Solar Thermal Receiver
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United States of America Patent
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Oct 3, 2014
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Oct 4, 2013
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Abstract
The invention relates to solar thermal receiver for a solar thermal energy plant comprising a light absorber (11) comprising nanoparticles (13) in a host material (15) which is transparent in an absorbing range of the light absorber (11) and where the nanoparticles (13) ekhibit plasmonic resonances within the absorbing range of the light absorber (11), wherein the dispersion of the nanoparticles (13) in the host material is controlled in such a way that the mean distance between said nanoparticles (13) is lower than the wavelengths of light in the absorbing range of the light absorber (11) for generating near field radiation interactions between said nanoparticles (13). The size and the distribution of the nanoparticles (13) is chosen to obtain a cutoff wavelength, where light of higher wavelength than the cutoff wavelength is less absorbed than light at shorter wavelengths with respect to the cutoff wavelength reducing losses due to infrared radiation of the absorber.
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