Room-Temperature Gate Voltage Modulation of Plasmonic Nanolasers.

Area of Science:

• Plasmonics
• Nanophotonics
• Materials Science

Background:

• Plasmonic nanolasers offer potential for high-speed optical devices.
• Electrical modulation of nanolasers remains a challenge for practical applications.
• Hybrid platforms integrating graphene show promise for optoelectronic devices.

Purpose of the Study:

• To achieve stable electrical modulation of plasmonic nanolasers at room temperature.
• To explore the use of a hybrid graphene-insulator-metal (GIM) platform for nanolaser modulation.
• To investigate the potential for terahertz modulation speeds in such devices.

Main Methods:

• Fabrication of a GIM platform with a zinc oxide (ZnO) nanowire plasmonic cavity.
• Utilizing graphene as a transparent electrode for gate voltage application.
• Analyzing the effect of gate voltage on surface plasmon polariton (SPP) resonance and lasing thresholds.

Main Results:

• Stable electrical modulation of ZnO nanowire plasmonic nanolasers was achieved on the GIM platform.
• Gate voltage application modulated the SPP dispersion and internal loss of the plasmonic cavity.
• Lasing thresholds were successfully modulated by the applied gate voltage.
• Nanolasers demonstrated potential for ultrahigh modulation speeds on the order of terahertz.

Conclusions:

• The GIM platform enables effective gate voltage modulation of ZnO nanowire plasmonic nanolasers at room temperature.
• This approach offers a pathway to high-speed, versatile plasmonic circuits.
• The demonstrated technology holds significant potential for future optoelectronic applications.