Scatterings
Micro-harp Resonates to Sound Out Gases
Researchers at the Naval Research Laboratory have made a “micro-harp” that operates on a scale about a thousand times smaller than the normal instrument, with “strings” that are roughly 200 µm in length.
Micro-bridges resonate like harp strings in a tiny, reusable gas sensor. (a) Fiber-optic interrogation of a coated microharp via microcavity interferometry. (b) A photograph of a microharp following polymer deposition. (c) A scanning electron micrograph image of a gold microharp prior to polymer deposition.
A harp contains strings of different lengths, which resonate at different frequencies when plucked by a harpist. Researchers at the Naval Research Laboratory in Washington, D.C., have made a “micro-harp” that operates on a scale about a thousand times smaller than the normal instrument, with “strings” that are roughly 200 µm in length.
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