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, micro-spacers can be applied on a first optical element layer, and a second optical element layer can be provided on the first micro-spacers. By providing the second optical element layer on the first micro-spacers, the second optical element layer and the first optical element layer can be separated from one another by air or vacuum gaps each of which is laterally surrounded by a portion of the first micro-spacers.
1. An apparatus comprising:
an opto-electronic device operable to emit or detect radiation of a particular wavelength, wherein the opto-electronic device is covered by an encapsulant that is transparent to radiation of the particular wavelength;
a subassembly comprising:
a first optical element;
a second optical element separated from the first optical element by an air or vacuum gap, wherein at least one of the first or second optical elements comprises an IR absorber layer;
a first micro-spacer separating the first optical element from the second optical element, and laterally surrounding the air or vacuum gap; and
a second micro-spacer on the second optical element, the second micro-spacer being on a side of the second optical element opposite that of the first micro-spacer;
wherein the subassembly is disposed on the encapsulant such that the second micro-spacer rests on a surface of the encapsulant, and such that a second air or vacuum gap is present between the second optical element and the encapsulant, the second air or vacuum gap being surrounded laterally by the second micro-spacer.
2. The apparatus of claim 1 wherein each of the first and second micro-spacers is a screen-printed, auger valve dispensed or jetted micro-spacer.
3. The apparatus of claim 1 wherein the first micro-spacer includes a die-cut pressure sensitive layer.
4. The apparatus of claim 1 wherein the first micro-spacer is composed of a cured material.
5. The apparatus of claim 1 wherein the first micro-spacer is composed of an adhesive.
6. The apparatus of claim 1 wherein the first micro-spacer has a thickness in a range of 20-50 microns.
7. An apparatus comprising:
an opto-electronic device operable to emit or detect radiation of a particular wavelength, wherein the opto-electronic device is covered by an encapsulant that is transparent to radiation of the particular wavelength;
a subassembly comprising:
a first optical element;
a second optical element separated from the first optical element by an air or vacuum gap, wherein at least one of the first or second optical elements comprises an optical interference filter layer;
a first micro-spacer separating the first optical element from the second optical element, and laterally surrounding the air or vacuum gap; and
a second micro-spacer on the second optical element, the second micro-spacer being on a side of the second optical element opposite that of the first micro-spacer;
wherein the subassembly is disposed on the encapsulant such that the second micro-spacer rests on a surface of the encapsulant, and such that a second air or vacuum gap is present between the second optical element and the encapsulant, the second air or vacuum gap being surrounded laterally by the second micro-spacer.
8. The apparatus of claim 7 wherein each of the first and second micro-spacers is a screen-printed, auger valve dispensed or jetted micro-spacer.
9. The apparatus of claim 7 wherein the first micro-spacer includes a die-cut pressure sensitive layer.
10. The apparatus of claim 7 wherein the first micro-spacer is composed of a cured material.
11. The apparatus of claim 7 wherein the first micro-spacer is composed of an adhesive.
12. The apparatus of claim 7 wherein the first micro-spacer has a thickness in a range of 20-50 microns.