Analysis of Enhanced Two-Photon Absorption in Tapered Optical Fibers

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.

arXiv comment14 pages, 4 figures

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• Enhanced Two-Photon Absorption Using Entangled States and Small Mode Volumes
• Saturation of atomic transitions using sub-wavelength diameter tapered optical fibers in rubidium vapor
• A simple, narrow, and robust atomic frequency reference at 993 nm exploiting the rubidium (Rb) $5S_{1/2}$ to $6S_{1/2}$ transition using one-color two-photon excitation
• Feasibility of single-photon cross-phase modulation using metastable xenon in a high finesse cavity
• Enhancement of broadband entangled two-photon absorption by resonant spectral phase flips
• Transmission characteristics of optical nanofibers in metastable xenon
• Entangling photons via the double quantum Zeno effect
• Joint effects of entanglement and symmetrization: physical properties and exclusion
• Atomic absorption and emission in non-product states