25 avenue des martyrs - Grenoble
2D solids : optical spectroscopies and nano-optomechanics
Antoine Reserbat-Plantey (ICFO Barcelone)
Recent advances in optomechanics have led to outstanding discoveries. For instance, a macroscopic object (a mechanical resonator) has been cooled and measured in its quantum ground state of motion [1-2]. This technological and scientific challenge uses mechanical elements to measure weak forces and explore the interface between classical and quantum worlds. In parallel, atomically thin  (ex : graphene, transition metal dichalcogenides (TMD) MoS2, WSe2) have been integrated in various electronic, optical and mechanical devices. These objects are fascinating for both fundamental (electronic properties, cristal-molecule interface…) and applied aspects (soft electrodes, photo-detectors…). By combining these two domains, we envision optomechanics experiments in which the low dimensionality of the mechanical element will be an advantage (high frequency, ultra-low mass, enhanced optomechanical coupling) and an originality (electronic confinement, tunable light-matter interaction).
In this talk I will first show how to detect motion and mechanical stress within a graphitic resonator using Raman spectroscopy . Such detection scheme, based on the increase of mechanical stress at resonance, link the mechanical motion of the resonator, to a shift in energy of Raman scattered photons, and represents an original scheme for optomechanical coupling.