  The Substellar Initial Mass Function (SIMF) of many star-forming regions is
still poorly known but the detailed knowledge of its shape will help to
distinguish among the substellar formation theories. The Orion Nebula Cluster
(ONC) is one of the most extensively studied star forming regions. We here
present deep, wide-field JHK observations of the ONC taken with HAWK-I@VLT.
These observations extend the IMF into the brown dwarf and free-floating
planetary mass regime with unprecedented sensitivity. To obtain a clean sample
of ONC members, we exclude potential background sources with the help of CO
extinction maps. Masses are assigned by means of evolutionary tracks in the H
vs. J-H Color-Magnitude Diagram (CMD). Besides the well known stellar peak at
~0.25 M_sun we find a pronounced second peak at ~0.04 M_sun in the SIMF and
indications for a third rise in the free-floating planetary mass regime.
