Graphene plasmons-assisted tunable non-specular effect for dimension-adjustable terahertz edge imaging

被引：0

作者：

Shi, Jian ^{[1
]}

Deng, Jing ^{[1
]}

Li, Jun ^{[2
,3
]}

Tang, Yanbin ^{[4
]}

Xu, Gangyun ^{[1
]}

Gu, Chao ^{[1
]}

Li, Cuicui ^{[1
]}

He, Yanliang ^{[1
]}

Wu, Jian ^{[5
]}

Yuan, Wen ^{[1
]}

Luo, Haimei ^{[1
]}

Wang, Xianping ^{[1
]}

机构：

[1] Jiangxi Normal Univ, Coll Phys & Commun Elect, Jiangxi Prov Key Lab Adv Elect Mat & Devices, Nanchang 330022, Peoples R China

[2] Jiangxi Normal Univ, Coll Sci & Technol, Dept Phys, Nanchang 330022, Peoples R China

[3] Sanchuan Wisdom Technol Co Ltd, Sanchuan Hydraul Ind Pk,Longgang Sect,Hitech Dev Z, Yingtan 335200, Peoples R China

[4] Jiangxi Inst Appl Sci & Technol, Nanchang 330100, Peoples R China

[5] Natl Univ Def Technol, Coll Adv Interdisciplinary Studies, Nanhu Laser Lab, Changsha 410073, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2025年 / 692卷

基金：

中国国家自然科学基金;

关键词：

Graphene plasmons; Non-specular effect; Dimension-adjustable; Terahertz edge imaging;

D O I：

10.1016/j.apsusc.2025.162737

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Non-specular effect (the lateral Goos-Ha<spacing diaeresis>nchen (GH) shift and the photonic spin Hall effect (PSHE) induced transverse shift) of a light beam reflected from an interface with refractive index gradient has empowered metrology applications and recently been extended to the edge imaging. The structure parameter variations can exert a significant influence on the prism (Ge)-graphene terahertz (THz) surface plasmon resonance, for instance, the increment of layer number leads to a rise in the minimum reflectivity of resonance dip, and the correspondingly rs , rp and partial derivative phi p,s/partial derivative theta are changed, which give rise to the tunable non-specular effect. In addition, we reveal a mechanism for dimension-adjustable and orientation-switchable spatial differential operation, namely whether 2D or 1D differential is achieved and which direction differential is emerged. Compared to the previous woks, our scheme can be applied to edge detection without the aid of a quarter wave plate to achieve twodimensional differential operations, because our results highly depending on the competition between the scale coefficients Cx and Cy, which are complex functions of these two shifts, and thus can be flexibly modulated via altering the Fermi energy or the incident polarization angle. Our differential scheme could have potential usage in the highly sensitive sensor and microscopic imaging.

引用

页数：7