Emergence of Geometrical Optical Nonlinearities in Photonic Crystal Fiber Nanowires

Biancalana, Fabio; Tran, Truong X.; Stark, Sebastian; Schmidt, Markus A.; Russell, P. St. J.

doi:10.1103/physrevlett.105.093904

Cited by 34 publications

(26 citation statements)

References 21 publications

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“…This enhancement of the z-component is even stronger for smaller cores. In order to take into account the above-mentioned distinguishing features of fibers with sub-wavelength core, in our works [20,21] we describe the variations of the normalized EM modeˆ e ω ( r ⊥ ) (where r ⊥ are the transverse coordinates) with respect to the frequency ω through the Taylor series:…”

Section: Ii1 Light Propagation Equation In Fibers With Sub-wavelengmentioning

confidence: 99%

“…In this Section we review our works on the new equation governing light propagation in optical fibers with sub-wavelength core [20] and the new kind of nonlinearity emerging in these fibers [21].…”

Section: New Nonlinearity In Photonic Nanowiresmentioning

confidence: 99%

“…The generalized nonlinear coefficient γ jhpv is defined as follows (see Refs. [20,21] for more details):…”

Section: Ii1 Light Propagation Equation In Fibers With Sub-wavelengmentioning

confidence: 99%

“…Inspired by these recent achievements, in our works [20,21] we have advanced further the theoretical understanding of the evolution equations in optical fibers with sub-wavelength core structures. In [20,21] we have derived a new, logically self-consistent forward-evolution equation for photonic nanowires, based on SVEA, that simultaneously takes into account (i) the vector nature of the EM field (polarization and z-component included), (ii) the strong dispersion of the nonlinearity inside the spectral body of the pulse, and (iii) the full variations of the vector mode profiles with frequency.…”

Section: Introductionmentioning

confidence: 99%

“…In [20,21] we have derived a new, logically self-consistent forward-evolution equation for photonic nanowires, based on SVEA, that simultaneously takes into account (i) the vector nature of the EM field (polarization and z-component included), (ii) the strong dispersion of the nonlinearity inside the spectral body of the pulse, and (iii) the full variations of the vector mode profiles with frequency. In all relevant previous works on the subject [16,[22][23][24][25], all these properties were not included in the derivation at the same time.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Optics in Waveguide Arrays and Photonic Nanowires

Truong¹

2017

Comm. in Phys.

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Abstract. In this paper we review our works in the field of nonlinear optics in waveguide arrays (WAs) and photonic nanowires. We first focus on the new equation governing light propagation in optical fibers with sub-wavelength cores which simultaneously takes into account (i) the vector nature of the electromagnetic modes inside fibers, (ii) the strong dispersion of the nonlinearity inside the spectral body of the pulse, (iii) and the full variations of the vector mode profiles with frequency. From this equation we have shown that a new kind of nonlinearity emerges in subwavelength-core fibers which can suppress the Raman self-frequency shift of solitons. We then discuss some nonlinear phenomena in WAs such as the emission of the diffractive resonant radiation from spatial discrete solitons and the anomalous recoil effect. Finally, we review our works on the optical analogues of Dirac solitons in quantum relativistic physics in binary waveguide arrays for both fundamental and higher-order solitons, and its interaction.

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Section: Ii1 Light Propagation Equation In Fibers With Sub-wavelengmentioning

confidence: 99%

Section: New Nonlinearity In Photonic Nanowiresmentioning

confidence: 99%

“…The generalized nonlinear coefficient γ jhpv is defined as follows (see Refs. [20,21] for more details):…”

Section: Ii1 Light Propagation Equation In Fibers With Sub-wavelengmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nonlinear Optics in Waveguide Arrays and Photonic Nanowires

Truong¹

2017

Comm. in Phys.

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Characterization of supercontinuum generation in a photonic crystal fiber for uses in multiplex CARS microspectroscopy

Falconieri

Marrocco

Merla

et al. 2019

J Raman Spectroscopy

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Coherent anti‐Stokes Raman scattering (CARS) is a versatile technique for vibrational imaging that can be realized by a simple setup using a single femtosecond laser oscillator. For such a layout, supercontinuum generation in a photonic crystal fiber (PCF) is commonly used to produce a broadband Stokes beam in the so‐called multiplex CARS spectroscopy; accordingly, characterization of the supercontinuum beam is a necessary requirement to perform controlled experiments. In this paper, we first perform simulations and characterizations of the supercontinuum spectra produced by a PCF in conditions encountered in a typical single‐oscillator multiplex CARS setup. Good agreement between the experimental and simulated supercontinuum spectra is obtained in the whole emission band and for different PCF working conditions, by accurate choice of the simulation input parameters and by accounting for the input beam chirp in the numerical code. The influence of PCF working conditions on the CARS signal measured on a reference sample is also shown. To this regard, we also study the long‐term stability of the Stokes beam and of the associated CARS signal, using the Allan variance to determine a limit to the acquisition time in CARS measurements. We show that Stokes and CARS long‐term spectral fluctuations are on a timescale of some minutes in our setup, setting an indicative limit to the practical acquisition time for reliable CARS measurements. Based on this work, good control over the measurement of vibrational bands by CARS microscopy can be achieved in view of optimized performances in specific spectral bands.

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Supercontinuum generation in photonic crystal fibers with nanoporous core made of soft glass

et al. 2011

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In this paper we report on the fabrication of a photonic crystal fiber with nanoporous core made of in-house synthesized silicate glass. The fiber uses three rings of holes around a core with a diameter of 4.7 μm. It effectively guides two modes with broadband flat normal dispersion and zero dispersion wavelengths at 1.0 and 1.6 μm. We have demonstrated supercontinuum generation in the range 600 – 940 nm with a spectral flatness variation below 8 dB when a fiber sample 23 cm long is pumped with 60 fs pulses with a central wavelength of 806 nm and pulse energy of 2.4 nJ.

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Emergence of Geometrical Optical Nonlinearities in Photonic Crystal Fiber Nanowires

Cited by 34 publications

References 21 publications

Nonlinear Optics in Waveguide Arrays and Photonic Nanowires

Nonlinear Optics in Waveguide Arrays and Photonic Nanowires

Characterization of supercontinuum generation in a photonic crystal fiber for uses in multiplex CARS microspectroscopy

Supercontinuum generation in photonic crystal fibers with nanoporous core made of soft glass

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