An eyepiece (100, 200) for projecting an image to an eye of a viewer, the eyepiece (100, 200) comprising: a waveguide having a surface and configured to propagate light therein; and a diffractive optical element optically coupled to the waveguide, the diffractive optical element including: a plurality of first ridges protruding from the surface of the waveguide and arranged as a periodic array having a period, each respective first ridge of the plurality of first ridges having a first height (h 1) in a direction perpendicular to the surface of the waveguide and a respective first width (w 1) in a direction of the period; and a plurality of second ridges, each respective second ridge of the plurality of second ridges protruding from a respective first ridge and having a second height (h 2) greater than the first height (h 1) and a respective second width (w 2) less than the respective first width (w 1); wherein the diffractive optical element is configured to diffract a first portion of the light propagating in the waveguide toward the eye as a first order reflection, and to diffract a second portion of the light propagating in the waveguide away from the eye as a first order transmission, characterized in that the respective first width (w 1) and the respective second width (w 2) are selected such that the diffractive optical element has a first order reflection efficiency greater than a first order transmission efficiency. a waveguide having a surface and configured to propagate light therein; and a diffractive optical element optically coupled to the waveguide, the diffractive optical element including: a plurality of first ridges protruding from the surface of the waveguide and arranged as a periodic array having a period, each respective first ridge of the plurality of first ridges having a first height (h 1) in a direction perpendicular to the surface of the waveguide and a respective first width (w 1) in a direction of the period; and a plurality of second ridges, each respective second ridge of the plurality of second ridges protruding from a respective first ridge and having a second height (h 2) greater than the first height (h 1) and a respective second width (w 2) less than the respective first width (w 1); wherein the diffractive optical element is configured to diffract a first portion of the light propagating in the waveguide toward the eye as a first order reflection, and to diffract a second portion of the light propagating in the waveguide away from the eye as a first order transmission, characterized in that the respective first width (w 1) and the respective second width (w 2) are selected such that the diffractive optical element has a first order reflection efficiency greater than a first order transmission efficiency. a plurality of first ridges protruding from the surface of the waveguide and arranged as a periodic array having a period, each respective first ridge of the plurality of first ridges having a first height (h 1) in a direction perpendicular to the surface of the waveguide and a respective first width (w 1) in a direction of the period; and a plurality of second ridges, each respective second ridge of the plurality of second ridges protruding from a respective first ridge and having a second height (h 2) greater than the first height (h 1) and a respective second width (w 2) less than the respective first width (w 1); wherein the diffractive optical element is configured to diffract a first portion of the light propagating in the waveguide toward the eye as a first order reflection, and to diffract a second portion of the light propagating in the waveguide away from the eye as a first order transmission, characterized in that the respective first width (w 1) and the respective second width (w 2) are selected such that the diffractive optical element has a first order reflection efficiency greater than a first order transmission efficiency.