US Patent 11699774 Semiconductor device

The present disclosure provides a semiconductor device. The semiconductor device includes a substrate having a first side and a second side opposite to the first side; a first optical element at the first side of the substrate; and a semiconductor stack on the substrate. The semiconductor stack includes a first reflective structure; a second reflective structure; a cavity region between the first reflective structure and the second reflective structure and having a first surface and a second surface opposite to the first surface; and a confinement layer in one of the second reflective structure and the first reflective structure. The semiconductor device further includes a first electrode and a second electrode on the first surface.