Tunable Anderson localization in disorder graphene sheet arrays

Area of Science:

• Physics
• Materials Science
• Optoelectronics

Background:

• Coupled waveguide arrays are essential for optical signal processing.
• Graphene's unique electronic properties offer novel ways to control light propagation.
• Anderson localization is a phenomenon where waves become trapped due to disorder.

Purpose of the Study:

• To investigate Anderson localization in coupled monolayer graphene waveguide arrays (CMGWAs).
• To explore the influence of disorder in coupling strength on localization properties.
• To demonstrate the electric tunability of Anderson localization in CMGWAs.

Main Methods:

• Theoretical analysis of electromagnetic wave propagation in CMGWAs.
• Introduction of disorder in coupling strength between adjacent waveguides.
• Full vectorial simulations incorporating graphene's tunable surface conductivity.
• Analysis of Anderson localization modes in the strong coupling regime.

Main Results:

• Anderson localization was observed in CMGWAs with disordered coupling strengths.
• Statistical parameters of disordering coupling strength allow tailoring of Anderson localization modes.
• The strength of Anderson localization is controllable via applied gate voltage due to graphene's tunable conductivity.
• Observed phenomena extend beyond the predictions of coupled-mode theory.

Conclusions:

• Disorder-induced Anderson localization is a viable mechanism for controlling wave propagation in CMGWAs.
• Graphene's electric tunability provides a powerful method for manipulating Anderson localization.
• These findings offer new possibilities for designing advanced optical devices and controlling electromagnetic waves.