What is surface plasmon resonance of gold nanoparticles?
Gold nanoparticles absorb and scatter light with extraordinary efficiency. This oscillation is known as a surface plasmon resonance (SPR), and it causes the absorption and scattering intensities of gold nanoparticles to be much higher than identically sized non-plasmonic nanoparticles.
What is surface plasmon resonance effect?
Surface plasmon resonance (SPR) is the manifestation of a resonance effect due to the interaction of conduction electrons of metal nanoparticles with incident photons. The interaction relies on the size and shape of the metal nanoparticles and on the nature and composition of the dispersion medium.
How do I tune my surface plasmon resonance frequency?
Surface plasmon resonance can also be tuned based on the shape of the nanoparticle. The plasmon frequency can be related to the metal dielectric constant. The enhancement falls off quickly with distance from the surface and, for noble metal nanoparticles, the resonance occurs at visible wavelengths.
Why is a prism needed in SPR?
A prism or a diffraction grating are needed because you need to match the momentum of the incident light to that of the surface polariton, i.e. the longitudinal oscillations along the surface.
What is Surface Plasmon theory?
The term surface plasmon is used both for polarization oscillation of metallic nanoparticles and for waves propagating along a plane interface and exponentially decaying away from the interface. From the point of view of optics, surface plasmons are modes of an interface.
Is there plasmon resonance in gold nanoparticles?
Surface plasmon resonance in gold nanoparticles: a review In the last two decades, plasmon resonance in gold nanoparticles (Au NPs) has been the subject of intense research efforts. Plasmon physics is intriguing and its precise modelling proved to be challenging.
What is LSPR (localized surface plasmon resonance)?
Noble metal nanoparticle-based localized surface plasmon resonance (LSPR) is an advanced and powerful label-free biosensing technique which is well-known for its high sensitivity to the surrounding refractive index change in the local environment caused by the biomolecular interactions around the sensing area.
What are plasmon-enhanced phenomena used for?
Also, plasmon-enhanced phenomena are highly interesting for multiple purposes, including, for instance, Raman spectroscopy of nearby analytes, catalysis, or sunlight energy conversion.