Optical and optoelectronic assemblies including micro-spacers, and methods of manufacturing the same
The present disclosure describes optical and optoelectronic assemblies that, in some cases, include screen-printed micro-spacers, as well as methods for manufacturing such assemblies and modules. For example, an optoelectronic device mounted on a substrate can include an optical sub-assembly including a first optical element and a first micro-spacer on the optical element. The optical sub-assembly can be disposed over the optoelectronic device, with a first air or vacuum gap separating the first optical element from the optoelectronic device, and the first micro-spacer laterally surrounding the first air or vacuum gap.
1. An optoelectronic module comprising:
an optoelectronic device mounted on a substrate;
a first optical sub-assembly including a first optical element and a first micro-spacer on the first optical element, wherein the first optical sub-assembly disposed over the optoelectronic device, a first air or vacuum gap separating the first optical element from the optoelectronic device, and wherein the first micro-spacer laterally surrounds the first air or vacuum gap;
wherein the first optical sub assembly includes a second optical element, the first and second optical elements being separated by a second air or vacuum gap laterally surrounded by a second micro-spacer; and
a second optical sub-assembly including third and fourth optical elements separated by a third air or vacuum gap laterally surrounded by a third micro-spacer.
2. The optoelectronic module of claim 1 wherein each micro-spacer is composed of an adhesive material.
3. The optoelectronic module of claim 1 , wherein the second optical sub-assembly is disposed over the first optical sub-assembly.
4. The optoelectronic module of claim 1 , further comprising a light guide located between the first optical assembly and the second optical assembly.
5. The optoelectronic module of claim 1 , further comprising an opaque material laterally encapsulating the edges of the first and second optical elements or the third and fourth optical elements.
6. The optoelectronic module of claim 1 , wherein at least one of the first, second, third, or fourth optical elements comprises an IR absorber layer, a dielectric optical filter layer, or an optical interference filter layer.