_ Nanoplasmonics and Nanoelectronics Model Section 

Nanoplasmonic pattern and  small changes in the dielectric around the nanovolume

Researcher  and Author: Dr.   (   Afshin Rashid)



Note: Small changes in the dielectric surrounding the nanovolume affect the resonance of surface plasmons, such that these changes manifest themselves in the amount of scattered radiation, absorbed radiation, or a change in its wavelength. 

In the structure forming  nanostructures (nanoplasmonics),   the volume of the electromagnetic field created is localized, compressed, and enhanced.  A nanostructure is defined as any structure with one or more dimensions and is measured in the nanometer range. Nanostructures  refer to materials or structures that   have at least one dimension between 1 and 100 nanometers . The importance of the nanoscale is in changing the properties and characteristics of materials in these dimensions. Properties such as  electrical conductivity, electromagnetic properties, etc. The onset of a change in the properties of materials by  miniaturization depends more than anything on the type of material and the desired property. For example, as  the dimensions of a material decrease, generally some of the electromagnetic properties of the nanomolecular materials, such as the conductivity of nanoparticle particles in the material, improve. This increase in strength  does not occur only in the range of a few nanometers, and the strength of a material of several tens or even hundreds of nanometers may  be much greater than that of a large-scale bulk material.  These changes can be measured using optical characteristics. It shows the oscillation of surface electrons and the electric field around them in the resonance of localized surface plasmons.



For example, as the dimensions of a nanostructured material (nanoplasmonics)  decrease   , some of the mechanical properties of the material, such as strength, generally improve. This increase in strength does not occur only in the range of a few nanometers, and the strength of a material of several tens or even hundreds of nanometers may be much greater than that of a large-scale bulk material. On the other hand, changes in some properties, such as color and magnetic properties, may occur in dimensions of only a few nanometers. Nanoplasmonics is expressed based on the interaction process between electromagnetic waves and conduction electrons in metals with nanoscale dimensions .  Analytically, the reason for the rapid drop in energy of electrons passing through metals is that this energy is spent on the collective and oscillatory motion of free electrons in the metal, which is called a plasmon.  These nanostructures consist of metal and dielectric, whose dimensions are below the excitation wavelength (the wavelength of the radiation that excites plasmonic waves).



Conclusion: 

In the nanostructures  (nanoplasmonics),   the created volume of the electromagnetic field is locally compressed and enhanced. Small changes in the dielectric surrounding the nanovolume affect the resonance of surface plasmons, so that these changes are manifested in the amount of scattered radiation, absorbed radiation or a change in its wavelength. 

Researcher  and Author: Dr.   (   Afshin Rashid)

Specialized PhD in Nano-Microelectronics