We present our latest results on a structured illumination microscope (SIM) implementation using individual microelectromechanical systems (MEMS) micromirrors with three-axis full angular, radial and phase control of the illumination pattern in the sample. Results of a simultaneous multi-color 2D SIM and 3D SIM implementation are shown with digital system adjustment to select the optimal imaging conditions and adapt to variable microscope objectives used in the system. Calibration and cell images of 2D and 3D samples will be shown to verify the resolution enhancement and axial sectioning potential.
A 3D photoacoustic microscopy (PAM) system is presented and characterized, using optical MEMS and fibre tip transducers as active elements to provide all-optical positioning and read-out. The excitation beam position is controlled using an electrostatically actuated 2-axis MEMS scanner. This allows for fast 3D scanning without motion-induced artefacts caused by stage scanning, and selective imaging of regions of interest. A 20 MHz fibre tip transducer is used for acoustic detection, which allows a variety of sample holders to be used including common approaches such as multi-well plates and petri-dishes.
We present the development and application of a novel structured illumination microscope (SIM) in which the grating pattern is generated using two optical beams controlled via two micro-electro-mechanical system (MEMS) 3D scanning micromirrors, each having static angular and piston control. This arrangement enables the generation of a fully controllable spatial interference pattern at the focal plane by adjusting the positions of the beams in the back-aperture of a high numerical aperture (NA) microscope objective. The utilization of MEMS micromirrors to control angular, radial and phase positioning for the structured illumination patterns has advantages of flexible control of the fluorescence excitation illumination, with achromatic beam delivery through the same optical path, reduced spatial footprint and cost-efficient integration.
In this work, we present the results of using a commercially available SLA printer for the fabrication of a range of designs of optical components. The optical properties are compared to off-the-shelf optics, including a detailed analysis of optical transmission, part uniformity and surface quality. A post-processing refinement step is introduced whose results are benchmarked against off-the-shelf polished glass lensesto exemplify sub-hundred nanometre surface roughness uniformity with minimal surface defects, and transmission properties as high as 85% at 638 nm for a 1 mm thick optical block without anti-reflection coatings
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