scholarly journals Dual-band unidirectional reflectionless phenomena in an ultracompact non-Hermitian plasmonic waveguide system based on near-field coupling

2017 ◽  
Vol 25 (20) ◽  
pp. 24281 ◽  
Author(s):  
Cong Zhang ◽  
Ruiping Bai ◽  
Xintong Gu ◽  
Xing Ri Jin ◽  
Ying Qiao Zhang ◽  
...  
Keyword(s):  
Near Field ◽  
Plasmonic Waveguide ◽  
Dual Band ◽  
Field Coupling ◽  
Waveguide System

Terahertz multi-band unidirectional reflectionless phenomenon in a MIM plasmonic waveguide system based on near-field coupling

2019 ◽  
Vol 28 (01) ◽  
pp. 1950008 ◽  
Author(s):  
Tianyi Dai ◽  
Fei Zhao ◽  
Cong Zhang ◽  
Xing Ri Jin ◽  
Ying Qiao Zhang ◽  
...  
Keyword(s):  
Near Field ◽  
Plasmonic Waveguide ◽  
Dual Band ◽  
Metal Insulator ◽  
Exceptional Points ◽  
Field Coupling ◽  
Metal Insulator Metal ◽  
Waveguide System ◽  
Multi Band

Dual-band unidirectional reflectionlessness is investigated in a system consisting of three stub resonators side-coupled to a metal-insulator-metal plasmonic waveguide based on near-field coupling in terahertz domain. Reflectivities of [Formula: see text] and [Formula: see text], respectively, at two exceptional points 4.11[Formula: see text]THz and 4.695[Formula: see text]THz are obtained for forward (backward) direction. More than that multi-band unidirectional reflectionlessness is demonstrated based on multi-stub resonators side-coupled to an MIM plasmonic waveguide.

Dual-band unidirectional reflectionlessness at exceptional points in a plasmonic waveguide system based on near-field coupling between two resonators

2018 ◽  
Vol 30 (4) ◽  
pp. 045205 ◽  
Author(s):  
Fei Zhao ◽  
Tianyi Dai ◽  
Cong Zhang ◽  
Ruiping Bai ◽  
Ying Qiao Zhang ◽  
...  
Keyword(s):  
Near Field ◽  
Plasmonic Waveguide ◽  
Dual Band ◽  
Exceptional Points ◽  
Field Coupling ◽  
Waveguide System

scholarly journals Graphene-Modulated Terahertz Metasurfaces for Selective and Active Control of Dual-Band Electromagnetic Induced Reflection (EIR) Windows

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2420
Author(s):  
Xunjun He ◽  
Chenguang Sun ◽  
Yue Wang ◽  
Guangjun Lu ◽  
Jiuxing Jiang ◽  
...  
Keyword(s):  
Active Control ◽  
Slow Light ◽  
Near Field ◽  
Dual Band ◽  
Destructive Interference ◽  
Dark Mode ◽  
Field Coupling ◽  
Control Scheme ◽  
Electrostatic Doping ◽  
Induced Transparency

Currently, metasurfaces (MSs) integrating with different active materials have been widely explored to actively manipulate the resonance intensity of multi-band electromagnetic induced transparency (EIT) windows. Unfortunately, these hybrid MSs can only realize the global control of multi-EIT windows rather than selective control. Here, a graphene-functionalized complementary terahertz MS, composed of a dipole slot and two graphene-integrated quadrupole slots with different sizes, is proposed to execute selective and active control of dual-band electromagnetic induced reflection (EIR) windows. In this structure, dual-band EIR windows arise from the destructive interference caused by the near field coupling between the bright dipole slot and dark quadrupole slot. By embedding graphene ribbons beneath two quadrupole slots, the resonance intensity of two windows can be selectively and actively modulated by adjusting Fermi energy of the corresponding graphene ribbons via electrostatic doping. The theoretical model and field distributions demonstrate that the active tuning behavior can be ascribed to the change in the damper factor of the corresponding dark mode. In addition, the active control of the group delay is further investigated to develop compact slow light devices. Therefore, the selective and active control scheme introduced here can offer new opportunities and platforms for designing multifunctional terahertz devices.

Ultra-broadband unidirectional launching of surface plasmon polaritons by a double-slit structure beyond the diffraction limit

Nanoscale ◽  
2014 ◽  
Vol 6 (22) ◽  
pp. 13487-13493 ◽  
Author(s):  
Jianjun Chen ◽  
Chengwei Sun ◽  
Hongyun Li ◽  
Qihuang Gong
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Near Field ◽  
Diffraction Limit ◽  
Plasmonic Waveguide ◽  
Plasmon Polaritons ◽  
Double Slit

Based on the near-field interference of two slit apertures in a subwavelength plasmonic waveguide, an ultra-broadband unidirectional SPP launcher beyond the diffraction limit was experimentally realized. This ultra-small SPP launcher has important applications in high-integration plasmonic circuits.

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