BEGIN:VCALENDAR VERSION:2.0 X-WR-CALNAME:EventsCalendar PRODID:-//hacksw/handcal//NONSGML v1.0//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York LAST-MODIFIED:20240422T053451Z TZURL:https://www.tzurl.org/zoneinfo-outlook/America/New_York X-LIC-LOCATION:America/New_York BEGIN:DAYLIGHT TZNAME:EDT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 DTSTART:19700308T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU END:DAYLIGHT BEGIN:STANDARD TZNAME:EST TZOFFSETFROM:-0400 TZOFFSETTO:-0500 DTSTART:19701101T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT CATEGORIES:College of Engineering DESCRIPTION:Topic: “Microscopy without lenses: Rethinking illumination, c omputation, and polarization DLHM”  Abstract: Lensless microscopy trade s the objective lens for computation. In digital lensless holographic micr oscopy (DLHM), a point source, sample, and digital camera are sufficient t o record a hologram from which amplitude and phase information can be nume rically retrieved, enabling compact and low-cost microscopy systems. Howev er, achieving reliable quantitative imaging requires careful development o f both the optical hardware and computational methods. In this talk, I wil l review our advances in DLHM from both perspectives. On the hardware side , I will discuss the evolution of illumination from conventional pinhole-b ased systems to holographic optical elements and high-numerical-aperture f reeform illumination, highlighting the tradeoffs among resolution, field o f view, noise, and coherence. I will also present polarization-sensitive a pproaches, including diattenuation and Mueller-matrix imaging, as well as portable systems designed for field applications. On the computational sid e, I will discuss reconstruction, preprocessing, simulation, noise reducti on, and methods for improving image quality. I will also show how deep lea rning can reduce computational requirements by detecting cells directly fr om raw holograms and automatically estimating their focusing distance. Fin ally, I will introduce recent lensless architectures combining off-axis in terferometry and polarization sensitivity. Together, these developments de monstrate the potential of DLHM as a compact, quantitative, and polarizati on-aware imaging platform for laboratory and field applications.  Biograp hy: Carlos Trujillo is a Full Professor at Universidad EAFIT (Medellín, C olombia) in the Fundamental Sciences area. He is affiliated with the Optic s and Photonics Laboratory, and heads the Master's program in Applied Phys ics. He received his Ph.D. in Physics (2018, Summa Cum Laude), M.Sc. in Co mputational Sciences (2013, Magna Cum Laude), and B.Sc. in Engineering Phy sics (2010, top of his class), all from Universidad Nacional de Colombia, Medellín. His research focuses on digital holographic and lensless hologr aphic microscopy. It combines optical design, computational imaging, polar imetry, and deep learning to develop accessible, quantitative microscopes.   The Seminars is open to the public free of charge.  *For further info rmation, please contact Dr. Ana Doblas via email at adoblas@umassd.edu.\nE vent page: https://www.umassd.edu/events/cms/10-23-26-carlos-trujillo-prof essor-eafit-university-colombia.php\nEvent link: https://umassd.zoom.us/j/ 91838904870 X-ALT-DESC;FMTTYPE=text/html:

Topic: “Microscopy without le nses: Rethinking illumination\, computation\, and polarization DLHM” \n

Abstract: Lensless microscopy trades the objective lens for computa tion. In digital lensless holographic microscopy (DLHM)\, a point source\, sample\, and digital camera are sufficient to record a hologram from whic h amplitude and phase information can be numerically retrieved\, enabling compact and low-cost microscopy systems. However\, achieving reliable quan titative imaging requires careful development of both the optical hardware and computational methods. In this talk\, I will review our advances in D LHM from both perspectives. On the hardware side\, I will discuss the evol ution of illumination from conventional pinhole-based systems to holograph ic optical elements and high-numerical-aperture freeform illumination\, hi ghlighting the tradeoffs among resolution\, field of view\, noise\, and co herence. I will also present polarization-sensitive approaches\, including diattenuation and Mueller-matrix imaging\, as well as portable systems de signed for field applications. On the computational side\, I will discuss reconstruction\, preprocessing\, simulation\, noise reduction\, and method s for improving image quality. I will also show how deep learning can redu ce computational requirements by detecting cells directly from raw hologra ms and automatically estimating their focusing distance. Finally\, I will introduce recent lensless architectures combining off-axis interferometry and polarization sensitivity. Together\, these developments demonstrate th e potential of DLHM as a compact\, quantitative\, and polarization-aware i maging platform for laboratory and field applications. 

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Biography : Carlos Trujillo is a Full Professor at Universidad EAFIT (Medellín\, Co lombia) in the Fundamental Sciences area. He is affiliated with the Optics and Photonics Laboratory\, and heads the Master's program in Applied Phys ics. He received his Ph.D. in Physics (2018\, Summa Cum Laude)\, M.Sc. in Computational Sciences (2013\, Magna Cum Laude)\, and B.Sc. in Engineering Physics (2010\, top of his class)\, all from Universidad Nacional de Colo mbia\, Medellín. His research focuses on digital holographic and lensless holographic microscopy. It combines optical design\, computational imagin g\, polarimetry\, and deep learning to develop accessible\, quantitative m icroscopes.  

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The Seminars is open to the public free of charge.  

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*For further information\, please contact Dr. Ana Doblas via em ail at adoblas@umassd.edu.

Event page: https://www.umassd.edu/events/cms/10-23-26-carlos-trujillo-professor -eafit-university-colombia.php
Event link: https://umassd.zoom.us/j/91838904870

DTSTAMP:20261006T214407 DTSTART;TZID=America/New_York:20261023T110000 DTEND;TZID=America/New_York:20261023T120000 LOCATION:Science & Engineering Building (SENG), Room 212 SUMMARY;LANGUAGE=en-us:Microscopy without lenses: Rethinking illumination, computation, and polarization DLHM UID:023a2dd6282649a808c377f1c878e19a@www.umassd.edu END:VEVENT END:VCALENDAR