Our lab designs, fabricates, tests, and integrates photonic devices and systems in silicon nitride. These devices leverage the low optical loss of silicon nitride to realize novel functionality such as ultra-high-Q waveguide resonators and narrow linewidth on-chip laser sources. We demonstrate these devices operating at the system scale in applications ranging from atomic-referenced metrology, to low power, ultra-high-capacity optical communications for tomorrow’s energy efficient hyperscale data centers.

Group Operating Principles

The Blumenthal Group is committed to cultivating a respectful, exploratory, and collaborative culture in photonics and the broader scientific community. We adhere to the principle that members of our community should treat one another with respect and decency at all times - and that we should not alienate, diminish, or insult others, personally or professionally, in word or deed. We believe that well-being, mentorship, collaboration, and a sense of belonging are moral imperatives vital to our research and teaching mission. As individuals and as a community, we work actively to recognize and reduce all forms of discrimination, including explicit, implicit, and unintended bias.

Announcements

New Group Name! Formerly known as OCPI, we have updated our group name to the OCAQπ Group

Open Positions We are looking for exceptional postdoctoral scholars, graduate students, and undergraduate students to join our team. Contact Professor Blumenthal at danb@ece.ucsb.edu with a brief description of interests and CV attached.

Recent News

April 27, 2026

"Photonic chip-based optical frequency division with PZT-integrated soliton microcombs"

April 27, 2026

Our paper, "Anneal-free ultra-low loss silicon nitride integrated photonics", is selected as outstanding paper of Light: Science & Applications (LSA) in 2025

April 27, 2026

"Multi-laser stabilization with an atomic-disciplined photonic integrated resonator"

April 27, 2026

"Octave-spanning operation of a photonic integrated coil resonator as a reference cavity"

April 9, 2026

New articles released on our integrated photonic precision laser sources collaboration with UMass Amherst

March 13, 2026

KEYT-TV, Santa Barbara television station, covers our lab's contributions in quantum innovations

March 2, 2026

Companion theory paper describing the results of our Nature Communications paper

Research