• Scientists create ultra-low loss optical device that traps light on a chip Researchers at CU Boulder have developed highly efficient optical microresonators that could support a new generation of powerful sensor technologies. • A microresonator is a microscopic structure designed to confine light in a small space. • As light circulates inside, its intensity increases. • When that intensity reaches a sufficient level, scientists can carry out specialized optical processes that enable sensing and other advanced functions. • “Our work is about using less optical power with these resonators for future uses,” said Bright Lu, a fourth year doctoral student in electrical and computer engineering and a lead author on the study. • “One day these microresonators can be adapted for a wide range of sensors from navigation to identifying chemicals.” The research was published inApplied Physics Letters.

Article Summaries:

  • Scientists at the University of Colorado Boulder have engineered microscopic racetrack resonators that trap and amplify light with record‑low loss. By shaping the device with smooth Euler curves-curves used in road design to avoid sharp turns-the team minimized bending loss, allowing photons to circulate longer. Fabricated in the COSINC clean room with a new electron‑beam lithography system, the chalcogenide‑glass resonators achieve sub‑nanometer precision, placing them among the highest‑performance optical devices. The breakthrough could enable compact, low‑power sensors, microlasers, and advanced quantum technologies. The work was published in Applied Physics Letters on February 24, 2026.
  • Scientists create ultra-low loss optical device that traps light on a chip - Date: - February 24, 2026 - Source: - University of Colorado at Boulder - Summary: - CU Boulder researchers have designed microscopic âracetracksâ that trap and amplify light with exceptional efficiency. By using smooth curves inspired by highway engineering, they reduced energy loss and kept light circulating longer inside the device. Fabricated with sub-nanometer precision, the resonators rank among the top performers made from chalcogenide glass. The technology could lead to compact sensors, microlasers, and advanc

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