Microscopic Dynamics of Atomic Oxygen Reactions with Aromatic Molecules: From High-T. Chemistry to Astrochemical Environments

Abstract

Color centers in wide band gap semiconductors are a key building block for quantum photonics and sensing. In this talk, I will present an overview of the activities of our group at FBK, historically focused on the fabrication and characterization of diamond color centers, with ion beam implantation as the core enabling technology. Our approach primarily relies on focused ion beam (FIB) implantation to achieve deterministic control over the spatial localization, depth, and density of optically active defects. We demonstrate the controlled creation of single-photon emitters and emitter clusters, namely silicon- and germanium-vacancy (SiV and GeV) centers, with nanometric spatial accuracy. Using both focused and broad-beam technologies, we also engineer shallow color centers extending into the near-surface regime, including NV centers, which are crucial for sensing applications. I will further present the integration of color centers within photonic microstructures, enabling enhanced light–matter interaction and efficient photon extraction. To complete the overview, beyond defect creation, we exploit ion-beam-induced collateral effects, such as lattice amorphization and graphitization upon thermal annealing, as functional tools for diamond integration. Furthermore, we exploit FIB processing of thin diamond lamellae, tailored for scanning probe and nanothermometry applications. Overall, our work establishes focused ion beam irradiation as a versatile and deterministic tool for engineering both quantum emitters and functional architectures, paving the way toward scalable diamond-based quantum technologies. I will conclude the talk by briefly mentioning our first preliminary results on color center fabrication in silicon carbide.

Chi è Gianmarco Vanuzzo ?

Gianmarco Vanuzzo is a postdoctoral researcher in physical chemistry at the University of Perugia, working in the group of Prof. Nadia Balucani. His research focuses on experimental studies of bimolecular reaction dynamics in the gas phase using crossed molecular beams. His work addresses fundamental reaction mechanisms relevant to high-temperature chemistry, astrochemistry, and materials degradation in extreme environments, including low Earth orbit conditions. He has extensive experience in high-vacuum instrumentation, mass spectrometry, and the study of reactive species such as atomic oxygen and radicals. He has served as principal investigator for experiments at synchrotron facilities, where he investigated ion–molecule reactions under controlled conditions. He has also presented his research at several international conferences, including invited lectures on gas-phase oxidation chemistry in astrochemical and high-temperature environments.

A Quantum of Matter

“A Quantum of Matter” is an event dedicated to research in Physics of Matter carried out in our Department. The aim of “A Quantum of Matter” is to develop synergies and collaborations between groups. For this reason, the seminars will focus not only on the results obtained, but also on the techniques used and possible topics that could be developed in collaboration, leaving ample room for discussion and debate.