Formation of bowtie‐shaped excitation in a photonic–microfluidic integrated devices

Abstract Narrowly confining the beam intensity in a well‐defined region in the center of cell flow is a necessary step to perform reliable flow cytometry testing but has so far not been achieved in a photonic–microfluidic integrated device.We were able to focus the excitation beam to a very narrow bowtie shape with a near uniform intensity across the flow stream for excitation for a flow cytometry application. Beam geometry was achieved by …