Stopping surface magneto-plasmons by non-reciprocal graded waveguides

• Published in: Physics letters. A Vol. 398; p. 127279
• Main Authors: Wang, Jin, Shi, Qian Yi, Liu, Ya Jie, Dong, Hui Yuan, Fung, Kin Hung, Dong, Zheng-Gao
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 17.05.2021
• Subjects: Magneto-optical materials; Planar waveguides; Surface plasmons; Surface plasmons; Magneto-optical materials; Planar waveguides
• ISSN: 0375-9601; 1873-2429
• DOI: 10.1016/j.physleta.2021.127279

•Stop light by non-reciprocal graded waveguides.•Manipulate the stopped locations by the external static magnetic field.•An effective method for fast modulation on energy concentration. We present that the guided surface magneto-plasmons (SMPs) can be finely tailored and truely stopped at specific location in a class of non-reciprocal graded waveguide system. By examining the dispersion properties of SMPs, the one-way propagating wave stops eventually at the band edge in the proposed waveguide system, where the group velocity vanishes. Meanwhile, the stopped location can be readily tuned by an external static magnetic field. Numerical calculations on the group velocity of propagating SMPs and the spatial field distribution are employed to verify the formation of hotspots. The impact of intrinsic absorption as well as fabrication disorder involved in the realistic waveguide structure is also investigated. The results may suggest an effective method for fast modulation on wave harvesting and energy concentration through external magnetic field.