The use of aplanatic solid immersion lenses (ASILs) made of high-refractive-index optical materials provides a route to wide-field high-resolution optical microscopy. Structured illumination microscopy (SIM) can double the spatial bandwidth of a microscope to also achieve high-resolution imaging. We investigate the combination of ASILs and SIM in fluorescence microscopy, which we call structured illumination solid immersion fluorescence microscopy (SISIM), to pursue a microscopic system with very large NA and high lateral resolution. We demonstrate that the combination can produce a wide-field high-resolution microscopic system with bandwidth corresponding to an NA of 3. Future developments of the SISIM system to make it achieve even higher resolution are proposed.
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