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Self-assembled three-dimensional nanocrown array.

Soongweon Hong¹, Taewook Kang, Dukhyun Choi

¹Biomolecular Nanotechnology Center, Berkeley Sensor and Actuator Center, Department of Bioengineering, University of California at Berkeley, Berkeley, California 94720, United States.

|June 8, 2012

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We developed a self-assembled gold nanocrown array for advanced nanoplasmonics. This ordered nanoprobe array offers tunable optical properties for applications in light harvesting and molecular imaging.

Area of Science:

Plasmonics and Nanotechnology
Materials Science
Optical Engineering

Background:

Ordered nanoplasmonic arrays are crucial for light harvesting, selective frequency response (nanoantennas), and molecular/cellular imaging.
Conventional fabrication techniques face limitations due to serial processing and the diffraction limit of light.

Purpose of the Study:

To demonstrate a novel, thermodynamically driven, self-assembled three-dimensional nanocrown array.
To overcome fabrication limitations of ordered nanoplasmonic probes for enhanced optical applications.

Main Methods:

Fabrication of a large-area ordered nanoprobe array using thermal dewetting of thin gold film on porous anodic alumina (PAA).
Utilizing the PAA template's structural order to guide the self-assembly of gold nanoparticles into a nanocrown structure.

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Characterization of the nanocrown array's tunable size, arrangement, and periodicity.

Main Results:

Successful demonstration of a self-assembled three-dimensional nanocrown array composed of a core and six satellite gold nanoparticles (GNPs).
The array exhibits multiple optical resonance frequencies in the visible spectrum.
The nanocrown array displays angle-dependent optical properties due to its tunable structural characteristics.

Conclusions:

The developed self-assembly method enables large-area fabrication of ordered nanoplasmonic probe arrays.
The nanocrown array's tunable optical properties make it a promising platform for advanced light harvesting and imaging technologies.
This approach offers a scalable solution for creating sophisticated nanoplasmonic structures.