Optical cross section - Wikipedia
Optical cross section (OCS) is a value which describes the maximum amount of optical flux reflected back to the source. [1] The standard unit of measurement is m 2 /sr. OCS is dependent on the geometry and the reflectivity at a particular wavelength of an object.
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The optical cross-section theorem is extended to cases in which the incident eld contains evanescent waves. Physical interpretations are discussed. Some explicit examples are given and possible applications are proposed. 1. In trod u c tion.
Here we will consider four different types of cross sections, which are commonly used in con-nection with radar. They are the scattering cross section ˙ s, the extinction cross section ˙ e, the absorption cross section ˙ a, and the backscattering cross section ˙ b. The scattering cross sec-
transition cross-sections – laser, emission, absorption cross-sections …
In laser physics, transition cross-sections are used to quantify the likelihood of optically induced transition events, e.g. of absorption or stimulated emission.
The optical cross-section theorem asserts that the total cross section s(u 0; v) (also called the extinction cross section), which is the sum of the scattering cross section s(s)(u 0, v) and the absorption cross-section s(a)(u 0, v), is given by the expression s~u 0; v! 5 4p k Im f~u 0, u 0; v!, (1.7) where Im denotes the imaginary part. 2.
First-order calculation of optical cross-section (OCS) based on …
Jun 7, 2024 · Optical cross section (OCS) is an important metric for optical systems in which unintended back reflections that propagate towards object space are of concern. This paper discusses the derivation and implementation of a first …
7.5: Absorption Cross-Sections - Chemistry LibreTexts
In the context of sample absorption characteristics, our use of the variable \(α\) for cross section should not be confused with another use as an absorption coefficient with units of cm-1 that is equal to \(Nα\) in Equation \ref{6.73}.
Here we show that the cross section of a localized subwavelength resonator can be drastically enhanced by orders of magnitude. A single microscopic nanoresonator could exhibit a macroscopic optical cross section.
Far-field scattering of plane waves from obstacles is treated in some detail, and the well-known optical cross-section theorem, which relates the scattering cross-section of an obstacle to its forward scattering amplitude, is derived.