Erasable optical data storage in diamond with room temperature read-out and other photochromic and thermochromic properties of diamond

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• 作者：John Steeds^a ; Wang Kaiyue^a ; ^b ; ^{wangkaiyue@tju.edu.cn} ; Li Zhihong^b ; ^{phzkw@bristol.ac.uk}
• 关键词：Photochromic ; Thermochromic ; Electron-irradiation ; Diamond
• 刊名：Diamond and Related Materials
• 出版年：2012
• 期刊代码：30_09259635
• 类别：ms
• 出版时间：March, 2012
• 卷：23
• 期：Complete
• 页码：154-156
• 文件大小：263 K

摘要

A technique previously employed to investigate photochromic effects in 4H SiC has now been applied to various high pressure and high temperature (HPHT) and chemical vapour deposition (CVD) diamond samples. After electron irradiation with 250-300 keV electrons the irradiated region is first investigated for uniformity of defects created by low-temperature (7 K) microscopic photoluminescence (PL) using a 488 nm laser. It is then subjected to an intense focused 325 nm laser beam in a square raster of points with 40 渭m spacing and finally re-examined with 488 nm excitation. Periodic changes of the intensities of particular optical centres identify photochromic behaviour. The samples studied by this technique were low-nitrogen CVD and HPHT samples and a boron doped HPHT sample. The restoration of photochromically quenched centres by thermal annealing has also been investigated.