After applying to several positions online and getting turned down, I finally got a phone interview from a group leader. During the phone interview I was asked to describe my research as if doing so to someone outside of my field. I was given 10 minutes to do so. Thereafter, the interviewer asked questions about some of my publications that he seemed to have already read before hand. He then proceeded to ask some tough random questions related to my optics background.
Right at the end of the phone interview, I was offered an onsite interview which I scheduled for the week after. The onsite was in Hillsboro, Oregon and comprised of a 45 minute presentation followed by questions. That was then followed by 9-10 one on one 30 minute discussions with various group members and other group leaders. I was also interviewed by the area manager who was the boss of the group leaders. All the interviews happened in the cafeteria, which made things less tense.
Ps - It is worth mentioning that the phone interview was my second with Intel. The first one had happened a week earlier with a different group leader, but somehow I got turned down for an onsite later that week. Intel recruiters tend to follow up on people like who get turned down, which is how I think I obtained the second interview (with a different group leader) a week or so later.