Giant electro-optic coefficient in a graphene oxide film

Area of Science:

• Materials Science
• Optics
• Nanotechnology

Background:

• The electro-optic effect is crucial for tuning material refractive indices in optical devices.
• Applications include communications, switching, modulation, and nonlinear optics.

Purpose of the Study:

• To measure the quadratic electro-optic coefficient of graphene oxide (GO) films.
• To evaluate the potential of GO films for improving electro-optic devices.

Main Methods:

• Ellipsometry spectroscopy was employed to measure the quadratic electro-optic coefficient.
• Characterization of birefringence in GO films at 730 nm.

Main Results:

• The quadratic electro-optic coefficient of GO films was found to be approximately three orders of magnitude greater than other materials.
• A significant birefringence of Δn = 0.08 at 730 nm was achieved.
• The GO film demonstrated a giant electro-optic Kerr coefficient.

Conclusions:

• Graphene oxide films possess a superior electro-optic Kerr coefficient, outperforming conventional materials.
• GO films can enhance electro-optic devices by reducing power consumption and operating voltage requirements.
• The observed birefringence suggests promising advancements for commercial optical devices, potentially lowering working voltages below 10 V.