title: Focusing waveguide grating coupler using a diffractive doublet.
abstract: A novel focusing waveguide grating coupler comprising an integrated uniform grating coupler and binary-phase-only diffractive lens is proposed, designed, and fabricated. Experimental results are also presented to demonstrate the device performance. This device is in direct competition with single-element focusing grating couplers defined by direct-write electron-beam lithography and its structure is attractive because the fabrication procedure is better suited for mass production.
authors.forename: S
authors.initials: S
authors.lastname: Sheard
authors.forename: T
authors.initials: T
authors.lastname: Liao
authors.forename: G
authors.initials: G
authors.lastname: Yang
authors.forename: P
authors.initials: P
authors.lastname: Prewett
authors.forename: J
authors.initials: J
authors.lastname: Zhu