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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

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Colloidal plasmonic nanostar antennas with wide range resonance tunability.

Ted V Tsoulos¹, Supriya Atta², Maureen J Lagos³

¹Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, NJ 08854, USA. lfabris@soe.rutgers.edu.

|October 5, 2019

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Researchers developed a novel 6-spike gold nanostar, overcoming limitations of previous designs. This new plasmonic nanoparticle offers tunable resonances from 600-2000 nm for advanced applications.

Area of Science:

Nanotechnology
Materials Science
Plasmonics

Background:

Gold nanostars are key plasmonic nanoparticles due to strong field enhancement and tunable resonances.
Limitations include complex morphology and poor monodispersity, hindering technological use.

Purpose of the Study:

To address limitations of existing gold nanostars by designing and realizing a novel 6-spike nanostar.
To create a 3D plasmonic nanoantenna with wide-range tunability and improved stability.

Main Methods:

Computational study of a novel 6-spike nanostar morphology.
Synthetic realization of the proposed nanostar design.
Experimental characterization of plasmonic properties from single particles to ensembles.

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Main Results:

The 6-spike nanostar exhibits a unique plasmonic response, consistent from single particles to ensembles.
Multiple, well-separated, narrow resonances were observed.
The intense resonance extended farther in space than previously reported for similar nanostructures.
Resonant modes were tunable across a broad range (600–2000 nm).

Conclusions:

The novel 6-spike nanostar overcomes previous limitations, offering a robust platform for plasmonic applications.
Its unique morphology-plasmonic correlation enables wide tunability, suitable for cutting-edge technologies.
This design merges advantages of top-down and bottom-up fabrication methods.