Photosensitive gold-nanoparticle-embedded dielectric nanowires

Area of Science:

• Nanotechnology
• Materials Science
• Optoelectronics

Background:

• Noble-metal nanoparticles in dielectric matrices offer enhanced third-order nonlinear susceptibility near surface-plasmon-resonance (SPR).
• These properties are crucial for ultrafast all-optical switching devices.

Purpose of the Study:

• To fabricate self-organized photosensitive gold nanoparticle chains encapsulated in dielectric nanowires.
• To investigate the photoresponse of these hybrid nanostructures for optical switching applications.

Main Methods:

• Utilized a microreactor approach for fabricating gold nanoparticle chains within dielectric nanowires.
• Fabricated gold nanopeapodded silica nanowires and plain silica nanowires for comparison.
• Demonstrated a two-terminal device using an ensemble of these nanowires.

Main Results:

• The hybrid nanowires exhibited pronounced SPR absorption.
• A strong, wavelength-dependent, and reversible photoresponse was observed in gold nanopeapodded silica nanowires under illumination.
• Plain silica nanowires showed no photoresponse, highlighting the role of gold nanoparticles.

Conclusions:

• Gold nanopeapodded silica nanowires show potential as wavelength-controlled optical nanoswitches.
• The microreactor fabrication method is versatile for creating 1D metal-dielectric nanostructures for various applications.
• These nanostructures can serve as building blocks for nanoscale waveguiding devices, sensors, and optoelectronics.