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| Author(s): |
Filipe Assis Couto
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT) |
| Defense date: | 2024-06-17 |
| Examining board members: |
Cleber Renato Mendonça;
Thiago Pedro Mayer Alegre;
Sérgio Ricardo Muniz;
Antonio Riul Junior;
Nathalia Beretta Tomazio
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| Advisor: | Cleber Renato Mendonça |
| Abstract | |
Color centers have attracted significant attention for their applications in quantum technology, making their integration into photonic structures an essential area of research to advance the realization of quantum platforms. In particular, resonant cavities offer a promising platform for enhancing the light-matter interaction of color centers. This work explores the fabrication of microcavities embedded with fluorescent nanodiamonds using two-photon polymerization (2PP). We investigate the trade-off between nanodiamond concentration in the photoresist and the resulting structural quality and cavity Q-factor. Our results demonstrate the successful integration of nanodiamonds into cylindrical cavities doped with 0.002 wt% concentration. These cavities maintain good quality factors on the order of 105 and contain one to three fluorescent color centers. The position of the fluorescent nanodiamonds within the microcavities is confirmed using fluorescence spectroscopy, laser scanning microscopy (LSM), and Raman spectroscopy. Additionally, utilizing Finite-Difference Time-Domain (FDTD) simulations, we explore novel designs for efficient emitter-cavity coupling with color centers in 4H-Silicon Carbide (SiC) nanostructures. We optimized a double nanobeam cavity design supporting high-quality factor resonances and a \"sawfish\" cavity design for improved fabrication and light-matter interaction with color center in SiC. Building upon this knowledge, we discuss future directions for leveraging 2PP fabrication to integrate nanodiamonds with novel Whispering Gallery Modes (WGM) cavities, aiming at achieving low mode volumes to explore the Purcell effect. Therefore, this research paves the way for developing integrated devices containing nanodiamonds and WGM cavities for quantum technology applications. (AU) | |
| FAPESP's process: | 20/08715-2 - Fabrication of polymeric micro-resonators with nanodiamonds for quantum information technologies |
| Grantee: | Filipe Assis Couto |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |