scholarly journals Dual-channel optical switch, refractive index sensor and slow light device based on a graphene metasurface

2020 ◽  
Vol 28 (23) ◽  
pp. 34079 ◽  
Author(s):  
Xinpeng Jiang ◽  
Dingbo Chen ◽  
Zhaojian Zhang ◽  
Jie Huang ◽  
Kui Wen ◽  
...  
Keyword(s):  
Refractive Index ◽  
Slow Light ◽  
Optical Switch ◽  
Refractive Index Sensor ◽  
Dual Channel

Tunable plasmonic-induced transparency based on stub-coupled cascade ring resonator with electro-optical material

2019 ◽  
Vol 33 (18) ◽  
pp. 1950206
Author(s):  
Fang Chen ◽  
Huafeng Zhang ◽  
Lihui Sun ◽  
Jijun Li ◽  
Chunchao Yu
Keyword(s):  
Slow Light ◽  
Ring Resonator ◽  
Optical Switch ◽  
Fdtd Method ◽  
Optical Material ◽  
Ring Resonators ◽  
Refractive Index Sensor ◽  
External Voltage ◽  
All Optical Switch ◽  
Induced Transparency

The electrical control of plasmonic-induced transparency (PIT) via a resonator waveguide system is presented. The proposed structure is composed of a stub and cascade ring resonator. The ring and the stub resonator are filled with electro-optical material which can control the resonance frequency by the external voltage. Two-dimensional finite difference time domain (2D FDTD) method is used to calculate the transmission and field distribution. Single PIT is investigated both by FDTD and Coupled Mode Theory (CMT). The proposed PIT can be tuned by changing the external voltage or the geometric parameters. Double and triple PIT can be obtained by introducing more ring resonators and can be tuned by external voltage. The proposed plasmonic structure may have application in slow light device, nanoscale filter, all-optical switch and refractive index sensor.

scholarly journals Double Spectral Electromagnetically Induced Transparency Based on Double-Bar Dielectric Grating and Its Sensor Application

2020 ◽  
Vol 10 (9) ◽  
pp. 3033 ◽  
Author(s):  
Guofeng Li ◽  
Junbo Yang ◽  
Zhaojian Zhang ◽  
Kui Wen ◽  
Yuyu Tao ◽  
...  
Keyword(s):  
Slow Light ◽  
Electromagnetically Induced Transparency ◽  
Structural Parameters ◽  
Refractive Index Sensor ◽  
Dual Mode ◽  
Dual Channel ◽  
Guided Mode ◽  
Dielectric Grating ◽  
Q Factors ◽  
Induced Transparency

The realization of the electromagnetically induced transparency (EIT) effect based on guided-mode resonance (GMR) has attracted a lot of attention. However, achieving the multispectral EIT effect in this way has not been studied. Here, we numerically realize a double EIT-ike effect with extremely high Q factors based on a GMR system with the double-bar dielectric grating structure, and the Q factors can reach 35,104 and 24,423, respectively. Moreover, the resonance wavelengths of the two EIT peaks can be flexibly controlled by changing the corresponding structural parameters. The figure of merit (FOM) of the dual-mode refractive index sensor based on this system can reach 571.88 and 587.42, respectively. Our work provides a novel method to achieve double EIT-like effects, which can be applied to the dual mode sensor, dual channel slow light and so on.

Liquid refractive index sensor based on slow light in slotted photonic crystal waveguide

Optik ◽  
2013 ◽  
Vol 124 (22) ◽  
pp. 5443-5446 ◽  
Author(s):  
Ya-nan Zhang ◽  
Yong Zhao ◽  
Qi Wang ◽  
Kai Xue
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Slow Light ◽  
Refractive Index Sensor ◽  
Photonic Crystal Waveguide

Plasmonic refractive index sensor with multi-channel Fano resonances based on MIM waveguides

2020 ◽  
Vol 34 (16) ◽  
pp. 2050173
Author(s):  
Yihong Fang ◽  
Kunhua Wen ◽  
Zhengfeng Li ◽  
Bingye Wu ◽  
Zicong Guo
Keyword(s):  
Refractive Index ◽  
Optical Filter ◽  
High Sensitivity ◽  
Refractive Index Sensor ◽  
Fano Resonances ◽  
Coupled Mode ◽  
Dual Channel ◽  
Metal Insulator Metal ◽  
Group Delays ◽  
Coupled Cavity

A multi-channel Fano resonant structure is proposed and analyzed based on subwavelength metal–insulator–metal (MIM) waveguides. First, two MIM output ports associated with specific side-coupled cavities are designed to locate at the center and quarter positions of an end-coupled cavity, respectively. Since the interference between the dark and bright modes, dual-channel Fano resonances with asymmetrical lines shapes are obtained at both ports, respectively. High sensitivity and figure of merits are investigated. Besides, phase shifts are also investigated leading to positive and negative group delays available at the Fano peaks and dips, respectively. Likewise, two extra output ports with identical resonant cavities are placed on the other side of the end-coupled cavity. In this case, four-channel Fano resonances with considerable performances are obtained. The proposed structure is analyzed by the coupled mode theory and the finite difference time domain method. It is believed this device can be used as a chip-scale refractive index sensor and optical filter.

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