Plasmonic Feynman Gate Based on Suspended Graphene Nano-Ribbon Waveguides at THz Wavelengths

Abstract

In this paper, a plasmonic Feynman gate based on suspended graphene nanoribbon waveguides at THz wavelengths is proposed and numerically investigated. The proposed plasmonic Feynman gate is composed of two cascaded microring resonators. The resonant states of microring resonators are flexibly controlled by tuning chemical potentials of graphene in rings, and thus, the logic operation results of Feynman gate can be performed successfully. Compared to the plasmonic Feynman gate based on graphene nano-ribbons deposited on the Si substrate and the plasmonic Feynman gate based on graphene nanoribbons deposited on the SiO 2 /Si substrate, our designed plasmonic Feynman gate can have better extinction ratio and crosstalk. Calculation results exhibit that the extinction ratio is larger than 15.39 dB and the crosstalk is lower than −15.55 dB when input logic states of our designed device are '00', '01', '10,' and '11'.

Suspended 2D Materials: A Short Review

“…Suspended 2D materials offer significant potential for a diverse range of applications due to their ultra-thin nature, high strength, high conductivity, and high transparency. One prominent application lies in electronic devices, including FETs [41,60,61], logic gates [62,63], photodetectors [64][65][66][67][68], resonators [69][70][71][72], and sensors [73][74][75][76][77][78]. For instance, Han et al demonstrated that incorporating piezoresistive properties in suspended graphene membranes enhances sensitivity and expands the temperature-sensing range in nanoelectromechanical system (NEMS) temperature sensors [129].…”

“…Ongoing investigation into the properties and characteristics of 2D materials is expected to lead to Additionally, suspended 2D materials exhibit great potential within the of logic gates. Wang et al [62] introduced a plasmonic Feynman gate leveraging suspended graphene nano-ribbon waveguides. In comparison to the plasmonic Fermi gate grounded on a substrate, the plasmonic Fermi gate constructed upon a suspended architecture affords superior performance in terms of extinction ratio and crosstalk mitigation, which furnishes valuable insights in the logic circuits.…”

“…We offer insights into suspended configurations' experimental techniques, advantages, and limitations. The findings presented here will serve as a valuable resource for researchers aiming to harness the full potential of 2D materials in various applications, including FETs [41,60,61], logic gates [62,63], photodetectors [64][65][66][67][68], resonators [69][70][71][72], and sensors [73][74][75][76][77][78].…”

Low-Loss Graphene Waveguide Modulator for Mid-Infrared Waves

“…Meanwhile, graphene's optical and electrical properties can be easily tuned by bias voltage. Therefore, people can manually control the status of modulator based on graphene switch between on and off [10][11][12][13][14].…”