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Optical Microscope; • Scanning Electron Microscope (SEM ...

Lecture 3 Brief Overview of Traditional Microscopes Optical Microscope ; Scanning Electron Microscope (SEM); Transmission Electron Microscope (TEM); Comparison with Scanning probe Microscope (SPM) General philosophy Human beings use two kinds of means to gauge objectives: Seeing --- through eyes (light) Optical Microscope electronic Microscope (higher resolution due to short wavelength); Touching --- through hands (probe) SPM. Converting wavelength (nm) to Electron energy (eV): (nm), for example, a 500 nm light corresponds to = eV Principles of an Optical Microscope Development of Microscope takes us back to 400 years ago Robert Hooke s "Micrographia" (1665) A hair knot Room dusts Red blood cell Flu virus Organic nanobelts with strong emission Advantages and Disadvantages of Optical Microscope Advantages: Direct imaging with no need of sample pre-treatment, the only microscopy for real color imaging.

• The German physicist Ernst Ruska and the electrical engineer Max Knoll constructed the prototype electron microscope in 1931, capable of four-hundred-power magnification; the ... radiation can be in the form of ions, electrons, or photons with sufficiently high energy, i.e.

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