A double-clad photonic crystal fiber was used to improve detection efficiency over a standard single-mode fiber in a two-photon fluorescence detection scheme in which the dye was excited and the fluorescence was detected back through the same fiber.
© 2003 Optical Society of America
M. T. Myaing, J. Y. Ye, T. B. Norris, T. Thomas, J. R. Baker, Jr., W. J. Wadsworth, G. Bouwmans, J. C. Knight, and P. St. J. Russell, "Enhanced two-photon biosensing with double-clad photonic crystal fibers," Opt. Lett. 28, 1224-1226 (2003)