Physics Colloquium: Dr. Angika Bulbul, "Imaging Through Unusual Apertures by Advanced Digital Methods and 3D Tracking Comparison of a Refractive vs. a Geometric Phase Plate"
Thursday, October 24, 2024 4pm to 5pm
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2090 Eure Dr., Winston-Salem, NC 27106
https://physics.wfu.edu/wfu-phy-news/colloquium/seminar-fall-2024/ #colloquium, seminarThe talk will present methods to resolve the challenges faced in classical optics with a full aperture imaging system by utilizing unusual apertures with the method of incoherent digital holography. The development of superresolution imaging techniques that provide similar resolution with a fraction of aperture area as low as 1.4% and 0.48% of the total aperture area using partial and synthetic aperture (SA) imaging will be discussed. We developed a novel singlechannel incoherent SA by implementing a single opening instead of two and it solves a core problem of SA with multiple channels in the optical regime will be reviewed. These research attempts to provide an alternative to the large and bulky reflective mirrors or refractive/diffractive lenses commonly used in space-based, or ground-based telescopes. These techniques inspire a new generation of telescopes that can be lightweight, smaller in size, and cost-effective, while at the same time delivering a similar resolution to that from a large SA telescope system with 3D capabilities. The second part of the talk will be on tracking biological objects in three dimensions (3D) for a better understanding of the dynamic behavior of cellular components. It can be achieved by multifocal imaging with diffractive optical elements (DOEs) converting depth (z) information into a modification of the 2D image. A quantitative comparison of the performance of a DOE (3rd-generation refractive phase plate (RPP)) to a 4thgeneration multifocal element that is a geometric phase plate (GPP) will be presented.
https://drive.google.com/file/d/1HhLp6dzxKf3XBAn-iUcuGUSRL2O8L2QD/view?usp=sharing
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