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Deep-etch X-ray lithography allows the fabrication of micro-optical components with critical lateral dimensions of a few micrometers and structural heights up to several hundred micrometers. Using interferometric methods, the structural tolerances of the side walls of fabricated microstructures are shown to be about 0.3 micrometer per 300 micrometers of structural height. A parallel HeNe laser beam is easily passed through several microprisms which is an evidence for the high precision achievable in positioning micro-optical components on a baseplate. Focussing a light beam by cylinder lenses is also possible. The free two-dimensional shape and the high precision achievable in positioning allow to fabricate micro-optical components with integrated fibre fixing grooves in which multi-mode fibres are precisely positioned. Simple fibre connectors, e.g. fibre forks or Y-couplers, can be achieved. By using a light-guiding resist system divergence losses can be diminished.