Gold nanoparticles (GNPs) are attracting tremendous interest in nanotechnology due to their plasmonic properties, in particular the localized surface plasmon resonance effect (LSPR), an optical phenomenon generated by light as it interacts with GNPs, which strongly depends on NPs separation distance and organization. Growing these particles in the presence of wormlike micelles (WLM) results in their structuration, which makes it a promising system for the design of novel materials, with applications in biosensing. We request the use of SANS to elucidate the morphologies formed in mixtures of WLM and GNPs, in order to understand the influence of WLM chains on the formation of nanoparticle aggregates. Contrast variation will be used to alternately highlight micelles or GNPs. This structural information will help extract guiding principles to manipulate GNPs properties by tuning the WLM.