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Abstract
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The dramatic advances of nanotechnology experienced in recent years enabled us to fabricate optical nanostructures or
nano-antennas that greatly enhance the conversion of localised electromagnetic energy into radiation and vice versa. Nanoantennas
offer the required improvements in terms of bandwidth, interaction strength and resolution for combining ultrafast
spectroscopy, nano-optics and quantum optics to fundamentally push forward the possibility of the coherent optical access on
individual nanostructures or even molecules above cryogenic temperatures, where dephasing processes typically occur at very
short time scales. In this context, we discuss recent progress in the theoretical description of light-matter interaction at the
nanoscale and related experimental findings. Moreover, we present concrete examples in support of our vision and propose
a series of experiments that aim at exploring novel promising regimes of optical coherence and quantum optics in advanced
spectroscopy. We envisage extensions to ultrafast and nonlinear phenomena, especially in the direction of multidimensional
nanoscopy.
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