Patent ID: 9096948
Filing Date: 2015-08-04
Classification: C30B,G02B

Abstract:
1. A method for the fabrication of waveguiding, orientation-patterned semiconductor structures on a growth template, the growth template comprising a first set of template domains comprising a material having a first crystalline orientation and second set of template domains comprising the material having a second crystalline orientation, wherein the domains of the first set and the domains of the second set are disposed in a periodically alternating arrangement along the optical propagation axis of the structure, the method comprising: optionally, growing a layer of buffer material on a growth template; wherein the layer of buffer material comprises a first set of buffer layer domains grown on the first set of template domains and having a first crystalline orientation and a second set of buffer layer domains grown on the second set of template domains and having a second crystalline orientation; and, if a layer of buffer material is grown, planarizing the top surface of the layer of buffer material using a chemical polish followed by an isotropic etch; growing a lower layer of cladding material on the growth template or, if present, on the layer of buffer material; wherein the lower layer of cladding material comprises a first set of lower cladding layer domains grown on the first set of template domains or, if present, on the first set of buffer layer domains, and having a first crystalline orientation and a second set of lower cladding layer domains grown on the second set of template domains or, if present, on the second set of buffer layer domains, and having a second crystalline orientation; planarizing the top surface of the lower layer of cladding material using a chemical polish followed by an isotropic etch; growing a layer of core material on the lower layer of cladding material; wherein the layer of core material comprises a first set of core layer domains grown on the first set of lower cladding layer domains and having a first crystalline orientation and a second set of core layer domains grown on the second set of lower cladding layer domains and having a second crystalline orientation; planarizing the top surface of the layer of core material using a chemical polish followed by an isotropic etch; growing an upper layer of cladding material on the layer of core material; wherein the upper layer of cladding material comprises a first set of upper cladding layer domains grown on the first set of core layer domains and having a first crystalline orientation and a second set of upper cladding layer domains grown on the second set of core layer domains and having a second crystalline orientation; and growing a layer of ridge material on the upper layer of cladding material, wherein the layer of ridge material comprises a first set of ridge layer domains grown on the first set of upper cladding layer domains and having a first crystalline orientation and a second set of ridge layer domains grown on the second set of upper cladding layer domains and having a second crystalline orientation; planarizing the top surface of the layer of ridge material using a chemical polish followed by an isotropic etch; and fabricating a waveguide ridge from the planarized layer of ridge material.