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A dynamic strategy for wavelength sensing using the diffracted orders of a grating

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Abstract

We propose a strategy for real time multicolour detection of light emitting particles under flow conditions, using the diffracted orders of a grating. The method relies on the fact that the spatial (angular/linear) separation between the orders of a diffraction grating is a wavelength dependent quantity. Thus, the difference in arrival times at a fixed detector for neighbouring orders produced by a moving, light-emitting particle can be used as a wavelength sensing mechanism. We demonstrate this functionality using a prototype PDMS microfluidic device that incorporates a focusing transmission grating. A key attribute of this approach is that it requires only a single sensitive detector, such as a photomultiplier tube, in contrast to many conventional approaches which require multiple sensitive detectors or a detector array.

Graphical abstract: A dynamic strategy for wavelength sensing using the diffracted orders of a grating

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Publication details

The article was received on 10 Mar 2017, accepted on 12 Apr 2017 and first published on 10 May 2017


Article type: Paper
DOI: 10.1039/C7LC00259A
Citation: Lab Chip, 2017, Advance Article
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    A dynamic strategy for wavelength sensing using the diffracted orders of a grating

    S. M. Azmayesh-Fard, A. Melnyk, L. Lam, T. Allen, R. Fedosejevs and R. G. DeCorby, Lab Chip, 2017, Advance Article , DOI: 10.1039/C7LC00259A

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