Engineers have demonstrated that a tiny loop etched into a glass chip can keep light circling far longer than similar devices.
That extended circulation concentrates energy inside a space thinner than a human hair, pointing toward smaller, more efficient sensors and light-based devices.
Inside the slender oval loop carved into the chip, laser light circled repeatedly instead of leaking away at each turn.
By analyzing the sharp signal dips produced by that circulation, Bright Lu at the University of Colorado Boulder (CU Boulder) connected the unusually long-lived light directly to reduced bending loss within the loop.
Gentle curves guided photons through each lap without the abrupt kicks that usually push them outward, so more of the original light survived every round trip.
Keeping light trapped this effectively raised intensity without demanding excessive power, setting the stage for the design choices that made those smooth turns possible.
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