A New Type of Lens with Binary Subwavelength Structures

Martin Schmitz and Olof Bryngdahl, Univ. of Essen, Essen, Germany.

Cylindrical microlenses are frequently applied in optical technology, for example, collimating light emitted by laser diodes and coupling light in integrated optics. These applications require diffraction-limited microlenses with high numerical apertures (NA). Microlenses can be refractive or diffractive. Diffractive microlenses offer greater flexibility in their design. With an increase of the NA, the lateral extension of the structure details of diffractive microlenses decreases and it is necessary to use rigorous electromagnetic diffraction theory for their design with high NAs. We have used the volume integral method for this purpose.

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