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What is function of photodetector?
The function of a photodetector is to detect the intensity of laser light and take that information and transfer it to a format usable by other products. A photodector transfers the information into electrical energy.
What is a photodector?
I think you mean photodetector. It is is a sensor of light or other electromagnetic energy.
What does photo mean?
Photo Means Light. It is also a Greek root.Here are some words that start with photo: Photography, photocells, photocopy, photodetector, photoduplicate
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What is the role of the laser in an AFM experiment?
The most common use of a laser in an Atomic Force Microscope (AFM) is to generate a coherent beam of light that is reflected from the back of the AFM probe and onto a photodetector. As the AFM cantilever moves up and down, or twists left and right, the reflected beam traverses the photodetector creating a change in the voltage output from the segments (quadrants) of the photodetector. This difference signal is normalized to the total voltage output (the “sum”) and that normalized difference value is used as a measure of the degree of vertical deflection of the AFM probe. The coolest part of this system is the incredible sensitivity achieved by the laser behaving like a mechanical lever. Tiny motions of the AFM probe result in much larger motions of the laser traversing the photodetector. In this way one can measure nanoscale topographical changes or picoNewton forces on a surface. Lasers can also be used in the AFM to: cause thermal bending of AFM cantilever for remote mechanical control. heat the cantilever for thermal effects.
How does photo detector work?
the energy of light goes to electron movement through electron holes created by raising the energy of the metal in photodetector with the light.
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