Speaker
Description
Low-dimensional material structures—such as polyacetylenes and graphene nanoflakes—can function as tunable photonic nanoantennas, offering powerful means to tailor the optical response of nearby atomic systems. Unlike conventional mesoscopic nanoantennas, nanoflakes support a variety of optical resonances, arising from both single-particle excitations and collective modes [1]. In this work, we explore how the nature of these resonances influences the optical response of proximate atomic emitters [2].
Due to the extreme spatial confinement of optical excitations in graphene, effective photonic enhancement demands that the atomic system be placed in close proximity to the nanoflake. At such distances, electron tunnelling between the atom and the nanoantenna becomes possible, introducing a non-negligible electronic back-action that further modifies the nanoflake’s optical properties.
We systematically characterize the interplay between optical and electronic couplings and their combined effect on fundamental light–matter interaction phenomena, including coherent coupling and Purcell-enhanced fluorescence. Our analysis uncovers two distinct interaction regimes, determined by the atom–antenna separation, each marked by qualitatively different dynamics [3].
[1] Energy-based plasmonicity index to characterize optical resonances in nanostructures, M.M. Müller, et al., The Journal of Physical Chemistry C 124 (44), 24331-24343 (2020)
[2] A. Ghosh et al., in preparation
[3] Revising quantum optical phenomena in adatoms coupled to graphene nanoantennas, M. Kosik et al., Nanophotonics 11 (14), 3281-3298 (2022)
