Optical transmission and reflection spectra of monocrystalline zinc oxide (ZnO) plates implanted with 40 keV Co⁺ ions to high doses of (0.5–1.5)·10¹⁷ cm^–2 are presented. With increasing dose, the transmission value decreases and the optical transmission edge shifts towards the long-wavelength region in transmission spectra. Also, in the transmission spectra, three absorption bands are observed in the range of 550–680 nm. The bands and their positions are typical of optically active Co²⁺ ions in the zinc cation substitution positions in the ZnO matrix. The reflection coefficient of the implanted side of the ZnO plate increases monotonically with increasing dose values. In both the initial and implanted ZnO plates, when reflection spectra are recorded from the reverse (nonirradiated) side, a characteristic structure at l = 375 nm is observed due to exciton reflection. Modeling of light transmission and reflection in cobalt-implanted ZnO samples was carried out within the framework of a three-layer model, in which the first surface layer contains cobalt nanoinclusions, the second, deeper layer is a solid solution of cobalt ion substitution in the ZnO matrix, the third layer is the unirradiated part of the ZnO plate. Modeling was used to determine effective refractive indices of two ZnO layers containing implanted cobalt admixture in different phase states.

中文翻译：

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高剂量钴离子注入的氧化锌的透射和反射光谱

给出了高剂量（0.5–1.5）·10 ¹⁷ cm ^–2注入40 keV Co ⁺离子的单晶氧化锌（ZnO）板的光透射和反射光谱。随着剂量的增加，透射值减小，并且光透射边缘在透射光谱中向长波长区域移动。同样，在透射光谱中，在550-680 nm范围内观察到三个吸收带。带和它们的位置是光学活性Co ^2+的典型特征ZnO基体中锌阳离子取代位置的离子。ZnO板注入侧的反射系数随剂量值的增加而单调增加。在初始和注入的ZnO板中，当从反面（未照射）记录反射光谱时，由于激子反射，在l = 375 nm处观察到特征结构。在三层模型的框架内对植入钴的ZnO样品中的光透射和反射进行建模，其中第一层表面包含钴纳米夹杂物，第二层更深的层是钴离子置换中的固溶体。 ZnO基质，第三层是ZnO板的未辐照部分。