title: Prism-based multicolor fluorescence correlation spectrometer.
abstract: We report the design and application of a prism-based detection system for fluorescence (cross) correlation spectroscopy. The system utilizes a single laser wavelength for the simultaneous excitation of several dyes of different emission spectra. Fluorescence light is spectrally separated with a prismatic setup, and wavelengths are selected by scanning a fiber-coupled avalanche photodiode across the image spots. Multicolor autocorrelations are demonstrated with standard and tandem dyes, and fluorescence cross-correlation measurements of biotinylated nanocontainers and streptavidin are presented. This spectrometer offers high optical stability and no focal volume mismatch for the multicolor detection of molecular dynamics and interactions, with single-molecule sensitivity.
authors.affiliation: Department of Chemistry, National University of Singapore, Singapore.
authors.forename: Ling Chin
authors.initials: LC
authors.lastname: Hwang
authors.forename: Marcel
authors.initials: M
authors.lastname: Leutenegger
authors.forename: Michael
authors.initials: M
authors.lastname: Gösch
authors.forename: Theo
authors.initials: T
authors.lastname: Lasser
authors.forename: Per
authors.initials: P
authors.lastname: Rigler
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Meier
authors.forename: Thorsten
authors.initials: T
authors.lastname: Wohland
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D036641:Microscopy, Fluorescence, Multiphoton / Q000295:instrumentation* / Q000379:methods; D055095:Optics and Photonics / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation* / Q000379:methods; D013050:Spectrometry, Fluorescence / Q000295:instrumentation* / Q000379:methods