Phys.org September 26, 2023
UV and visible photonics enable applications ranging from spectroscopic sensing to communication and quantum information processing. Photonics structures in these wavelength regimes tend to experience higher loss than their IR counterpart. Particularly in the near-UV band, on-chip optical microresonators have not yet achieved a quality factor beyond 1 million. A team of researchers in the US (Yale University, industry) developed ultra-low-loss photonic waveguides and resonators patterned from alumina thin films prepared by a highly scalable atomic layer deposition process. They demonstrated ultra-high Q factor of 1.5×106 at 390 nm, a record value at UV bands, and 1.9×106 at 488.5 nm… read more. Open Access TECHNICAL ARTICLE
Comparison of int vs. wavelength (300 - 500 nm) for recent reports on nanophotonic devices using different materials… Credit: Optics Express, Vol. 31, Issue 21, pp. 33923-33929 (2023)