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Localized surface plasmons in vibrating graphene nanodisks.

Weihua Wang¹, Bo-Hong Li, Erik Stassen

¹Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark. asger@mail.aps.org jochri@fotonik.dtu.dk.

|January 28, 2016

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Localized surface plasmons in graphene disks are tuned by mechanical vibrations. This acoustic modulation of light-matter interactions enhances plasmonic detectors for nanophotonic devices.

Area of Science:

Nanophotonics
Plasmonics
Condensed Matter Physics

Background:

Localized surface plasmons (LSPs) are collective electron oscillations in metallic nanoparticles, crucial for sensing applications due to their light-driven optical response.
Graphene disks offer tunable plasmons via electrical stimulation, enhancing their potential in optoelectronic devices.
Mechanical vibrations can significantly alter structural deformations, thereby modulating LSP excitation.

Purpose of the Study:

To investigate the modulation of localized surface plasmons in graphene disks by mechanical vibrations.
To explore the relationship between acoustic excitations, structural deformations, and plasmonic mode patterns.
To demonstrate the potential for tuning light-matter interactions in graphene for advanced nanophotonic applications.

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Main Methods:

Theoretical analysis of spectral shifts in localized surface plasmons under mechanical strain.
Modeling the interplay between vibrational mode symmetry/shape and plasmonic mode patterns.
Investigating acoustic modulation of plasmon excitation in graphene disks.

Main Results:

The spectral shift of LSPs in graphene disks is shown to be dependent on the symmetry and shape of modal vibrations.
A complex interplay between structural deformations and plasmonic modes dictates the observed spectral shifts.
Acoustic excitations provide a novel method for modulating confined light modes in graphene.

Conclusions:

Tuning confined light modes in graphene via acoustic excitations opens new possibilities for enhancing plasmonic detector sensitivity.
This approach offers a pathway to improve light-matter interactions for molecules and other optical emitters in nanophotonic devices.
The findings pave the way for novel, tunable plasmonic sensors and enhanced optical devices.