FIELD: physics, optics.
SUBSTANCE: microlens can be used in planar imaging devices, integrated optical devices, for connecting optical waveguides, for inputting radiation into photonic crystal and planar waveguides etc. The planar cylindrical microlens has a rectangular entrance aperture and is in the form of a photonic crystal. A slit is made along the optical axis of the microlens. The length of the slit is less than or equal to the length of the microlens and reaches the focal plane of the microlens. The microlens can be easily made by nanolithography or photolithography.
EFFECT: enabling focusing of TM polarised light into a spot with a width less than the diffraction limit of the order of 0,03 times the light wavelength.
8 dwg
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