Enhorabona a la nova graduada de doctorat de l'ICFO
La Dra. María Hernández Ruiz s’ha doctorat amb una tesi titulada “Cavity-Enhanced, Optically Pumped Magnetometry and its Miniaturization”
Felicitem la Dra. María Hernández Ruiz que aquesta tarda ha defensat la seva tesi a l'Auditori de l'ICFO.
La Dra. Hernández Ruiz va obtenir el Màster en Optical Fiber and Photonic Engineering per la University of Southampton, i es va unir a l'equip d'investigació Atomic Quantum Optics dirigit pel professor Dr. Morgan Mitchell. La seva tesi titulada “Cavity-Enhanced, Optically Pumped Magnetometry and its Miniaturization” va ser dirigida pel professor Dr. Morgan Mitchell i pel professor Dr. Vito Giovanni Lucivero.
RESUM:
This thesis presents the development and experimental implementation towards a miniaturized cavity-enhanced atomic magnetometer designed for high sensitivity and high spatial resolution. The proposed technique relies on a cavity-based optical readout of atomic polarization using the Pound Drever Hall technique.
The magnetometer was experimentally realized and characterized, including a design compatible with biological measurements. The magnetometer can operate with one endcap open in a weak shielding environment (only only layer of mu-metal.) The system was applied to the study of magnetotactic bacteria, whose magnetic response arises from the alignment and relaxation dynamics of intracellular magnetosome chains. Time resolved measurements of the magnetic signal were analyzed assuming exponential relaxation. Furthermore, the model was expanded using a stochastic model to detect deviations from exponential behavior associated with sample evaporation.
The achieved sensitivity and stability of the magnetometer enabled the reliable detection of magnetic signals on the nanotesla scale, with a sensing characteristic length Lat=1.5 mm. These results demonstrate the potential of cavity-enhanced atomic magnetometry for the investigation of biological magnetic systems. This work establishes a versatile platform for high-sensitivity magnetic measurements and opens promising perspectives for future applications in biophysics and magnetic microscopy.
Tribunal de Tesi:
Prof. Dr. Rosario González Ferez, Universidad de Granada
Prof. Dr. Hugues De Riedmatten, ICFO
Prof. Dr. Anne Fabricant, Physikalisch-Technische Bundesanstalt (PTB)