Reduced graphene oxide wrapped on microfiber and its light-control-light characteristics

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Reduced graphene oxide (rGO) exhibits unique optical and electrical properties.
• Microfiber (MF) technology offers compact platforms for optical sensing and manipulation.
• Evanescent fields in optical fibers enable sensitive light-matter interactions.

Purpose of the Study:

• To investigate the optical manipulation of microfiber transmitted power using reduced graphene oxide.
• To explore the potential of rGO-wrapped microfiber as an all-optically controllable device.
• To analyze the response of the optical transmitted power to different laser wavelengths and power levels.

Main Methods:

• Wrapping reduced graphene oxide sheets onto the tapered region of a microfiber.
• Illuminating the rGO-wrapped microfiber with 405 nm (violet) and 980 nm (infrared) lasers.
• Measuring the transmitted optical power at 1550 nm under varying laser illumination conditions (outside-pumped and inside-pumped experiments).

Main Results:

• A relative variation of ~1.7 dB in transmitted optical power was observed with 405 nm laser power ranging from 0 to 12 mW.
• A relative variation of ~6 dB in transmitted optical power was achieved by changing the 980 nm laser power from 0 to 156.5 mW.
• The optical transmitted power of the microfiber with rGO was demonstrably manipulated by mW-level optical inputs.

Conclusions:

• Reduced graphene oxide wrapped on microfiber enables efficient interaction with optical evanescent fields.
• The device demonstrates all-optical control of transmitted power, tunable by visible and infrared light.
• This rGO-MF device shows significant potential for versatile, all-optically controlled applications.