Patent ID: 8399179
Filing Date: 2013-03-19
Classification: G03F

Abstract:
1. A method for forming a high aspect ratio microstructure, the method comprising: a) forming on a conductive surface of a carrier substrate one or more dielectric structures to create a mandrel; b) forming masking material by electrodepositing on exposed areas of the conductive surface of the mandrel one or more metal structures; c) forming a composite structure by taking a photopolymer structure comprising a substrate having thereon an electromagnetic radiation-sensitive photopolymer of either a positive tone or a negative tone, the photopolymer having a thickness substantially equal to the desired height of the microstructure to be formed, and adhering the photopolymer to the masking material, wherein the masking material is opaque to the electromagnetic radiation; d) removing the carrier substrate to leave a masked structure; e) exposing the photopolymer to electromagnetic radiation to which it is sensitive so as to irradiate regions of the photopolymer not corresponding to the one or more metal structures and substantially not to irradiate regions of the photopolymer corresponding to the one or more metal structures; and f) developing to selectively remove those portions of the photopolymer exposed to the radiation if the photopolymer has a positive tone; or to selectively remove the unexposed portions of the photopolymer if the photopolymer has a negative tone, thereby forming a high aspect ratio microstructure.