Patent ID: 11909175
Assignee: APPLE INC.
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 18:
19. An electronic device, comprising:
a housing;
a cover mounted to the housing;
a display positioned under the cover and viewable through the cover;
a horizontal cavity surface-emitting laser (HCSEL) configured to emit infrared radiation through at least a primary emission facet at one end of the HCSEL and through the display and the cover;
a semiconductor substrate on which the HCSEL is epitaxially grown;
a photodetector, epitaxially grown on the semiconductor substrate and separated from the HCSEL by a trench;
at least one first coating on at least one vertical wall of the trench and not extending over the primary emission facet; and
at least one second coating on at least one vertical wall of the trench and extending over the primary emission facet; wherein,
the at least one first coating has a first reflectivity different from a second reflectivity of the at least one second coating.