Applied Physics

Holographic Sensors

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Science  15 Jul 2005:
Vol. 309, Issue 5733, pp. 357
DOI: 10.1126/science.309.5733.357b

Chemical sensors generally depend on the response of an absorbing or adsorbing material when it is exposed to the chemical of interest. Optimum performance is usually a trade-off between sensitivity and response time. Ye et al. describe a chemical sensor, based on holographic interferometry, in which the presence of a chemical on a suitably sensitive material results in a detectable shift in the optical path length through that material. The use of holography allows a large area to be scanned at one time, which offers the potential of storing a two-dimensional odor image in the hologram. They demonstrate the ability to sense ethyl alcohol down to the level of 40 parts per billion, with a relatively fast measurement window of 5 s—a response time that may allow dynamical sensing to be achieved. — ISO

Opt. Lett. 30, 1467 (2005).

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