title: Material-specific detection and classification of single nanoparticles.
abstract: Detection and classification of nanoparticles are important for environmental monitoring, contamination mitigation, biological label tracking, and biodefense. Detection techniques involve a trade-off between sensitivity, discrimination, and speed. This paper presents a material-specific dual-color common-path interferometric detection system. Two wavelengths are simultaneously used to discriminate between 60 nm silver and 80 nm diameter gold particles in solution with a detection time of τ ≈ 1 ms. The detection technique is applicable to situations where both particle size and material are of interest.
authors.affiliation: Institute of Optics, University of Rochester, Rochester New York 14627, United States.
authors.forename: Steven
authors.initials: S
authors.lastname: Person
authors.forename: Bradley
authors.initials: B
authors.lastname: Deutsch
authors.forename: Anirban
authors.initials: A
authors.lastname: Mitra
authors.forename: Lukas
authors.initials: L
authors.lastname: Novotny
mesh_terms: D004867:Equipment Design; D006046:Gold / Q000737:chemistry*; D007368:Interferometry / Q000295:instrumentation*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D012834:Silver / Q000737:chemistry*
chemical_list: D012834:Silver; D006046:Gold