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Dielectric mirrors are also used to produce ultra-high reflectivity mirrors: values of 99.999% or better over a narrow range of wavelengths can be produced using special techniques. Alternatively, they can be made to reflect a broad spectrum of light, such as the entire visible range or the spectrum of the Ti-sapphire laser.
Time-resolved simulation of a pulse reflecting from a Bragg mirror. A distributed Bragg reflector (DBR) is a reflector used in waveguides, such as optical fibers.It is a structure formed from multiple layers of alternating materials with different refractive index, or by periodic variation of some characteristic (such as height) of a dielectric waveguide, resulting in periodic variation in the ...
A chirped mirror is a dielectric mirror with chirped spaces—spaces of varying depth designed to reflect varying wavelengths of lights—between the dielectric layers (stack). Chirped mirrors are used in applications like lasers to reflect a wider range of light wavelengths than ordinary dielectric mirrors, or to compensate for the dispersion ...
Hoekstra, P. and A. Delaney, 1974. "Dielectric properties of soils at UHF and microwave frequencies". Journal of Geophysical Research 79:1699–1708. Smith, P., C. Furse, and J. Gunther, 2005. "Analysis of spread spectrum time domain reflectometry for wire fault location". IEEE Sensors Journal 5:1469–1478. Waddoups, B., C. Furse and M ...
Inside a lossless dielectric (the usual case), E and H are in phase, and at right angles to each other and to the wave vector k; so, for s polarization, using the z and xy components of E and H respectively (or for p polarization, using the xy and −z components of E and H), the irradiance in the direction of k is given simply by EH/2, which ...
If a dielectric material does not include light-absorbent additive molecules (pigments, dyes, colorants), it is usually transparent to the spectrum of visible light. Color centers (or dye molecules, or "dopants") in a dielectric absorb a portion of the incoming light. The remaining frequencies (or wavelengths) are free to be reflected or ...
Biomedical sensors working in the microwave range relies on dielectric spectroscopy to detect changes in the dielectric properties over a frequency range, such as non-invasive continuous blood glucose monitoring. [37] [38] The IFAC database can be used as a resource to get the dielectric properties for human body tissues. [39]
The term "spectroscopic" relates to the fact that the information gained is a function of the light's wavelength or energy (spectra). The technique has been known at least since 1888 by the work of Paul Drude [1] and has many applications today. The first documented use of the term "ellipsometry" was in 1945. [2] [non-primary source needed]