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Tunable and directional plasmonic coupling within semiconductor nanodisk assemblies.

Su-Wen Hsu¹, Charles Ngo, Andrea R Tao

¹NanoEngineering Department, University of California, San Diego , La Jolla, California 92093-0448, United States.

|April 18, 2014

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Semiconductor nanocrystals, specifically copper sulfide (Cu2-xS) nanodisks, exhibit tunable near-field coupling for infrared plasmonics. Their orientation significantly impacts localized surface plasmon resonance excitation, enabling new nanoscale light-matter interactions.

Area of Science:

Nanotechnology
Materials Science
Plasmonics

Background:

Semiconductor nanocrystals offer potential for localized surface plasmon resonance (LSPR) beyond visible light, crucial for sensing and infrared applications.
Unlike metal nanoparticles, the near-field behavior of semiconductor nanocrystals, influenced by carrier density and mobility, is less understood.

Purpose of the Study:

To investigate near-field coupling in anisotropic semiconductor nanocrystals.
To explore the influence of material composition and orientation on LSPR in copper sulfide (Cu2-xS) nanodisks.

Main Methods:

Fabrication of anisotropic disk-shaped Cu2-xS nanocrystals with varying copper content (Cu1.96S, Cu7.2S4, CuS).
Assembly of nanocrystals into mono- and multilayer films.
Investigation of LSPR excitation and near-field coupling through nanodisk orientation and crystal phase variations.

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Main Results:

Demonstrated dipole-dipole LSPR coupling between neighboring Cu2-xS nanodisks in assembled films.
Observed significant changes in LSPR magnitude and polarization direction based on nanodisk orientation.
Showcased tunability of electronic properties by modulating copper content in Cu2-xS.

Conclusions:

Semiconductor nanocrystals like Cu2-xS can serve as tunable building blocks for infrared plasmonics.
Nanocrystal orientation is a critical factor in controlling LSPR and near-field interactions.
This work opens avenues for low-cost, active plasmonic devices and nanoscale light-matter interaction studies.