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Laser-induced refractive index changes in nanocrystalline diamond membranes

机译:激光诱导的纳米晶金刚石膜的折射率变化

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We have observed what we believe to be a new phenomenon in nanocrystalline diamond membranes. Thenoptical thickness of the membrane is changed under laser irradiation, which leads to a spectral shift of interferencenfringes in the transmission and photoluminescence spectra of high-quality thin self-supportingnnanocrystalline membranes. The direction of the spectral shift (red/blue) can be tuned by the ambient airnpressure. The effect is reversible and is accompanied by changes in photoluminescence intensity. We interpretnthe results in terms of the changes in the index of refraction caused by the photoinduced adsorptiondesorption of air molecules that subsequently affect the properties of subgap energy states related to thensurface and the grain boundaries of the nanocrystals. © 2010 Optical Society of America
机译:我们已经观察到我们认为是纳米晶金刚石膜的一种新现象。然后在激光辐照下改变膜的光学厚度,这导致高质量薄的自支撑纳米晶体膜的透射和光致发光光谱中的干涉条纹发生光谱偏移。光谱偏移的方向(红色/蓝色)可以通过环境气压来调整。这种作用是可逆的,并伴有光致发光强度的变化。我们用空气分子的光诱导吸附/解吸引起的折射率变化来解释结果,该变化随后影响与纳米晶体的表面和晶界有关的亚能隙能态的性质。 ©2010美国眼镜学会

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