Researchers have invented a new way to align 3D semiconductor chips by shining a laser through concentric metalenses patterned on the chips to produce a hologram. Their work can help to lower the cost ...

Photonic integrated circuits (PICs) are compact devices that combine multiple optical components on a single chip. They have a wide range of applications in communications, ranging, sensing, computing ...

[Left] Semiconductor layers are stacked using concentric metalenses as alignment marks. [Right] Light shines through these marks to project a hologram. The alignment or misalignment of the lenses ...