Apertureless Near Field Microscope
Apertureless Near Field Microscope - Related Videos
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Major Components of the Light Microscope
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Magnetic Fields
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Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Magnetic fields can be generated by moving charges, such as an electrical current. The magnetic field generated by a current can be calculated from the Maxwell equation. In addition, magnetic objects such as bar magnets can also generate magnetic fields due to microscopic dynamics of charges inside the material. Magnetic fields will exert magnetic force on other moving...
FAQs
A sharp probe creates a nanoscale site where the incident light interacts strongly with the sample. The resulting local optical field is enhanced and scattered by the probe-sample interaction, so the measured signal can vary over distances smaller than the conventional diffraction limit. This localized response enables optical mapping alongside nanoscale positioning.
A metal-coated or metallic tip participates directly in the local light-matter interaction at the sample surface. Its presence enhances the local optical field and produces scattered light that carries information about the nearby material. Monitoring this scattering makes it possible to connect nanoscale probe locations with local optical and chemical differences.
The atomic force microscope controls the probe position while the optical system monitors scattering from the illuminated tip and sample region. Because both signals are collected during scanning, researchers can compare surface morphology with local optical response. This paired measurement helps distinguish structural variations from changes in the material’s optical or chemical behavior.
The process begins by illuminating a metal-coated or metallic tip positioned near the sample. The atomic force microscope then controls the probe as it scans relevant locations, while the system monitors light scattered through the tip-sample interaction. The resulting measurements are organized into topographic and optical maps for spatial comparison.
In biological research, the method can examine membranes, proteins, and other cellular components where chemical or structural variation occurs at nanometer-scale locations. Its value comes from examining these features together with their surface morphology. This supports analysis of molecular organization and heterogeneous regions that may not be uniform across a biological sample.
Spectroscopic information adds a chemical dimension to the structural and topographic measurements. In biological systems, that combination can help investigate molecular organization, interactions, and spatial heterogeneity within membranes, proteins, and cellular components. Researchers can therefore relate a local optical response to the physical location and morphology of the feature being studied.