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Computer Optics

Spectral features of spontaneous four-wave mixing in tapered nanofibers

Anatoly Shukhin, А. А. Калачев

Published Jan 1, 2016• 0 citations
Publisher

Abstract

Features of biphoton states generated via spontaneous four-wave mixing in tapered nanofibers are studied. The spectral amplitude of a biphoton field is calculated and the effect of interference of the biphoton field in such structures is discussed. The effect of nanofiber environment on the spectral amplitude of the biphoton field is investigated.

DOI
10.18287/2412-6179-2016-40-2-141-146

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Features of biphoton states generated via spontaneous four-wave mixing in tapered nanofibers are studied. The spectral amplitude of a biphoton field is calculated and the effect of interference of the biphoton field in such structures is discussed. The effect of nanofiber environment on the spectral amplitude of the biphoton field is investigated.
Abstract Joint spectral intensity of the biphoton field generated via spontaneous four-wave mixing in an optical nanofiber was studied both experimentally and theoretically. The measured two-photon frequency distribution agrees well with the theoretically expected one that is calculated taking into account the spatially inhomogeneous profile of the taper. It is shown that measuring joint spectral intensity of the biphoton field makes it possible to determine the nanofiber radius with high accuracy.
A theory of single-photon sources of light is developed on the basis of spontaneous four-wave mixing in optical nanofibers. The spectral amplitude of the biphoton field is calculated with allowance for the real geometry of a nanofiber manufactured from standard optical fiber by heating and stretching. It is shown that by selecting pump parameters, we can simultaneously obtain the high spectral brightness and low frequency correlation of generated biphoton states in a nondegenerate mode of four-wave mixing that corresponds to single-photon states with the high purity.
Abstract Spontaneous four-wave mixing (SFWM) in optical micro-/nanofibers is studied theoretically and experimentally. Joint spectral intensity of the biphoton field generated via SFWM under excitation of femtosecond laser pulses is measured and calculated considering self-phase modulation of the pump pulses and SFWM throughout the tapered fibers. In comparison with the previous study (Shukhin et al 2020 Phys. Rev. A 101 053822), replacing picosecond pump by a femtosecond one with the same average power makes it possible to increase the photon pair generation rate tenfold.
We study the generation of frequency nondegenerate correlated photon pairs and heralded single photons via spontaneous four-wave mixing (SFWM) in a series of identical micro- or nanofibers (MNFs). Joint spectral intensity of the biphoton field generated at wavelengths of about 880 and 1310 nm has been measured under excitation by 100-ps laser pulses demonstrating good agreement with the theoretical prediction. The measured zero-time second-order autocorrelation function was about 0.2 when the emission rate of the heralded photons was of 4 Hz. The MNF-based source perfectly matches standard single-mode fibers, which makes it compatible with the existing fiber communication networks. In addition, SFWM observation in a series of identical MNFs allows for increasing the generation rate of single photons via spatial multiplexing.