Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 17: Poster Session I (Nanostructures at Surfaces; Metal Substrates: Epitaxy and Growth; Methods: Scanning Probe Techniques; Phase Transitions)
O 17.26: Poster
Montag, 26. März 2007, 17:30–20:30, Poster C
Nanostructures on insects eyes----Grasshopper — •Fengzhen Zhang1, Alexander Schmatulla1, Othmar Marti1, and Harald Wolf2 — 1Institute of Experimental Physics — 2Institute of Neurobiology
Abstract: Insects use compound eyes to see the world, a totally different way from us. They are excellent at detecting motions and have good ultraviolet vision. The optical system of the insects is the apposition of the ommatidia, each of which is an optical unit, composed of layers (around 100) and crystalline cones. The image formation of grasshopper eye is similar to telescopes, both of which are angle magnification. The aim of our research on insects' eyes is to get information about how the compound eyes look like both on the surface and inside. We will explain how the compound eyes function. AFM, a powerful tool for nanoscale measurement, is mainly used to get shapes and lengths of structures of the compound eyes. In general, single eyes are analyzed perfect hexagons in the center of the facets while they are squeezed on the edges. A statistics of the area of the hexagons shows differences among different parts of the eye. The images of the cross section of the grasshopper eyes are measured with AFM.