Study On Particle Radiation Characteristics Based On Mie Resonance And Kerker Condition

Building energy conservation is one of the hot topics in today’s society.Increasing the reflection of building surfaces can reduce the heat absorption of buildings,which can reduce energy consumption.Therefore,reducing the reflection coating of building heat absorption is the focus of research on building energy efficiency;The new energy source is mainly used,but the conversion efficiency of the solar cell is low.By reducing the reflection of the solar cell,the energy collected by the solar cell can be increased,thereby improving the conversion efficiency of the solar energy,and therefore the anti-reflective coating which is beneficial to improving the solar energy efficiency is also worthwhile.Explore.In this paper,the particle’s radiation characteristics are controlled based on the particle’s Mie resonance and Kerker conditions.First,the basic theory and calculation method of particle radiation regulation are introduced.Mie scattering theory is a classical theory to study the scattering and absorption of light by particles.When the particles satisfy certain conditions,the particles will undergo Mie resonance.The interaction between the electric dipole resonance of the particle and the magnetic dipole resonance makes the particle satisfy the Kerker condition.When the particle satisfies the first Kerker condition,the particle has the largest forward scatter and the back scatter is 0.When the particle satisfies the second Kerker condition,the backscattering of the particles is the largest.Because the Mie scattering theory is mainly for spherical particles,in order to study the scattering properties of particles of arbitrary geometry,the theory of multi-dipole decomposition is introduced and its effectiveness is verified.Secondly,the anti-reflective properties of the particles are controlled based on the Mie resonance and the first Kerker conditions.The results show that the wavelength position with the lowest reflectivity will red-shift as the refractive index and extinction coefficient of the particle material,the radius of the particle and the refractive index of the environmental medium increase,and the fluctuation will occur as the particle spacing increases.The absorption rate at the minimum wavelength position is mainly affected by the extinction coefficient of the particle material,but will remain constant when the absorption rate increases to a certain value.Factors such as geometry,spherical shell thickness,substrate thickness,and particle mixing also affect the wavelength position of the minimum reflectivity.Finally,the reflection characteristics of the particles are adjusted based on the Mie resonance and the second Kerker condition.The results show that the periodic array of titanium dioxide spherical particles with a refractive index of 1 and a radius of 100 nm and a 60 nm spacing has better reflection in the visible range.,which can achieve perfect reflection in the wavelength range of 455 nm to 495 nm.Among particles of different geometries,spherical particles have the best reflection effect,while the thickness of the spherical shell and the thickness of the substrate also have an effect on the maximum reflectivity.