Strain-Modulated Reconfigurable Optical Information Processing in Flexible Graphene/PDMS

Area of Science:

• Photonics and optoelectronics
• Materials science
• Nanotechnology

Background:

• All-optical information processing is crucial for future communication and computing.
• Graphene offers excellent nonlinear optical properties and flexibility for photonic devices.
• Current graphene photonic components lack dynamic reconfigurability.

Purpose of the Study:

• To investigate the spatial self-phase modulation (SSPM) effect in a flexible graphene/polydimethylsiloxane (PDMS) composite under mechanical strain.
• To demonstrate the dynamic tunability of graphene's nonlinear optical response via strain.
• To develop strain-gated reconfigurable optical logic devices.

Main Methods:

• Fabrication of a flexible graphene/PDMS composite.
• Investigation of the spatial self-phase modulation (SSPM) effect under varying tensile strain.
• Measurement of the third-order nonlinear susceptibility (${\chi }_{\mathrm{monolayer}}^{\left(3\right)}$) of graphene.
• Design and demonstration of strain-gated optical switches and logic gates.

Main Results:

• Increasing tensile strain from 0% to 40% continuously suppressed SSPM diffraction rings from 8 to 0.
• The third-order nonlinear susceptibility (${\chi }_{\mathrm{monolayer}}^{\left(3\right)}$) decreased from 1.357 × 10^-7 to 6.125 × 10^-8 e.s.u.
• Strain-induced modifications in graphene's electronic band structure and effective interacting layers tuned the nonlinear optical response.
• Successfully designed and demonstrated a strain-gated optical switch and reconfigurable logic gates (OR/AND).

Conclusions:

• Mechanical strain dynamically tunes the nonlinear optical response of graphene/PDMS composites.
• This strain-tunable SSPM effect enables the development of reconfigurable graphene-based photonic devices.
• The study opens new pathways for flexible, tunable nonlinear photonic devices for advanced information processing.