期刊
SCIENCE
卷 327, 期 5972, 页码 1485-1488出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1185117
关键词
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资金
- NSF [DMR-0120967]
- Defense Advanced Research Projects Agency (DARPA) [W31P4Q-09-1-0012]
- Office of Naval Research [N00014-04-0095, N00014-06-1-0897]
All-optical switching applications require materials with large third-order nonlinearities and low nonlinear optical losses. We present a design approach that involves enhancing the real part of the third-order polarizability (gamma) of cyanine-like molecules through incorporation of polarizable chalcogen atoms into terminal groups, while controlling the molecular length to obtain favorable one-and two-photon absorption resonances that lead to suitably low optical loss and appreciable dispersion enhancement of the real part of gamma. We implemented this strategy in a soluble bis(selenopyrylium) heptamethine dye that exhibits a real part of gamma that is exceptionally large throughout the wavelength range used for telecommunications, and an imaginary part of gamma, a measure of nonlinear loss, that is smaller by two orders of magnitude. This combination is critical in enabling low-power, high-contrast optical switching.
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