Analysis of Enhanced Two-Photon Absorption in Tapered Optical Fibers
Hao You, S.M. Hendrickson, and J.D. Franson
TL;DR
This paper investigates how tapering optical fibers enhances two-photon absorption by increasing evanescent field overlap and reducing mode volume, optimizing fiber diameter for maximum absorption efficiency.
Contribution
It provides a detailed analysis of two-photon absorption enhancement in tapered fibers and identifies optimal diameters for maximizing absorption rates.
Findings
Two-photon absorption rate increases with smaller fiber diameters.
Optimal taper diameter enhances evanescent field overlap.
Enhanced absorption improves potential applications in nonlinear optics.
Abstract
We analyze the rate of two-photon absorption in tapered optical fibers with diameters less than the wavelength of the incident light. The rate of two-photon absorption is shown to be enhanced due to the small mode volume of the tapered fiber and the relatively large overlap of the evanescent field with an atomic vapor that surrounds the tapered region. The two-photon absorption rate is optimized as a function of the diameter of the tapered region.
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