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Speaker: Dr Alan Blood (ºÚÁÏÍø´óÊÂ¼Ç Sydney)

Title: Dual illumination Fourier modulation microscopy (DIFMM): New and old concepts

Time/Date: 1-2pm Friday 26 September 2025 (AEST)

Location: Ainsworth G02 (ºÚÁÏÍø´óÊÂ¼Ç Sydney)

Abstract: Internal Darkfield microscopy methods employ Fourier stops to block undiffracted zero-order light to generate a Darkfield image. In some cases a brightfield image can be superimposed to soften contrast. This research aims to improve the existing single-source methods by using dual illumination. One method uses a thin strip-stop to block pencil beams at variable angles that can be adjusted using a small sliding mirror, resulting in Darkfield images that have luminous internal detail in the axial position, or higher resolution in the peripheral position. A variety of related new and old methods are also discussed.

Bio: Dr. Alan Blood is an Adjunct Lecturer at ºÚÁÏÍø´óÊÂ¼Ç School of Optometry and Vision Science, presently researching light microscopy innovations involving Fourier Modulation with Dual- and Multiple-Beam Illumination. Alan has a previous background as a cell biologist interested in radiofrequency bio-effects and medical applications.