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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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Switchable narrow nonlocal conducting polymer plasmonics.

Dongqing Lin¹, Yulong Duan¹, Pravallika Bandaru¹

¹Laboratory of Organic Electronics, Department of Science and Technology (ITN), Linköping University, Norrköping, Sweden.

Nature Communications

|May 21, 2025

Summary

This summary is machine-generated.

Researchers developed dynamically switchable surface plasmons in conducting polymers using collective lattice resonances (CLR) in poly(3,4-ethylenedioxythiophene) (PEDOT) nanoantennas. This breakthrough enhances organic plasmonic resonances, paving the way for advanced intelligent metasurfaces.

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Area of Science:

Plasmonics
Materials Science
Nanotechnology

Background:

Surface plasmons in conducting polymers offer potential for intelligent metasurfaces.
Previous polymer plasmons exhibited weak resonances and low quality factors (Q < 1-2).

Purpose of the Study:

To overcome limitations of polymer plasmons by enhancing resonance strength and Q factors.
To demonstrate dynamically switchable organic plasmonic resonances.

Main Methods:

Fabrication of periodic arrays of poly(3,4-ethylenedioxythiophene) (PEDOT) nanoantennas.
Utilizing collective lattice resonances (CLR) for nonlocal coupling.
Tuning CLR matching conditions and employing redox reactions for modulation.

Main Results:

Achieved organic plasmonic resonances with Q factors up to 12.
Demonstrated reversible switching of CLRs with a modulation depth of 7-45% via redox reactions.
Connected enhanced radiative coupling to diffractive lattice effects through angle-dependent extinction spectra.

Conclusions:

Nonlocal coupling via CLR significantly improves conducting polymer plasmonics.
Dynamically switchable organic plasmons are feasible for active metasurfaces and nano-optics.
This work circumvents previous limitations, enabling practical applications.