OPTICAL ELEMENT AND METHOD OF MANUFACTURING OPTICAL ELEMENT WITH EACH OF FIRST AND SECOND LAYERS HAVING A REPETITION STRUCTURE
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Abstract
An optical element having a three-dimensional structure which can function in a visible range and can improve adherence at a structural interface of the element, and a method of manufacturing the optical element. The optical element includes a substrate, and at least a first layer and a second layer on the substrate are manufactured such that each of the first layer and the second layer has a repetition structure of spaces and structural parts at a pitch equal to or less than a wavelength of visible light, and at an interface between the first layer and the second layer, overlapped structures are provided in which the repetition structure of the first layer and the repetition structure of the second layer overlap in a stack direction of the layers.
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Citations
9 Claims
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1-7. -7. (canceled)
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8. A method of manufacturing an optical element comprising a substrate, and a first layer and a second layer formed on the substrate, the method comprising the steps of:
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forming the first layer on the substrate; processing in the first layer a repetition structure comprised of spaces and structural parts, having a pitch equal to or less than a wavelength of visible light; filling the spaces in the repetition structure with a material of a sacrificial layer; etching the sacrificial layer to expose an upper portion of the repetition structure from the sacrificial layer; forming the second layer on the repetition structure and the sacrificial layer; processing in the second layer a repetition structure comprised of spaces and structural parts, having a pitch equal to or less than a wavelength of visible light; and removing the sacrificial layer, and wherein in the step of exposing the upper portion of the repetition structure from the sacrificial layer, side surfaces of the repetition structure are exposed in a range of 3 nm or more and 20 nm or less from an upper surface of the repetition structure.
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9. (canceled)
Specification