_ Nanoelectronics and Plasmonic Particles Department
The links between (nanoelectronic devices and plasmonic nanoparticles) are divided into several parts.
Researcher and Author: Dr. ( Afshin Rashid)
Note: Plasmonics is divided into two components, each of which is the application of metals and electromagnetic waves at nanometer specifications in two-dimensional, one-dimensional, and even zero-dimensional structures.
These two areas are:
1_ Localized Surface Plasmons
2_ Surface Plasmon Polariton
1.2-Localized Surface Plasmons
Surface plasmon resonances are coherent and cumulative oscillations of metal electrons excited by radiation.
The oscillation condition is that the frequency of the emitted photons is the same as the natural frequency of the surface electrons (which is to overcome the core-core force). Surface plasmon resonance in nanometer-sized structures is called localized surface plasmon resonance.
Localized surface plasmons are the non-diffusive excitation of conduction band electrons in metallic nanostructures to which an electromagnetic field has been coupled. Plasmonic waves arise from a conducting nanoparticle whose dimensions are below the wavelength of the excitation electromagnetic field by using the scattering problem.
The interaction of a particle of size d with electromagnetic waves of excitation wavelength λ can be investigated in various analytical, semi-analytical and numerical methods. Of course, in these analyses, the assumption is always taken into account that d≪λ, i.e. the particle dimensions are much smaller than the wavelength. The phase of the harmonic oscillation of the electromagnetic field in the particle volume is assumed to be constant.
The following conditions affect the excitation of localized surface plasmons and their characteristics:
- Electronic properties of nanoparticles
- Dimensions and shape of nanoparticles
- Thermal properties of nanoparticles
- Dielectric surrounding the nanoparticle
Of course, it is important to note that the intensity of the electromagnetic field (specifically the intensity of the electric field) decreases exponentially as you move away from the surface of the metal nanoparticle.
In this created nanovolume, the electromagnetic field is locally compressed and enhanced. Small changes in the dielectric around the nanovolume affect the surface plasmon resonance, so that these changes are reflected in the amount of scattered light, absorbed light or a change in its wavelength. These changes can be measured using optical characteristics. The oscillation of surface electrons and the electric field around them is reflected in the local surface plasmon resonance.
Conclusion:
Plasmonics is divided into two components, each of which is the application of metals and electromagnetic waves at nanometer specifications in two-dimensional, one-dimensional, and even zero-dimensional structures.
Researcher and Author: Dr. ( Afshin Rashid)
Specialized PhD in Nano-Microelectronics