evanescent field

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evanescent field

In an optical fiber, the light that passes from the core into the cladding. See fiber optics glossary.
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References in periodicals archive ?
The red and blue solid curves indicate the variation of field strength of the evanescent wave generated by point A go through the superlens with [k.sub.x] = 1.5[k.sub.0] and [k.sub.x] = 3[k.sub.0], respectively.
It should be noted that the slab is illuminated with an adjacent source that has a wide range of spatial frequency components, including propagating and evanescent waves, exemplifying the potential influence of non-local effects and spatial dispersion (e.g., the excitation of TM SPPs).
ATR works well for these samples because the intensity of the evanescent waves decays exponentially with distance from the surface of the ATR crystal, making the technique generally insensitive to sample thickness.
Feasibility of evanescent wave interferometeec immunosensors for pesticide detection: chemical aspects.
Metamaterial exhibits some novel electromagnetic and optical properties which are not found in nature media, for example, negative refraction, reversals of both Doppler shift and Cherenkov radiation [2], enhancement of evanescent wave, and subwavelength imaging [6].
has developed the White Light TIRF Microscopy Illumination system (W-TIRF Illumination system), which when used together with the company's new 1.49 NA TIRF objectives, provide the capability of evanescent wave. oblique variable angle, and standard wide-field epi-fluorescence illumination.
The capability of optical fibres to function as sensors is usually attributed to operation by excitation of fluorescence using an evanescent wave, which will exist when the refractive index of the waveguide is greater than the refractive index of the coating of organic material.
The wave from the state A (D) to the state B (E) is concentrated wave, and the wave from the state B (E) to the state A (D) is evanescent wave, both of which are progressive waves.
Optical fiber sensors based on evanescent wave generate a strong interaction between the guided wave and the surrounding materials.
Many types of optical fiber hydrogen sensors have been proposed, including evanescent wave absorption devices [9,10], micromirror optode [11,12], Mach-Zehnder interferometers [13], surface plasmon resonance (SPR) devices [14], and fiber Bragg gratings (FBG) [15-17].
The parameters, such as gathering wave velocity, the evanescent wave velocity, and the relationship between the shockwave velocity and the density, are analyzed.