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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

Published on: July 11, 2025

Graphene-contact electrically driven microdisk lasers.

Yoon-Ho Kim¹, Soon-Hong Kwon, Jung Min Lee

¹Department of Physics, Korea University, Seoul 136-701, Republic of Korea.

Nature Communications

|October 11, 2012

Summary

This summary is machine-generated.

Researchers developed an electrically driven microdisk laser using a transparent graphene electrode. This breakthrough enables efficient current injection into nanostructures, achieving low-threshold lasing at room temperature for practical nanophotonics.

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Area of Science:

Nanophotonics and optoelectronics.
Materials science, focusing on graphene applications.

Background:

Active nanophotonic devices offer low power consumption, high speed, and integration density.
Electrical operation is crucial for practical nanophotonics but challenging due to difficulties in introducing current paths without impacting optical properties.
Previous methods for electrically driven nanolasers involved complex fabrication.

Purpose of the Study:

To demonstrate an electrically driven microdisk laser using a novel current injection method.
To overcome fabrication challenges associated with integrating electrical components into nanophotonic devices.
To explore the potential of graphene as a transparent electrode for nanophotonic applications.

Main Methods:

Fabrication of a microdisk laser cavity.
Integration of a transparent graphene electrode conformally covering the nanostructure.
Electrical current injection through the graphene electrode.
Characterization of lasing performance and electroluminescence.

Main Results:

Achieved room-temperature lasing operation in an electrically driven microdisk laser.
Demonstrated efficient current injection via a transparent graphene electrode.
Reported a low-threshold current of approximately 300 μA.
Observed significant electroluminescence from a graphene-contacted nanopillar structure.

Conclusions:

Graphene electrodes provide an efficient and non-disruptive method for electrical operation of nanophotonic devices.
This approach simplifies fabrication and enables practical applications of integrated photonic systems.
The study presents a new paradigm for integrating electronics with complex, non-planar nanostructures.