title: Microfluidic sorting with blinking optical traps.
abstract: It is shown that by appropriately choosing the periodicity of a blinking optical trap only larger sized colloidal spheres can be selectively trapped out of a mixed population. This happens because smaller sized, more agile, spheres escape out of the trap volume during the off period of the trap beam. Therefore, by scanning an array of blinking traps over a mixed sample, bigger spheres can be forced to move with the traps and eventually could be taken to the output side. Experimental demonstration of sorting between 1 µm and 2 µm diameter silica spheres is presented.
authors.affiliation: Laser Biomedical Applications and Instrumentation Division, Raja Ramanna Center for Advanced Technology, Indore, India. raktim@rrcat.gov.in
authors.forename: R
authors.initials: R
authors.lastname: Dasgupta
authors.forename: R S
authors.initials: RS
authors.lastname: Verma
authors.forename: P K
authors.initials: PK
authors.lastname: Gupta
mesh_terms: D046210:Microfluidic Analytical Techniques; D052898:Optical Tweezers; D010316:Particle Size; D012822:Silicon Dioxide / Q000737:chemistry
chemical_list: D012822:Silicon Dioxide