Focusing waveguide grating coupler using a diffractive doublet.
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.
Sheard
S
S
Liao
T
T
Yang
G
G
Prewett
P
P
Zhu
J
J