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Discrete dipole approximation information


In the discrete dipole approximation, a larger object is approximated in terms of discrete radiating electric dipoles.

Discrete dipole approximation (DDA), also known as coupled dipole approximation,[1] is a method for computing scattering of radiation by particles of arbitrary shape and by periodic structures. Given a target of arbitrary geometry, one seeks to calculate its scattering and absorption properties by an approximation of the continuum target by a finite array of small polarizable dipoles. This technique is used in a variety of applications including nanophotonics, radar scattering, aerosol physics and astrophysics.



Magnitude of the electric field strength (colored) and the Poynting vector (black arrows) in the near field of the vertically oriented dipole in the image plane. Blue/red colors indicate an electric field oriented downwards/upwards.
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Discrete dipole approximation

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Discrete dipole approximation (DDA), also known as coupled dipole approximation, is a method for computing scattering of radiation by particles of arbitrary...

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Electric dipole moment

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is sometimes called the point dipole approximation, the discrete dipole approximation, or simply the dipole approximation. Not to be confused with spin...

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Light scattering by particles

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The discrete dipole approximation is an approximation of the continuum target by a finite array of polarizable points. The points acquire dipole moments...

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Computational electromagnetics

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a method to find the particular inhomogeneous solution. The discrete dipole approximation is a flexible technique for computing scattering and absorption...

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Rayleigh scattering

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wavelength of the light is typically treated by the Mie theory, the discrete dipole approximation and other computational techniques. Rayleigh scattering applies...

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DDA

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Analysis, an analysis procedure used in physics and engineering Discrete dipole approximation, method for computing scattering of radiation by particles of...

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Codes for electromagnetic scattering by spheres

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homogeneous spherical particles, there are other techniques, such as discrete dipole approximation, FDTD, T-matrix, which can also be used for such tasks. The...

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Gans theory

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silver and gold nanorods. A popular alternative for this is the Discrete dipole approximation (DDA) method. Gans theory gives the exact solution for spheroidal...

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Dipole antenna

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In radio and telecommunications a dipole antenna or doublet is one of the two simplest and most widely-used types of antenna; the other is the monopole...

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Overtone band

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rules). Importantly, under the simple harmonic approximation, it can be shown that the transition dipole moment is non-zero only for transitions where...

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Codes for electromagnetic scattering by cylinders

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by cylindrical particles, relevant links, and applications. Discrete dipole approximation codes Codes for electromagnetic scattering by spheres Computational...

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Einstein coefficients

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of second quantization. This is because the theory developed by dipole approximation and time dependent perturbation theory gives a semiclassical description...

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Effective medium approximations

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electromagnetic field for electric-dipole oscillation mode inside the picked particle was computed without applying quasi-static approximation. Thus the function J...

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Stimulated emission

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the lower state, N1. The B coefficients can be calculated using dipole approximation and time dependent perturbation theory in quantum mechanics as: B...

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Charge density

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Bound charges set up electric dipoles in response to an applied electric field E, and polarize other nearby dipoles tending to line them up, the net...

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Dirac delta function

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analogue of the Kronecker delta function, which is usually defined on a discrete domain and takes values 0 and 1. The mathematical rigor of the delta function...

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Dust astronomy

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solar spectrum. It can be calculated by using e.g. Mie theorie, discrete dipole approximation, or even microwave analog experiments. Solar radiation pressure...

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Quadrupole

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orbiting each other on a circular orbit, an approximation to e.g. special case of binary black holes. Since the dipole moment is constant, we can for convenience...

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Atmospheric radiative transfer codes

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intensity, the lower-state energy, the line width and the shape. Discrete dipole approximation codes Codes for electromagnetic scattering by cylinders Codes...

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Ewald summation

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interacting dipoles on a shell of radius R {\displaystyle R} grows like R 2 {\textstyle R^{2}} ; (2) the strength of a single dipole-dipole interaction...

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