The field of 3D micro‐optics is rapidly expanding, and essential advances in femtosecond
laser direct‐write 3D multi‐photon lithography (MPL, also known as two‐photon or multi …

Lasers are the pillars of modern optics and sensing. Microlasers based on whispering-
gallery modes (WGMs) are miniature in size and have excellent lasing characteristics …

This perspective is an overview of a recent direction in optical 3D printing, where
polymerization of crosslinkable materials and nanomaterial fillers can be guided to the final …

The burgeoning field of nanophotonics has grown to be a major research area, primarily
because of the ability to control and manipulate single quantum systems (emitters) and …

On-chip integration of quantum optical systems could be a major factor enabling photonic
quantum technologies. Unlike the case of electronics, where the essential device is the …

Integrated quantum photonics, ie the generation, manipulation, and detection of quantum
states of light in integrated photonic chips, is revolutionizing the field of quantum information …

The direct laser writing technique based on two-photon polymerization (TPP) has evolved
considerably over the past two decades. Its remarkable characteristics, such as 3D …

Integrated optical chips have already been established for application in optical
communication. They also offer interesting future perspectives for integrated quantum optics …

We demonstrate a quantum key distribution (QKD) testbed for room temperature single
photon sources based on defect centres in diamond. A BB84 protocol over a short free …

Fully integrated quantum technology based on photons is in the focus of current research,
because of its immense potential concerning performance and scalability. Ideally, the single …