Toward Virus-Like Surface Plasmon Strain Sensors.

Area of Science:

• Nanotechnology
• Biophysics
• Materials Science

Background:

• Collective surface plasmon resonances in metal nanoparticle arrays exhibit strong configuration dependence.
• This property offers potential for developing nanoscale sensing tools.
• Virus capsids can encapsulate nanoparticle arrays, creating a confined system.

Purpose of the Study:

• To investigate the feasibility of using a virus capsid-encapsulated icosahedral nanoparticle array as a nanoscale strain sensor.
• To understand how mechanical deformations affect the optical properties of the nanoparticle system.

Main Methods:

• Numerical simulations were employed to model the behavior of the nanoparticle array within a virus capsid.
• The study analyzed changes in optical scattering cross-section spectra and induced electric field profiles.
• Investigated the influence of deformation symmetry, extent, and incident radiation parameters (propagation direction, polarization).

Main Results:

• Deformation of the nanoparticle array within the virus capsid leads to measurable changes in optical scattering spectra.
• The extent and symmetry of deformation directly correlate with spectral shifts and electric field profile alterations.
• Simulation results demonstrate sensitivity to nanoscale mechanical changes.

Conclusions:

• A virus capsid-encapsulated nanoparticle array shows promise as a bioinspired nanoscale strain sensor.
• This sensor design could be valuable for studying nanoscale mechanical processes, such as nanoparticle or virus translocation within host cells.