A proximity sensor device, which may detect the presence of external objects at close proximity is disclosed. The proximity sensor device may comprise an emitter, a detector, a separation wall and an internal channeling section. In one embodiment, the internal channeling section may be configured to direct light from the emitter to the detector when the external object is present at close proximity. In other embodiments, a proximity sensor assembly, an optical structure and an electronic device having similar internal channeling section are disclosed.