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Making an omnidirectional reflector

机译:制作全向反射器

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The effect of having a finite number of layers on the design of omnidirectional reflectors was investigated. It was shown that the structure should be finished with a low-index layer having a thickness larger than a quarter-wave to increase reflectivity, whereas layers below may remain of quarter-wave optical thickness at normal incidence angle. This general trend has been used for designing and realizing two a-Si-SiO_(2) (amorphous silicon and silicon dioxide) omnidirectional reflectors in the near-infrared range on a silicon and a silica substrate, respectively. Owing to the decrease of absorption of recrystallized silicon as compared with a-Si in the visible range, the transmissivity of the structure realized on silica substrate was dramatically increased in the visible range upon annealing, whereas the high reflectivity and the omnidirectional effect were maintained in the near-infrared range.
机译:研究了具有有限数量的层对全向反射器设计的影响。已经表明,该结构应该用厚度大于四分之一波的低折射率层来完成,以增加反射率,而下面的层在法向入射角处可能保持四分之一波光学厚度。该总体趋势已被用于设计和实现分别在硅和二氧化硅衬底上的近红外范围内的两个a-Si-SiO_(2)(非晶硅和二氧化硅)全向反射器。由于在可见光范围内与a-Si相比,重结晶硅的吸收率降低,退火后在可见光范围内,二氧化硅衬底上实现的结构的透射率显着提高,而在高温下则保持了高反射率和全向效应。近红外范围。

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