Technologie pour Microscopie Accélération
Microscopique technologie a avancé rapidement pendant le développement des instruments contemporains, garde rythme avec le progrès de l’humain connaissance et technologie. scientifique recherche et matériel développement ont aussi été poussé à un inouï petit monde avec le développement de nouvelle microscopique technologie. Nombreuses études domaines, tel as polymères matériaux, optoélectronique matériaux, nanomatériaux, matériaux biologiques, etc., can benefit from the use of atomic force microscopy. Additionally, its probes can be used to manipulate surface atomes or molecules, opening up new possibilities for scientific inquiry.
A scanning tunneling microscope, which can capture images of individual atoms on the surface and is at least three times faster than current microscopes, was reportedly developed by Cornell University physicist Keith Swaber using a measurement technique in nanoelectronics. hundred times faster. Quantum tunneling or electron tunneling can be used by a scanning tunneling microscope to determine the separation between a needle-type detector and a conductive surface.
The researchers discovered that they could leverage the ability of the wave to reflect toward the wave source by adding an extra radio-frequency wave source and delivering a wave through a straightforward network into the scanning tunneling microscope to measure the resistance of the tunnel junction. Reflectometer technology employs a regular cable as a route for high-frequency waves, and the speed is unaffected by the cable's capacity limit. The detector is then raised a few angstroms above the sample surface by a small voltage that is applied across the sample.
It should be emphasized that a perfect scanning tunneling microscope would be able to gather data at a rate of one gigahertz, or one billion cycles per second, as fast as electrons can be kept moving down the tunnel. However, a typical scanning tunneling microscope's speed, which is on the order of 1 kilohertz or even slower, is constrained by the readout circuit's cable capacity or energy storage.
Il devrait être souligné que un parfait balayage tunneling microscope aurait une bande passante de un milliard cycles par seconde et a taux de un gigahertz, ou la vitesse à la électrons peut être conservée en mouvement à travers le tunnel. Cependant, le lecture circuit's câble capacité ou énergie stockage limites la vitesse de a standard balayage tunneling microscope, qui fait it excessivement lent—on le ordre de 1 kilohertz ou même inférieur.
