Spectral selection

One of the attractive features of single mode waveguides is their ability to filter the spatial field distribution. All the wavefront aberrations only result in a photometric fluctuation easy to monitor. It results in a very good calibration of the interferometric data as firstly demonstrated by FLUOR, as seen in Fig. 8 (Coude du Foresto et al., 1998). Nevertheless, care has to be taken to keep in mind that turbulence may have a spectral selectivity in the launching pro-... 

Xu, X., Gibbons, T. and Cortie, M.B. (2006) Spectrally-selective gold nanorod coatings for window glass. Gold Bulletin, 39, 156-165. 

To make a breakthrough in household appliances and other consumer product markets UV sensors have to become significantly cheaper while spectral selectivity as a major key feature must be guaranteed. Most of today s UV photodiodes are made from crystalline semiconductor materials. The cheaper materials (Si) lack spectral selectivity, and the wide band gap materials are very expensive. What they all have in common their top performance regarding sensitivity and speed. Crystalline photodiodes have risetimes of often below 1 s. However, the described processes to be sensed here are not faster than some milliseconds or even much slower. In order to obtain a reasonably-priced SiC or GaN photodiode, the photoactive area is often reduced to below 1 mm2 and barely fills the sensor housing. So far, the top sensitivity offered by the semiconductor has been sacrificed for a competitive... 

Electrochemical systems, 9 606 in industrial processes, 9 615 Electrochemical techniques, for spectrally selective surfaces, 23 12-13 Electrochemical Technology Business electrolysis cells, 9 668-669 Electrochemical transducer, 3 408 Electrochemical vapor deposition (EVD), 72 225... 

Luminescence Lidar (light Detection and Ranging) is an active instrument, which sends out coherent waves to the object concerned. A fraction of the transmitted energy is transformed by the objects and sends back to the sensor. lidar instriunents measure both the traveUng time interval between sensor/object/sensor as well as the difference between emitted and returning energy, providing information on the exact position of the objects and on the material the objects are made of. Spectral selectivity was achieved usually with the aid of narrow band interference filters. 

Enhancement of the Hght-matter interaction in a microscopic optical cavity is achieved because Hght trapped in the cavity has longer effective interaction time with absorbers. For short laser pulses, cavity length exceeding CTp allows avoidance of the interference between the pulses incident and reflected from the mirrors. Spectral selectivity of planar Fabry-Perot cavities can be used to achieve the localization at the resonant wavelength of the cavity. 

The idea of photoionization spatial localization of the molecular bonds or chromophore of a large molecule based on a combination of spectrally selective photoionization of a chosen bond or chromophore of the molecule with electron or ion microscopy is shown on Fig. 1 for a particular case of projective microscopy. A hemispherical tip of a needle with a radius of curvature... 

Figure 1. (a) Schematic diagram of a laser photoion projection microscope and (b) spectrally selective multistep photoionization scheme for absorbing centers (color centers, molecular chromophores, etc.) by ultrashort laser pulses. 

Many technical applications require high radiant power, which cannot be furnished by an operationally reasonable number of lamps having otherwise optimal emission characteristics. Examples of this situation are mostly found in applications oTthe 254-nm fine, where a number of low-pressure mercury lamps may be replaced by one medium-pressure mercury arc. This substitution represents a compromise where spectral selectivity and energy wasting (VIS and IR radiation) is traded against a compact production unit which is less expensive (number of reactors, quartz, safety requirements) and easier to operate (number of reactors, space, and overview). 

Absorption conditions of the reaction system or spectral selectivity of... 

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