A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Chirped refractive microlens arrays
The presented thesis deals with the design, the fabrication, and the characterization of nonregular microlens arrays that are referred to as "chirped microlens array" (cMLA) in accordance to other non-periodical structures. In contrast to conventional, regular microlens arrays that consist of a repetitive arrangement of a unit cell on a fixed, equidistantly sectioned grid, a cMLA contains similar but not identical lenses that are defined by a parametric description. The parameters of each cell can be defined by analytical functions, by using numerical optimization techniques, or by a combination of the both. Dependency on the position of the cell within the array is the most characteristic property of these functions. Overcoming the inflexibility of a regular arrangement leads to the enhancement of the classical array concept and enables new degrees of freedom in the design of micro-optical systems. The focus of this thesis is to point out the potentials of these new design possibilities which are explained by example systems built as prototypes. Fields of application are amongst others the improvement of the system's integration and the optimization of the optical performance of a system. Applications in the field of beam shaping and miniaturized imaging optics are discussed in detail as example systems. The latter enables extremely thin imaging objectives with a track length shorter than 250µm that have their natural antetype in the compound eyes of insects. The use of a cMLA allows the correction of off-axis aberrations and consequently the extension of the field of view of the objective, whereas the array describing function can be derived analytically. For the rst time, the use of a cMLA with individually adapted lenses allows the fabrication of objectives based on the well-known imaging principle that are compliant to the demands of industrial applications rather than just being proof-of-principle demonstrators. Furthermore, a fly's eye condenser setup based on cMLAs is discussed. In contrast to the ...
Chirped refractive microlens arrays
The presented thesis deals with the design, the fabrication, and the characterization of nonregular microlens arrays that are referred to as "chirped microlens array" (cMLA) in accordance to other non-periodical structures. In contrast to conventional, regular microlens arrays that consist of a repetitive arrangement of a unit cell on a fixed, equidistantly sectioned grid, a cMLA contains similar but not identical lenses that are defined by a parametric description. The parameters of each cell can be defined by analytical functions, by using numerical optimization techniques, or by a combination of the both. Dependency on the position of the cell within the array is the most characteristic property of these functions. Overcoming the inflexibility of a regular arrangement leads to the enhancement of the classical array concept and enables new degrees of freedom in the design of micro-optical systems. The focus of this thesis is to point out the potentials of these new design possibilities which are explained by example systems built as prototypes. Fields of application are amongst others the improvement of the system's integration and the optimization of the optical performance of a system. Applications in the field of beam shaping and miniaturized imaging optics are discussed in detail as example systems. The latter enables extremely thin imaging objectives with a track length shorter than 250µm that have their natural antetype in the compound eyes of insects. The use of a cMLA allows the correction of off-axis aberrations and consequently the extension of the field of view of the objective, whereas the array describing function can be derived analytically. For the rst time, the use of a cMLA with individually adapted lenses allows the fabrication of objectives based on the well-known imaging principle that are compliant to the demands of industrial applications rather than just being proof-of-principle demonstrators. Furthermore, a fly's eye condenser setup based on cMLAs is discussed. In contrast to the ...
Chirped refractive microlens arrays
Wippermann, Frank (author) / Sinzinger, Stefan / Tünnermann, Andreas / Lindlein, Norbert
2008-06-17
Theses
Electronic Resource
English
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