Optical fluorescence microscope using point laser illumination and a conjugate spatial pinhole to eliminate out-of-focus light and reconstruct 3D volumes.
Specifications & Metrics
measures
Subcellular 3D protein localization, live-cell calcium/FRET dynamics, and high-content organoid imaging
Core Principles & Analysis
Built in 1955 and patented in 1957 by Marvin Minsky, the confocal microscope places a spatial pinhole aperture in an optically conjugate focal plane in front of the photodetector to reject out-of-focus background fluorescence.
Scanning a diffraction-limited laser spot across the specimen in X–Y planes at serial Z-depths ("optical sectioning") allows three-dimensional reconstruction of thick tissues, cerebral organoids, and subcellular organelles without physical sectioning.
Spinning-disk confocal systems (enhanced with dual Nipkow/microlens disks invented by Yokogawa Electric in 1992) sweep thousands of pinholes simultaneously to capture fast live-cell calcium transients, vesicle trafficking, and receptor endocytosis with minimal photobleaching.