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Computer Design of Diffractive Optics by V Soifer

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10

Optical manipulation of micro–objects by DOE

10.1 The strength of interaction of the light field with micro–objects

10.1.1 The strength of interaction of the light field with micro–and nanoparticles

10.1.1.1 Light pulse

The method of optical trapping and manipulation of small neutral particles using lasers is based on the strength of radiation pressure. The light field is represented in the form of quanta called photons. Each photon carries a momentum equal to p = ħk, where k is the wave vector, |k| = k = 2π/λ, ħ - Planck’s constant. Interaction between radiation and matter can lead to an exchange (change) of the momentum. The basic principle of the traps can be explained by Newton’s second and third laws. Since light has a momentum change, ...

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