U.S. Navy researchers are asking two U.S.

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"We've now shown that both 2-D and 3-D acoustic cloaks theoretically do exist," Cummer said.

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The authors of [an earlier] paper concluded that you could either have perfect invisibility at one color, or imperfect invisibility at three colors.

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The new laser phenomenon has some interesting features. For instance, in a conventional laser relying on low-momentum electrons, electrons often reabsorb the emitted photons, and this reduces overall efficiency.

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Comparing the values of cloaking and resonance frequencies, it is seen that the values are interleaved with each other: it may be shown that in general, when passive materials are employed, there is always a resonant peak between two neighboring cloaking frequencies, and vice ver …

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A new optical fiber material could enable laser-based devices to be built operating at multiple frequencies. More Articles

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...theorists have predicted that, no matter how disordered these opaque scattering materials are, they still contain open channels that light could conceivably fit through.

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