Active control of surface plasmon polaritons with phase change materials

被引：1
|
作者：
Qi, Yuan-Zhen [1 ,2 ]
Jiang, Qiao [1 ,2 ]
Xiang, Hong [1 ,2 ]
Han, De-Zhuan [1 ,2 ]
机构：
[1] Chongqing Univ, Dept Phys, Chongqing 401331, Peoples R China
[2] Chongqing Univ, Chongqing Key Lab Strongly Coupled Phys, Chongqing 401331, Peoples R China
来源：
CHINESE PHYSICS B | 2023年 / 32卷 / 10期
关键词：
surface plasmon polaritons; phase change materials; direction control; non-diffractive; 42.25.Hz; 73.20.Mf; 73.40.Rw; 78.20.N-; NONVOLATILE; EXCITATION;
D O I：
10.1088/1674-1056/accd5a
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Active control of surface plasmon polaritons (SPPs) is highly desired for nanophotonics. Here we employ a phase change material Ge2Sb2Te5 (GST) to actively manipulate the propagating direction of SPPs at the telecom wavelength. By utilizing the phase transition-induced refractive index change of GST, coupled with interference effects, a nanoantenna pair containing GST is designed to realize switchable one-way launching of SPPs. Devices based on the nanoantenna pairs are proposed to manipulate SPPs, including the direction tuning of SPP beams, switchable SPP focusing, and switchable cosine-Gauss SPP beam generating. Our design can be employed in compact optical circuits and photonics integration.
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页数：5
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