Multi-frequency and wide-angle nonreciprocity arising from non-uniform magnetic field

被引：1

作者：

Wang, Jin ^{[1
]}

Fung, Kin Hung ^{[2
]}

Dong, Hui Yuan ^{[3
]}

Dong, Zheng-Gao ^{[1
]}

机构：

[1] Southeast Univ, Sch Phys, Key Lab Quantum Mat & Devices, Minist Educ, Nanjing 211189, Peoples R China

[2] Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Peoples R China

[3] Nanjing Univ Posts & Telecommun, Sch Sci, Nanjing 210003, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2023年 / 123卷 / 17期

基金：

中国国家自然科学基金;

关键词：

OPTICAL ISOLATION; SCATTERING; SUPERABSORPTION; SYMMETRY; LIGHT;

D O I：

10.1063/5.0174704

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigate the effect of non-uniform external static magnetic field on the scattering nonreciprocity of a deep-subwavelength gyrotropic particle system. Based on a scattering matrix approach, we show analytically that asymmetrical extinction cross section of the scattering system for opposite illumination directions can be accessed at multi-frequency and wide-angle regimes, in the presence of magnetic field with weak spatial non-uniformity. A simplified dual-dipole model is further employed to capture the generic physics of nonreciprocal scattering, essentially attributed to the asymmetrical magneto-electric cross interactions. In addition, typical examples are provided with full-wave numerical verifications. Our finding may open a straightforward and efficient pathway to manipulate nonreciprocal scattering at the subwavelength scale.

引用

页数：6

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