The LPR can be controlled in frequency by varying both the size and the shape of the nanoparticles and the dielectric constant of the surrounding medium1. Due to the electron-electron collisions, the localized electric field generated around the nanoparticles is converted to heat and the nanoparticles behave as nanoscale sources of heat. It is a challenge to measure the temperature variation at the surface of the nanoparticles under optical illumination since nano-localized temperature variation is the most important parameter for applications ranging from nanomedicine to photonics. In particular, the conversion of light to heat trough the exploitation of the LPR has enabled a remarkable breakthrough in fighting cancer2.
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