Wide field-of-view lensless fluorescence imaging device with hybrid bandpass emission filter

We demonstrate a highly sensitive lensless fluorescence imaging device with a wide field-of-view by using a hybrid bandpass filter composed of interference filters, an absorption filter, and a fiber optic plate. The hybrid filter shows high excitation light rejection characteristics even in a lensless setup. In this study, we fabricated a hybrid bandpass filter and improved fluorescence observation performance for a target with auto-fluorescence. The filter was combined with a large image sensor with an imaging area of 67 mm2. As a demonstration, a brain slice from a green fluorescent protein transgenic mouse was observed and fluorescent cell bodies were detected with the lensless imaging device.