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‘Embedded eigenvalue’ holds promise for sensors, lasers, more

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There are several ways to confine light, but a new approach uses two waves of the same length, but exactly opposite phases, to cancel each other out, allowing light of other wavelengths to pass freely. In mathematical terms, the new phenomenon – where one frequency of light is trapped while other nearby frequencies are not – is an example of an “embedded eigenvalue.” While this had been described as a theoretical possibility in 1929 by mathematician and computational pioneer John von Neumann, it had yet to be seen in practice. Beams of light are usually...Read full article

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