Method for providing an optical interface and devices according to such methods
View Patent ↗A method for providing an optical interface with at least one optical coupling structure for a packaged optical device is described. The at least one optical coupling structure may be, for example, wave-guides and/or microlenses. The packaged optical device includes an external alignment structure. The external alignment structure has a support means with at least one hole and at least one alignment feature. The method includes providing optical encapsulate material in the hole of the support means. Optical coupling structures, such as wave-guides or microlenses, may be provided into the encapsulation at a well-defined position relative to the at least one alignment feature of the external alignment structure. By providing the optical coupling structures directly in the material comprised in the encapsulation, a high degree of alignment accuracy is obtained.
1. A method for forming an optical module having an optoelectronic component and an optical interface with an optical coupling structure, comprising in combination:
providing an external alignment structure, comprising a support means with at least one hole and at least one alignment feature;
providing an encapsulation comprising optical encapsulate material in the at least one hole; and
forming at least one optical coupling structure in the encapsulation, wherein the at least one optical coupling structure is formed at a well-defined position relative to the at least one alignment feature of the external alignment structure; and
coupling at least one optoelectronic component to the at least one optical coupling structure, wherein the at least one optoelectronic component is separated from an edge and outside of the at least one hole.
2. A method according to claim 1 , wherein forming at least one optical coupling structure in the encapsulation comprises direct writing at least one optical coupling structure into the encapsulation.
3. A method according to claim 1 , further comprising, prior to forming at least one optical coupling structure in the encapsulation, flattening an external surface of the optical encapsulate material, thereby creating a substantially flat external surface of the encapsulation.
4. A method according to claim 3 , wherein the external surface of the encapsulation is aligned with an external surface of the support means.
5. A method according to claim 3 , wherein the external surface of the encapsulation is outside a plane determined by the external surface of the support means.
6. A method according to claim 3 , wherein the at least one optical coupling structure comprises micro lenses formed on the external surface of the encapsulation.
7. A method according to claim 3 , wherein flattening the external surface of the optical encapsulate material, comprises:
providing a flattening layer on the external surface of the optical encapsulate material; and
curing of the optical encapsulate material underneath the flattening layer.
8. A method according to claim 7 , wherein the flattening comprises at least one radiation curing step.
9. A method according to claim 8 , wherein a mask is used to pattern the at least one radiation curing step.
10. A method according to claim 3 , wherein flattening the external surface of the optical encapsulate material, comprises:
providing a flattening layer on a stamp;
pressing the flattening layer on the external surface of the optical encapsulate material by means of the stamp;
curing the optical encapsulate material underneath the flattening layer; and
removing the stamp.
11. A method according to claim 10 , wherein the step of removing the stamp also removes the flattening layer.
12. A method according to claim 10 , wherein the step of removing the stamp leaves the flattening layer attached to the cured optical encapsulate material, as part of the encapsulation.
13. A method according to claim 10 , wherein the stamp is such that it forms a mask.
14. A method according to claim 1 , wherein the at least one optical coupling structure includes wave-guides formed through the encapsulation.
15. A method according to claim 14 , wherein the wave-guides are ordered into an array configuration.
16. A method according to claim 1 , wherein the hole comprises an optical element.
17. A method according to claim 1 , wherein the support means comprises alignment features on two sides of the hole.
18. A method according to claim 1 , wherein providing an external alignment structure comprises positioning an external alignment feature on a device support means of a device comprising the at least one optoelectronic component, and wherein providing the encapsulation bridges a gap between the optical interface and the at least one optoelectronic component on the device.
19. A method according to claim 1 , wherein forming at least one optical coupling structure comprises ablating the at least one optical coupling structure in the encapsulation.