To my grandparents Aniceto and Clara, and to loving memory of my grandparents Marcelino and Teresa this humble work is a sign of my love to you. First, I would like thank my advisor Prof. Dr. Sérgio Muniz, for his support from day one to this project and my scientific career. His encouragement always gave me the confidence and energy to finish this project. He also allowed me a lot of flexibility and freedom so that I can become an independent researcher. I am thankful for his kindness, patience, friendship, and support throughout these years. I wish to thank Prof. Dr. Francisco Guimarães for the help with analysis the photoluminescence of the NV center and sharing his knowledge on using the confocal microscope. The discussions were of extreme relevance.
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