Buried graphene electrode heater for a polymer waveguide thermo-optic device

Area of Science:

• Photonics and Materials Science
• Optoelectronics
• Nanomaterials

Background:

• Conventional thermo-optic (TO) devices require a buffer layer to isolate metal electrodes from polymer waveguides.
• This buffer layer increases device complexity and power consumption.
• Metal electrodes can also introduce optical loss, particularly for specific polarization states.

Purpose of the Study:

• To investigate graphene as a novel electrode material for polymer waveguide thermo-optic devices.
• To demonstrate the potential of buried graphene electrodes to reduce driving power and improve performance.
• To compare the performance of devices with buried graphene electrodes versus surface-deposited aluminum electrodes.

Main Methods:

• Fabrication of two polymer waveguide thermo-optic mode switches based on a balanced Mach-Zehnder interferometer configuration.
• One device utilized a buried graphene electrode, while the other used a surface-deposited aluminum electrode.
• Performance comparison focusing on switching power and response time.

Main Results:

• The polymer waveguide device with a buried graphene electrode exhibited a switching power nearly four times lower than the device with an aluminum electrode.
• The graphene-electrode device demonstrated a faster response time.
• Buried graphene electrodes did not introduce significant optical loss for transverse magnetic polarized light.

Conclusions:

• Graphene is an effective material for electrode heaters in polymer waveguide thermo-optic devices.
• Utilizing buried graphene electrodes eliminates the need for a buffer layer, reducing power consumption and improving device speed.
• This approach offers a promising pathway for developing more energy-efficient optoelectronic devices.