[2] Küpper is best known for his pioneering work on the control of complex neutral molecules, including the spatial separation of structural isomers and their laser-alignment and mixed-field orientation.
He develops novel techniques to control the external and internal degrees of freedom of neutral molecules and exploits these well-defined samples in experiments to image their nuclear and electronic structure and dynamics.
[3] In 2009, he received the habilitation in experimental physics for his work on the control of large, neutral molecules at Free University Berlin.
[3] He then became project leader in the Department of molecular physics at the Fritz Haber Institute of the Max Planck Society in Berlin-Dahlem, Germany.
[3] Küpper has received several awards, including the prestigious Nernst Haber Bodenstein Prize of the German Bunsen-Society for Physical Chemistry in 2009,[4] and an ERC Consolidator Grant in 2013.