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LSPR energy is sensitive to the dielectric performance of the material and the surrounding environment, shape and size of nanoparticles. That is, if a ligand such as a protein is attached to the surface of metal nanoparticles, its LSPR energy changes. Similarly, LSPR effects are sensitive to other changes, such as the distance between nanoparticles, which can be changed by the presence of surfactants or ions.One of the consequences of the LSPR effect in metal nanoparticles is the ability to absorb visible waves due to coherent oscillations of plasmons. Colloids of metal nanoparticles such as silver or gold can display colors such as red, purple or orange that cannot be seen in normal sizes . This color change depends on the shape, size and surrounding environment of silver nanoparticles. In the structure of nano-optical sensors, one of the nano-properties that distinguish metal nanoparticles from these large-scale materials is their optical properties. This is due to the localized surface plasmon resonance. In simpler words, when light hits (metal surfaces) with any sizes, some light waves along metal surfaces by creating surface plasmon, in fact, these waves give part of their energy to surface electrons and lead to their vibration (scattering). |
