{"ID":2838150,"CreatedAt":"2026-06-01T04:54:23.091178241Z","UpdatedAt":"2026-06-01T04:54:23.091178241Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2511.17860","arxiv_id":"2511.17860","title":"A Versatile Optical Frontend for Multicolor Fluorescence Imaging with Miniaturized Lensless Sensors","abstract":"Lensless imaging enables exceptionally compact fluorescence sensors, advancing applications in \\textit{in vivo} imaging and low-cost, point-of-care diagnostics. These sensors require a filter to block the excitation light while passing fluorescent emissions. However, conventional thin-film interference filters are sensitive to angle of incidence (AOI), complicating their use in lensless systems. Here we thoroughly analyze and optimize a technique using a fiber optic plate (FOP) to absorb off-axis light that would bleed through the interference filter while improving image resolution. Through simulations, we show that the numerical aperture (NA) of the FOP drives inherent design tradeoffs: collection efficiency improves rapidly with a higher NA, but at the cost of resolution, increased device thickness, and fluorescence excitation efficiency. To illustrate this, we optimize two optical frontends with full-width at half maximums (FWHMs) of 8.3° and 45.7°. Implementing these designs, we show that angle-insensitivity requires filters on both sides of the FOP, due to scattering. In imaging experiments, the 520-$μ$m-thick high-NA design is 59$\\times$ more sensitive to fluorescence while only degrading resolution by 3.2$\\times$. Alternatively, the low-NA design is capable of three-color fluorescence imaging with 110-$μ$m resolution at a 1-mm working distance. Overall, we demonstrate a versatile optical frontend that is adaptable to a range of applications using different fluorophores, illumination configurations, and lensless imaging techniques.","short_abstract":"Lensless imaging enables exceptionally compact fluorescence sensors, advancing applications in \\textit{in vivo} imaging and low-cost, point-of-care diagnostics. These sensors require a filter to block the excitation light while passing fluorescent emissions. However, conventional thin-film interference filters are sens...","url_abs":"https://arxiv.org/abs/2511.17860","url_pdf":"https://arxiv.org/pdf/2511.17860v1","authors":"[\"Lukas Harris\",\"Micah Roschelle\",\"Jack Bartley\",\"Mekhail Anwar\"]","published":"2025-11-22T01:11:07Z","proceeding":"eess.IV","tasks":"[\"eess.IV\"]","methods":"[]","has_code":false}