US 12,253,723 B2
Shallow-profile optical elements for photonics receivers
Alexander Krichevsky, Cupertino, CA (US); and John M. Heck, Berkeley, CA (US)
Assigned to Intel Corporation, Santa Clara, CA (US)
Filed by Intel Corporation, Santa Clara, CA (US)
Filed on Dec. 11, 2020, as Appl. No. 17/120,039.
Prior Publication US 2021/0132306 A1, May 6, 2021
Int. Cl. G02B 6/42 (2006.01); H01L 25/16 (2023.01); H01L 31/0203 (2014.01)
CPC G02B 6/4214 (2013.01) [G02B 6/4206 (2013.01); G02B 6/4242 (2013.01); H01L 25/167 (2013.01); H01L 31/0203 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a photodetector (PD) die comprising:
an optical element formed on a first side of the PD die; and
a photodetector disposed on a second side of the PD die, the first side opposite the second side, wherein the photodetector is disposed on the second side of the PD die offset from an optical axis of the optical element,
wherein the optical element comprises a sag and a clear aperture, wherein a ratio of sag to clear aperture is less than 1:10.