Ultrafast nanophotonics: harnessing light and manipulating matter through femtosecond multidimensional spectroscopies Abstract – Ultrafast manipulation of light-matter interactions in photonic nano-architectures has unlocked unprecedented opportunities in the field of nanophotonics, ranging from high speed signal processing to the control of photophysical material functionalities. Especially, using optical means, e.g. femtosecond laser light pulses, to actively drive