Circular magnetoplasmonic modes in gold nanoparticles.
The quest for efficient ways of modulating localized surface plasmon resonance is one of the frontiers in current research in plasmonics; the use of a magnetic field as a source of modulation is among the most promising candidates for active plasmonics. Here we report the observation of magnetoplasmonic modes on colloidal gold nanoparticles detected by means of magnetic circular dichroism (MCD) spectroscopy and provide a model that is able to rationalize and reproduce the experiment with unprecedented qualitative and quantitative accuracy. We believe that the steep slope observed at the plasmon resonance in the MCD spectrum can be very efficient in detecting changes in the refractive index of the surrounding medium, and we give a simple proof of principle of its possible implementation for magnetoplasmonic refractometric sensing.
Department of Chemistry, University of Florence & INSTM , 50019 Florence, Italy.
Francesco
F
Pineider
Giulio
G
Campo
Valentina
V
Bonanni
César de Julián
Cde J
Fernández
Giovanni
G
Mattei
Andrea
A
Caneschi
Dante
D
Gatteschi
Claudio
C
Sangregorio
D015374:Biosensing Techniques; D002942:Circular Dichroism; D003102:Colloids / Q000737:chemistry; D006046:Gold / Q000737:chemistry; D060526:Magnetic Fields; D053768:Metal Nanoparticles / Q000737:chemistry*; D012031:Refractometry
D003102:Colloids; D006046:Gold