Tunable coherent perfect absorption in three-dimensional Dirac semimetal films

被引：4
作者：
Wu, Jipeng [1 ,2 ]
Tang, Jie [1 ]
Zeng, Rongzhou [2 ]
Dai, Xiaoyu [3 ]
Xiang, Yuanjiang [1 ]
机构：
[1] Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China
[2] Hunan Univ Technol, Coll Traff Engn, Zhuzhou 412007, Peoples R China
[3] Hunan Univ, Coll Elect & Informat Engn, Changsha 410082, Hunan, Peoples R China
来源：
CHINESE OPTICS LETTERS | 2021年 / 19卷 / 08期
基金：
中国国家自然科学基金;
关键词：
coherent perfect absorption; bulk Dirac semimetal; thin film; phase modulation; ABSORBER;
D O I：
10.3788/COL202119.081601
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this article, we investigate the phenomenon of coherent perfect absorption (CPA) with bulk Dirac semimetal (BDS) thin film. CPA of BDS appears at the frequency of 43.89 THz with 0 degrees phase modulation of two coherent input lights. Meanwhile, it shows that CPA can be realized under oblique incidence circumstances for both TM and TE polarizations. Moreover, the frequency of CPA can be adjusted by altering the thickness of BDS thin film, and the dynamic regulation of CPA can be realized by changing the Fermi energy. Finally, the peak coherent absorption frequency can be controlled by changing the degeneracy factor.
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页数：6
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