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HL: Halbleiterphysik

HL 42: Symposium: Photonic Crystals

HL 42.1: Vortrag

Montag, 7. März 2005, 15:00–15:30, TU P270

The Mid-field microscope: Development of a 50 nm resolution microscope based on surface plasmon effects — •Ian T. Young, Yuval Garini, and Margreet Docter — Department of Imaging Science & Technology, Faculty of Applied Sciences, Lorentzweg 1, Delft University of Technology, NL-2628 CJ Delft, The Netherlands

Ebbesen, Lezec and others have described a technique to achieve an extraordinary transmission of light through small holes (< 200 nm) in a thin metallic film. This phenomenon is thought to be due to photon-plasmon interactions in thin metallic films that contain a periodic structure (e.g. a set of holes). Three main features of this phenomenon are: 1) Larger transmitted intensity than predicted by quantum calculations; 2) Well-defined transmission spectrum, and; 3) Possibly a very small diffraction (about 3 degrees) of transmitted light, in contrast to conventional diffraction. We are constructing a nano-array illuminator consisting of a thin metallic film containing an array of nano-sized holes and a mechanical translation mechanism. This configuration will be used with conventional optics and a scientific CCD camera to achieve a new type of NSOM system that we refer to as a mid-field microscope. With this microscope we expect lateral resolution on the order of the hole diameter, 50 nm, a sample depth up to 1-2 microns, and partial confocality permitting high-resolution, high-speed, three-dimensional image acquisition.