An electrically driven, ultrahigh-speed, on-chip light emitter based on carbon nanotubes

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Optical interconnects are crucial for high-speed data transfer on silicon chips.
• Existing light emitters face limitations in speed and integration compatibility.

Purpose of the Study:

• To demonstrate an electrically driven ultrafast light emitter based on carbon nanotubes (CNTs).
• To achieve response speeds comparable to or exceeding current light-emitting diodes (LEDs) and laser diodes (LDs).
• To enable on-chip and interchip optical interconnects.

Main Methods:

• Fabrication of an electrically driven CNT light emitter utilizing blackbody radiation.
• Characterization of the emitter's response speed and pulsed light generation capabilities.
• Analysis of the thermal properties influencing the CNT film's fast temperature response.

Main Results:

• Demonstrated the first electrically driven ultrafast CNT light emitter with response speeds of 1-10 Gbps.
• Achieved a speed over 10^6 times faster than conventional incandescent emitters.
• Experimentally generated 140 ps width pulsed light and demonstrated real-time optical communication.

Conclusions:

• CNT-based blackbody radiation emitters offer ultrafast response speeds, small footprints, and silicon integration potential.
• This technology can enable novel architectures for optical interconnects and integrated photonic circuits.
• The fast thermal response of CNT films is key to achieving high-speed light emission.