Optical alignment targets

An optical alignment target, comprising:

• a translucent or transparent substrate having a bottom surface;
• an opaque material formed over the bottom surface in a pattern, the pattern having an opaque portion of an opaque material and having a gap portion devoid of the opaque material;
• an enclosed channel disposed below the bottom surface;
• and
• a cured fluorescent material filling at least the gap portions of the pattern.

An optical alignment target, comprising:

• a substrate;
• a patterned and translucent or transparent material over the substrate, the patterned translucent or transparent material including depressions separated by interstitial regions;
• and
• an optical target in each of the depressions, the optical target including:
• i) a cured translucent or transparent matrix having a first light emitting material suspended therein;
• or
• ii) a sticky layer having a second light emitting material attached thereto or at least partially embedded therein.

An optical alignment target, comprising:

• a first structure, including:
• a substrate;
• a patterned and translucent or transparent material over the substrate, the patterned translucent or transparent material including depressions separated by interstitial regions;
• and
• an optical target in each of the depressions, the optical target including:
• i) a cured translucent or transparent matrix having a first light emitting material suspended therein;
• or
• ii) a sticky layer having a second light emitting material attached thereto or at least partially embedded therein;
• a second structure attached to the first structure, the second structure including:
• a second substrate;
• a second patterned and translucent or transparent material positioned on the second substrate, the second patterned and translucent or transparent material including second depressions separated by second interstitial regions;
• and
• a second optical target in each of the second depressions, wherein the second optical target is the same as the optical target;
• and
• a sealable channel defined between the optical target the second optical target.