What is plasmon enhanced fluorescence?
During plasmon enhanced fluorescence, Po, refers to the excitation power that is absorbed by the fluorophore and nanoparticles leading to its excited state. Localized surface plasmon resonance describes the collective oscillations of electrons that lead to intense electromagnetic local fields.
What is surface enhanced fluorescence?
The technique of surface enhanced fluorescence (SEF) is based upon the design of surfaces in the vicinity of the emitter. SEF yields an overall improvement in the fluorescence detection efficiency through modification and control of the local electromagnetic environment of the emitter.
How does plasmon work?
SPR occurs when polarized light strikes an electrically conducting surface at the interface between two media. This generates electron charge density waves called plasmons, reducing the intensity of reflected light at a specific angle known as the resonance angle, in proportion to the mass on a sensor surface.
What is fluorescence enhancement?
The fluorescence emission is enhanced by increasing the absorption at excitation wavelengths of the fluorescent molecules and reducing the fluorescent energy dissipation with an antireflective array.
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.
What is surface plasmon 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 you excite the surface of plasmon?
To excite a surface plasmon you need a component of E field acting along the surface in the same direction as the K vector, as a surface plasmon is a longitudinal excitation, therefore K.E =/= 0 (in free space, K.E = 0 as they are always perpendicular).
What causes surface plasmon resonance?
Surface Plasmon Resonance is a phenomenon that occurs when polarized light hits a metal film at the interface of media with different refractive indices.
What is surface plasmon resonance simple explanation?
Surface plasmon resonance (SPR) is the collective oscillation of conduction band electrons that are in resonance with the oscillating electric field of incident light, which will produce energetic plasmonic electrons through non-radiative excitation.