Fiber based polarization filter for radially and azimuthally polarized light

Jocher, Christoph; Jáuregui, César; Voigtländer, Christian; Stutzki, Fabian; Nolte, Stefan; Limpert, Jens; Tünnermann, Andreas

doi:10.1364/oe.19.019582

Cited by 28 publications

(15 citation statements)

References 18 publications

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“…The electric field is azimuthally polarized (see Fig. 1c–e), similar to the TE 01 mode of a conventional fiber52, where the refractive index of the core is higher than that of the cladding. Azimuthal polarization would prevent modal dispersion in the birefringent myelin sheath, whose optic axes point in the radial direction53.…”

Section: Resultsmentioning

confidence: 83%

Possible existence of optical communication channels in the brain

Kumar

Boone

Tuszyński

et al. 2016

Sci Rep

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Given that many fundamental questions in neuroscience are still open, it seems pertinent to explore whether the brain might use other physical modalities than the ones that have been discovered so far. In particular it is well established that neurons can emit photons, which prompts the question whether these biophotons could serve as signals between neurons, in addition to the well-known electro-chemical signals. For such communication to be targeted, the photons would need to travel in waveguides. Here we show, based on detailed theoretical modeling, that myelinated axons could serve as photonic waveguides, taking into account realistic optical imperfections. We propose experiments, both in vivo and in vitro, to test our hypothesis. We discuss the implications of our results, including the question whether photons could mediate long-range quantum entanglement in the brain.

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Section: Resultsmentioning

confidence: 83%

Possible existence of optical communication channels in the brain

Kumar

Boone

Tuszyński

et al. 2016

Sci Rep

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“…For shorter wavelengths of 450-800 nm, the neff is in the order of 10 -4 , while for longer wavelengths up to 1.5 µm, the neff is up to the order of 10 -3 . The reported highest neff achieved for the fibers are in order of 10 -4 at 1500 nm and 1030 nm wavelengths, respectively [19,20] (red spot [19] and black spot [20] in Fig. 3 for comparison).…”

Section: A Impact Of Wavelength On Neffmentioning

confidence: 91%

“…As a result, these modes are very sensitive to perturbations and the energy from one mode readily couples to the other mode, resulting in modes degeneracy and the formation of linearly polarized (referred as LP-modes) Hermite-Gaussian-like beams [19] which has fields distribution in two lobes and cannot efficiently switch off the fluorescence emission of the fluorophore in STED application. Significant differences in the propagation constants of the CV modes in a fiber are essential [19,20] for high stability doughnut-shape mode propagation. Fibers with high numerical aperture (NA) have larger neff for higher order modes [20], which suggests a large core-cladding index contrast will support the more stable propagation of higher order modes.…”

Section: Introductionmentioning

confidence: 99%

“…Significant differences in the propagation constants of the CV modes in a fiber are essential [19,20] for high stability doughnut-shape mode propagation. Fibers with high numerical aperture (NA) have larger neff for higher order modes [20], which suggests a large core-cladding index contrast will support the more stable propagation of higher order modes. Specialty optical fiber can be designed with multilayer cladding of high material index contrast [19] to maximize the difference between the effective index of different modes and hence support the stable propagation of discrete higher order modes.…”

Section: Introductionmentioning

confidence: 99%

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Suspended Core Fibers for the Transmission of Cylindrical Vector Modes

Ruan

Afshar

et al. 2016

J. Lightwave Technol.

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Abstract-This paper presents a study of propagation of radially and azimuthally polarized cylindrical vector modes in six-strut suspended core fibers based on finite element simulations. The study shows large effective index differences in order of 10 -3 -10 -2 of these modes can be achieved in the suspended core fibers with core diameter of less than 2 m, material index 1.45 of silica to 2.0 of tellurite and wavelength of 750 nm, allowing the stable propagation of the first higher order modes in doughnut shape within these fibers. The effective index difference and the field intensity of these cylindrical vector modes can be tuned by selecting appropriate fiber material and core size. The study shows that the suspended core fiber can be a competitive candidate for fiber-based highresolution stimulated emission depletion (STED) nanoscopy application.Index Terms-Fiber optics, fibers polarization maintaining, fiber fluorescence microscopy, laser beam shaping, optical vortices, optical fiber device, polarization-selective devices.

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“…On the other hand, the direct generation of such beams from laser cavities/amplifiers offers advantage of higher mode purity and much higher power scalability. The underlying mechanism in this instance is to provide higher net gain for the specific mode relative to all others by using specially designed mode selective bulk or fibre-based optical elements within the laser cavity/amplifier [19][20][21][22][23][24][25][26][27][28][29] .…”

mentioning

confidence: 99%

Reconfigurable structured light generation in a multicore fibre amplifier

et al. 2020

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Structured light, with spatially varying phase or polarization distributions, has given rise to many novel applications in fields ranging from optical communication to laser-based material processing. However the efficient and flexible generation of such beams from a compact laser source at practical output powers still remains a great challenge. Here we describe an approach capable of addressing this need based on the coherent combination of multiple tailored Gaussian beams emitted from a multicore fibre (MCF) amplifier. We report a proofof-concept structured light generation experiment, using a cladding-pumped 7-core MCF amplifier as an integrated parallel amplifier array and a spatial light modulator (SLM) to actively control the amplitude, polarization and phase of the signal light input to each fibre core. We report the successful generation of various structured light beams including highorder linearly polarized spatial fibre modes, cylindrical vector (CV) beams and helical phase front optical vortex (OV) beams.

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Fiber based polarization filter for radially and azimuthally polarized light

Cited by 28 publications

References 18 publications

Possible existence of optical communication channels in the brain

Possible existence of optical communication channels in the brain

Suspended Core Fibers for the Transmission of Cylindrical Vector Modes

Reconfigurable structured light generation in a multicore fibre amplifier

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