Patent ID: 11862933
Assignee: TRUMPF PHOTONIC COMPONENTS GMBH
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 0:
1. A method of forming an electrical metal contact within a semiconductor layer stack of a vertical cavity surface emitting laser, the method comprising:
forming a contact hole into the semiconductor layer stack, the contact hole having a bottom and a side wall extending from the bottom, wherein the contact hole is formed with a depth of more than 10 μm,
providing a photoresist mask inside the contact hole, the photoresist mask covering the side wall of the contact hole, the photoresist mask having an opening extending to the bottom of the contact hole,
wet-chemical isotropic etching the bottom of the contact hole,
depositing a metal on the bottom of the contact hole, and
removing the photoresist mask so that the metal on the bottom of the contact hole is left as the electrical metal contact.