太赫兹辐射
石墨烯
等离子体子
圆二色性
吸收(声学)
圆极化
材料科学
光电子学
电场
光学
二色性
超材料
X射线磁圆二色性
磁圆二色性
物理
纳米技术
化学
量子力学
天文
谱线
结晶学
微带线
作者
Ubaid Ur Rahman Qureshi,Bin Hu,Munzza Ahmad,Abdul Jalal
出处
期刊:IEEE Photonics Technology Letters
[Institute of Electrical and Electronics Engineers]
日期:2023-12-15
卷期号:35 (24): 1375-1378
被引量:6
标识
DOI:10.1109/lpt.2023.3325890
摘要
Light absorption based on chiral metasurfaces in the terahertz (THz) region has garnered considerable attention as a prominent research focus, finding extensive applications in biological monitoring, analytical chemistry, plasmonic sensing, and communication. This letter introduces a graphene-enabled triple-band tunable chiral metasurface absorber demonstrating highly selective absorption for right-handed and left-handed circularly polarized light in the THz region. Particularly noteworthy is the substantial discrepancy in absorption efficiency observed under normal and oblique incidence, which is maximized under oblique incidence. This pronounced chiroptical effect arises from distinct plasmonic resonances induced by incident circularly polarized light with opposite spin states. Moreover, the circular dichroism (CD) strengths can be dynamically adjusted by modulating the chemical potential of graphene. Analyses involving electric field distribution and current distributions have been employed to elucidate the mechanism underlying spin-selective absorption. The proposed tunable chiral metasurface absorber features a straightforward and compact design, offering immense potential for various applications within the terahertz bands.
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