OFA08 Optische Pinzetten und Lichtmikroskopie – Manipulation kleiner Objekte mit Photonen
A classic method of investigation of surfaces is light microscopy. So that we achieve resolutions into the Sub-micron range, as in this recording one Polypropylene or in this recording of a Polyurethane foam. Mderne light microscopes have opportunity not only to make small objects visible, they can Objects with so-called “optical tweezers” to move. It makes use of it, Refraction at the same time that the pulse transfer to a is coupled. When an intense beam of light is refracted at a small object, following the beam path to Snell Refraction law. The light beam is deflected to the left, in this example – receives the photon an impulse to the left. Therefore, the object must have an impulse to right itself. If you build this momentum transfer skill can with intense light (Laser light) small Moving objects. It is important that the light not of the forceps Object is absorbed. Here we see the basic structure of a modern light microscope. We once the light source is used to make visible the object we have. The image of the object is an eyepiece or recorded by a camera (image processing). And we have a plurality of laser, which can be used to the object to move using the principle of optical tweezers. Light microscopy can be applied in veschiedenen media (air, water, etc.) We can thus no structures smaller than 200 nanometers dissolve.