Etched planarized VCSEL

Patent metadata

Field	Value
Publication number	US-10230215-B2
Application number	US-201715671433-A
Country	US
Kind code	B2
Filing date	Aug 8, 2017
Priority date	Aug 8, 2016
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

An etched planarized VCSEL includes: an active region; a blocking region over the active region, and defining apertures therein; and conductive channel cores in the apertures, wherein the conductive channel cores and blocking region form an isolation region. A method of making the VCSEL includes: forming the active region; forming the blocking region over the active region; etching the apertures in the blocking region; and forming the conductive channel cores in the apertures of the blocking region. Another etched planarized VCSEL includes: an active region; a conductive region over the active region, and defining apertures therein; and blocking cores in the apertures, wherein the blocking cores and conductive region form an isolation region. A method of making the VCSEL includes: forming the active region; forming the conductive region over the active region; etching the apertures in the conductive region; and forming the blocking cores in the apertures of the conductive region.

First claim

The invention claimed is:

1. An etched planarized vertical cavity surface emitting laser (VCSEL) array comprising:
an active region;
a blocking region over the active region, the blocking region defining a plurality of apertures therein, wherein the plurality of apertures are laterally arranged in the blocking region;
a plurality of conductive channel cores in the plurality of apertures of the blocking region, wherein the plurality of conductive channel cores and blocking region form an isolation region;
a bottom mirror region below the active region and the plurality of conductive channel cores;
a top mirror region above the isolation region and the plurality of conductive channel cores; and
a top light emitting surface for the plurality of conductive channel cores;
wherein the plurality of conducive channel cores, mirror layers of the top mirror region, and light emitting surface are planarized, and
wherein the VCSEL array is devoid of a mesa.

2. The VCSEL of claim 1 , wherein the blocking region has a thickness from 1 nm to 500 nm.

3. The VCSEL of claim 1 , wherein each conductive channel core has a diameter of about 1 micron to about 10 microns.

4. The VCSEL of claim 1 , wherein each conductive channel core has higher refractive index than the blocking region.

5. The VCSEL of claim 1 , wherein the VCSEL is devoid of: an oxide aperture; and oxidation.

6. The VCSEL of claim 1 , further comprising a conductive wing layer integrated or in contact with tops of the plurality conductive channel cores.

7. A method of making the VCSEL of claim 1 , comprising:
forming the active region over a substrate;
forming the blocking region over the active region;
etching the plurality of apertures in the blocking region; and
forming the plurality of conductive channel cores in the plurality of apertures of the blocking region.

8. The method of claim 7 , further comprising:
coating a top of the blocking region with a chemical agent that inhibits etching while leaving a plurality of without the chemical agent; and
etching the plurality of the apertures in the blocking region in the plurality of regions without the chemical agent.

9. The method of claim 8 , further comprising filling the one or more of the apertures in the blocking region with the plurality of conductive channel cores by MOCVD.

10. The method of claim 8 , further comprising:
removing the chemical agent that inhibits the etching after the etching to form the plurality of apertures and before the filling of the plurality of apertures with the plurality of conductive channel cores.

11. The method of claim 7 , further comprising forming the conductive channel core to extend through the blocking region and contact the active region or contact a top spacer region that is above the active region.

12. The method of claim 7 , further comprising forming a plurality of the conductive channel cores in the common blocking region.

13. The method of claim 7 , further comprising forming a conductive wing layer so as to be integrated or in contact with tops of the plurality of conductive channel cores.

14. The method of claim 7 , further comprising planarizing a top surface of the plurality of conducive channel cores.

15. The VCSEL of claim 1 , wherein the conductive channel cores are separated from each other by about 1 micron to 10 microns.

16. The VCSEL of claim 15 , wherein the blocking region is InGaP and the conductive channel cores are AlGaAs.

17. The VCSEL of claim 6 , wherein the conductive wing layer extends between and connects the plurality of conductive channel cores.

18. The VCSEL of claim 15 , wherein each conductive channel core has a center point, and a distance between each center point is about 2 microns to about 6 microns.

19. An etched planarized vertical cavity surface emitting laser (VCSEL) array comprising:
an active region;
a conductive region over the active region, the conductive region defining a plurality of apertures therein;
a plurality of blocking cores in the one or more apertures of the conductive region, wherein the plurality of blocking cores and conductive region form an isolation region;
a bottom mirror region below the active region, the conductive region, and the plurality of blocking cores;
a top mirror region above the isolation region, conductive region, and the plurality of blocking cores, and
a top light emitting surface for the conductive region;
wherein the conductive region, plurality of blocking cores, mirror layers of the top mirror region, and light emitting surface are planarized, and
wherein the VCSEL array is devoid of a mesa.

20. A method of making the VCSEL of claim 19 , comprising:
forming the active region over a substrate;
forming the conductive region over the active region;
etching the plurality of apertures in the conductive region; and
forming the plurality of blocking cores in the plurality of apertures of the conductive region.

Assignees

• Finisar Corp

Inventors

• Graham Luke
• MacInnes Andy

Classifications

• H01S5/423 Primary

  having a vertical cavity · CPC title

• H01S5/0425

  Electrodes, e.g. characterised by the structure · CPC title

• H01S5/18338

  Non-circular shape of the structure · CPC title

• H01S2301/203

  with at least one hole in the intensity distribution, e.g. annular or doughnut mode · CPC title

• H01S5/18358

  containing spacer layers to adjust the phase of the light wave in the cavity · CPC title