg atom system with competition between electromagnetically induced transparency (EIT) and coherent population trapping (CPT). Two laser fields drive the Rydberg atoms from the ground state to a Rydberg state, forming a cascade-type EIT/CPT system. When a microwave (MW) field couples the Rydberg transition, a strong MW absorption peak appears. A narrow band MW absorber could be obtained via EIT, however, using CPT, the MW absorption spectrum can be significantly broadened and enhanced to have a bandwidth about ten times larger than that obtained with EIT and whose peak value can also be enhanced by a factor of ten, based on simulation.