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Linear and nonlinear absorption of a series of new donor-pi-acceptor polymethines with different lengths of conjugation are investigated and include quantum chemical analysis. Two-photon absorption cross-sections as large as 11,000 GM and solvatochromism are observed.
We present a monolithically integrated near-infrared fluorescence sensor incorporating a dielectric emission filter for in vivo applications. We successfully integrated a dielectric emission filter (OD3) onto a low-noise detector and sensed 50 nM fluorescent dye concentration.
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