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Taking Two-Photon Excitation to Exceptional Path-Lengths in Photonic Crystal Fiber

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Euser,  Tijmen G.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Russell,  Philip St. J.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Williams, G. O. S., Euser, T. G., Arlt, J., Russell, P. S. J., & Jones, A. C. (2014). Taking Two-Photon Excitation to Exceptional Path-Lengths in Photonic Crystal Fiber. ACS PHOTONICS, 1(9), 790-793. doi:10.1021/ph5002236.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-65AD-A
Abstract
The well-known, defining feature of two-photon excitation (TPE) is the tight, three-dimensional confinement of excitation at the intense focus of a laser beam. The extremely small excitation volume, on the order of 1 mu m(3) (1 femtoliter), is the basis of far-reaching applications of TPE in fluorescence imaging, photodynamic therapy, nanofabrication, and three-dimensional optical memory. Paradoxically, the difficulty of detecting photochemical events in such a small volume is a barrier to the development of the two-photon-activated molecular systems that are essential to the realization of such applications. We show, using two-photon-excited fluorescence to directly visualize the excitation path, that confinement of both laser beam and sample solution within the 20 mu m hollow core of a photonic crystal fiber permits TPE to be sustained over an extraordinary path-length of more than 10 cm, presenting a new experimental paradigm for ultrasensitive studies of two-photon-induced processes in solution.