Locally antireflection-coated split pupil input couplers for multisheet diffractive waveguides

A device, comprising:

• a first waveguide, the first waveguide having:
• a first input coupler operable to receive a first color light and in-couple the first color light into the first waveguide;
• and
• a first coating area adjacent to a first grating of the first input coupler, the first coating area operable to receive a second color light and a third color light, the first coating area having a first anti-reflective coating with a first transmission refractive index such that in operation the second color light is transmitted through the first waveguide to a second waveguide, and the first coating area having a second anti-reflective coating with a second transmission refractive index such that in operation the third color light is transmitted through the first waveguide to the second waveguide;
• the second waveguide, the second waveguide having:
• a second input coupler operable to receive the second color light and in-couple the second color light into the second waveguide;
• and
• a second coating area adjacent to a second grating of the second input coupler, the second coating area operable to receive the third color light, the second coating area having a third anti-reflective coating with a third transmission refractive index such that in operation the third color light is transmitted through the second waveguide to a third waveguide;
• and
• the third waveguide below the second waveguide, the third waveguide having a third input coupler disposed below and aligned with the second coating area, the third input coupler operable to receive the third color light and in-couple the third color light into the third waveguide.