Some of the biggest neutrino experiments in the world, as the Deep Underground Neutrino Experiment (DUNE), are going to address some important questions which are still open in particle physics. One of the most exploited techniques to detect neutrinos is the one of liquid argon time projection chambers (LArTPC) and the detection of its scintillation light represents a very important part of the experimental technique. In this context, ARAPUCA is a totally innovative device, developed by a Brazilian group, which has been designed to improve the collection and detection efficiency of the photons produced by the interaction of particles with liquid argon atoms inside the LArTPC. This device has a very simple design and it is made basically of highly reflective materials and a Dichroic filter combined with two wavelength shifters (WLS) in a way that photons are allowed to enter but not to leave the equipment. Once the photon is trapped inside ARAPUCA, it will be reflected until it is collected by a Silicon Photomultiplier (SiPM). The data analysis and the study of ARAPUCA’s geometry through Monte Carlo simulations aimed to help to answer what is the best setup to optimize the apparatus efficiency, for example, what is the best geometry and material of the device and the number and positions of the SiPMs.