Fabrication of polymeric micro-resonators with nanodiamonds for quantum information technologies

• Grant number: 20/08715-2
• Support type: Scholarships in Brazil - Doctorate (Direct)
• Effective date (Start): September 01, 2020
• Effective date (End): April 30, 2024
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal researcher: Cleber Renato Mendonça
• Grantee: Filipe Assis Couto
• Home Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated research grant: 18/11283-7 - Nonlinear photonics: spectroscopy and advanced processing of materials, AP.TEM

Abstract

To achieve the integration of quantum information technologies in photonic devices, it is necessary to combine resonant microstructures and waveguides in a single three-dimensional (3D) platform. The diamond is a material of interest to be incorporated in such devices, because defects inserted in its crystalline structure present phenomena that make it promising as a matrix for the elements that act as qubits. Among such defects, the nitrogen vacancy centers (NV-) are of particular interest, which act as single photon emitters that have spin states that can be manipulated and read optically at room temperature. Thus, the incorporation and precise control of the location of NV- centers are extremely important in the manufacture of such devices. In line with these interests, the present doctoral research project aims to use the photopolymerization technique by absorption of two photons (A2F) for the manufacture of optical microcavities, to which nanodiamonds with NV centers will be incorporated. Initially, the methodology for the incorporation of nano-diamonds in structures manufactured via A2F and their characterization will be developed. Then, resonant microstructures will be produced that support Whispering Gallery Modes (WGMs), whose confinement results in microcavities of high quality factor and low modal volume. By manipulating the parameters of such microstructures so as to be resonant with the fluorescence emitted by the color centers, we hope to confine and amplify the emitted signal, further advancing towards a device capable of processing quantum information. (AU)