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Towards Electrotuneable Nanoplasmonic Fabry-Perot Interferometer.

Hayley Weir^1,2, Joshua B Edel¹, Alexei A Kornyshev³

¹Department of Chemistry, Imperial College London, London, SW7 2AZ, UK.

Scientific Reports

|January 14, 2018

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Researchers developed a tunable optical device using directed voltage-controlled assembly of plasmonic nanoparticles (NPs). This method allows for the rapid, electrical tuning of a nanoparticle-based Fabry-Perot interferometer

Area of Science:

Nanotechnology
Materials Science
Optics

Background:

Electrified solid-electrolyte interfaces (SEI) enable voltage-controlled assembly and disassembly of plasmonic nanoparticles (NPs).
Plasmonic nanoparticles offer unique optical properties for device applications.
Fabry-Perot (FP) interferometers are optical devices sensitive to cavity length and refractive index.

Purpose of the Study:

To propose and theoretically model a fast, electrotuneable nanoparticle-based Fabry-Perot interferometer.
To demonstrate the concept of directed assembly-disassembly of NPs for optical device fabrication.
To establish design guidelines for electrotuneable NP-based FP systems.

Main Methods:

Utilizing directed voltage-controlled assembly and disassembly of negatively charged plasmonic nanoparticles at electrified solid-electrolyte interfaces.

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Published on: September 5, 2017

Forming a Fabry-Perot cavity between two reflective NP-monolayers assembled at parallel transparent electrodes.

Applying theoretical modeling and full-wave simulations to analyze the optical response.

Main Results:

Demonstrated the formation and deconstruction of an FP cavity by altering electrode polarization.
Showed that inter-NP spacing and NP packing density can be tuned via applied potential.
Theoretical model and simulations exhibited excellent agreement, predicting tunable transmission spectrum, wavelength, and linewidth.

Conclusions:

The proposed system allows for in-situ, electrical tuning of optical characteristics without mechanical alteration.
Directed voltage-controlled assembly of plasmonic nanoparticles is a viable strategy for creating tuneable optical devices.
This work provides design guidelines for novel electrotuneable nanoparticle-based optical systems.