Patent ID: 9183854
Filing Date: 2015-11-10
Classification: G02B,G11B

Abstract:
1. A method for manufacturing an interferometric taper waveguide (I-TWG), the method comprising: depositing a film stack, the film stack comprising a plurality of hard mask layers and a cladding-core sandwich layer, wherein the plurality of hard mask layers is located above the cladding-core sandwich layer, and the cladding-core sandwich layer comprises a top cladding layer, a bottom cladding layer, and a core layer located between the top cladding layer and the bottom cladding layer; spinning a photoresist layer on a top hard mask layer; defining with a first microfabrication process an I-TWG pattern in the photoresist layer; transferring with a second microfabrication process the I-TWG pattern to the top hard mask layer; removing the photoresist; forming with a third microfabrication process the I-TWG pattern in a bottom hard mask layer; transferring with a fourth microfabrication process the I-TWG pattern to the core layer; refilling cladding material; removing with a fifth microfabrication process excess cladding material; planarizing with a sixth microfabrication process a top surface of the I-TWG; and removing with a seventh microfabrication process the bottom hard mask layer.