| abstract |
In one embodiment, an optical system includes a microfluidic chip assembly. The microfluidic chip assembly includes a first structure that provides a first wall of a fluid channel. A second structure provides a second wall of the fluid channel. The second structure includes a diffraction grating configured to provide, in the presence of incident light of a wavelength band of interest on a first surface of the second structure, a plurality of regions of high intensity light within the fluid channel. |