de Jong Ties M, de Boer Dick K G, Bastiaansen Cees W M
Functional Organic Materials & Devices, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands.
Opt Express. 2011 Aug 1;19(16):15127-42. doi: 10.1364/OE.19.015127.
Transmission gratings that combine a large diffraction angle with a high diffraction efficiency and a low angular and wavelength dispersion could be used to collect sunlight in a light guide. In this paper we compare the diffractive properties of polarization gratings and classical surface-relief gratings and explore their possible use in solar concentrators. It is found that polarization gratings and surface-relief gratings have qualitatively comparable diffraction characteristics when their thickness parameters are within the same regime. Relatively large grating periods result in high diffraction efficiencies over a wide range of incident angles. For small grating periods the efficiency and the angular acceptance are decreased. Surface-relief gratings are preferred over polarization gratings as in-couplers for solar concentrators.
能将大衍射角与高衍射效率以及低角度和波长色散相结合的透射光栅可用于在光导中收集太阳光。在本文中，我们比较了偏振光栅和经典表面浮雕光栅的衍射特性，并探讨了它们在太阳能聚光器中的可能用途。研究发现，当偏振光栅和表面浮雕光栅的厚度参数处于相同范围时，它们具有定性可比的衍射特性。相对较大的光栅周期会在很宽的入射角范围内产生高衍射效率。对于小光栅周期，效率和角度接受度会降低。作为太阳能聚光器的入射耦合器，表面浮雕光栅比偏振光栅更受青睐。
