A preliminary bio-mimetic optical enclosure for enhanced light redistribution in small photovoltaic systems

Bio-inspired optical systems have recently gained attention for their potential applications in low-cost renewable energy technologies. In this preliminary study, we investigate a frugal biomimetic optical enclosure inspired by the internal light-management behaviour of plant leaves specifically, the role of diffuse scattering within the spongy mesophyll layer in redistributing incident photons across the leaf interior. The proposed setup uses inexpensive and readily accessible materials: bubble wrap (as a diffusive scattering medium), reflective aluminium foil paper (as a photon-redirecting boundary lining), transparent plastic sheet (as an optical interface layer), and a commercially available miniature photovoltaic panel. Three optical configurations were studied comparatively under outdoor sunlight conditions. Due to limited access to electrical characterisation equipment, a spatial optical-response proxy defined as the diameter of the illuminated circular region projected onto a reference surface placed below the enclosure was used as a qualitative indicator of relative optical redistribution behaviour. The modified biomimetic enclosure produced an illuminated-region diameter of approximately 14.5 cm compared to 11.3 cm for the unmodified baseline, corresponding to a relative increase of approximately 28% in this proxy metric. The observed improvement is hypothesised to arise from enhanced diffuse photon scattering, reflective boundary confinement, and increased effective optical path length within the enclosure. This work is explicitly exploratory and qualitative; no direct claim of photovoltaic efficiency improvement is made. The results suggest that ultra-low-cost biomimetic optical structures merit further investigation as accessible educational tools and as a starting point for frugal light-management research in small photovoltaic systems.