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Theory of radiation trapping by the accelerating solitons in optical fibers
We present a theory describing trapping of the normally dispersive radiation by the Raman solitons in optical fibers. Frequency of the radiation component is continuously blueshifting, while the soliton is redshifting....
Theory of radiation trapping by the accelerating solitons in optical fibers
We present a theory describing trapping of the normally dispersive radiation by the Raman solitons in optical fibers. Frequency of the radiation component is continuously blueshifting, while the soliton is redshifting....
[18F]-AV-1451 binding in the substantia nigra as a marker of neuromelanin in Lewy body diseases.
Elijah Mak, Antonina Kouli, Negin Holland, Nicolas Nicastro, George Savulich, Ajenthan Surendranathan, Maura Malpetti, Roido Manavaki, Young T Hong, Tim D Fryer, Franklin Aigbirhio, James B Rowe, John T O'Brien, Caroline H Williams-Gray
Sep 05, 2021
While [18F]-AV-1451 was developed as a PET radiotracer with high affinity for hyperphosphorylated tau, it has been proposed that loss of 'off-target' [18F]-AV-1451 binding to neuromelanin in the substantia nigra could be a...
[18F]AV-1451 binding is increased in frontotemporal dementia due to C9orf72 expansion.
Richard W Bevan-Jones, Thomas E Cope, Simon P Jones, Luca Passamonti, Young T Hong, Tim Fryer, Robert Arnold, Jonathan P Coles, Franklin A Aigbirhio, Karalyn Patterson, John T O'Brien, James B Rowe
Nov 29, 2018
The PET ligand [18F]AV-1451 was developed to bind tau pathology in Alzheimer's disease, but increased binding has been shown in both genetic tauopathies and in semantic dementia, a disease strongly associated with TDP-43...
Rare Diseases Brain Disorders Dementia Acquired Cognitive Impairment aging Neurodegenerative Neurosciences Alzheimer's Disease Alzheimer's Disease Related Dementias (ADRD) Alzheimer's Disease including Alzheimer's Disease Related Dementias (AD/ADRD) frontotemporal dementia (FTD) 2 Aetiology 2.1 Biological and endogenous factors Neurological
Monolayer Kagome metals AV<sub>3</sub>Sb<sub>5</sub>.
Recently, layered kagome metals AV3Sb5 (A = K, Rb, and Cs) have emerged as a fertile platform for exploring frustrated geometry, correlations, and topology. Here, using first-principles and mean-field...
Published by: Nature Communications
Systematic biases in determining dust attenuation curves through galaxy SED fitting
Jianbo Qin, Xian Zhong Zheng, Min Fang, Zhizheng Pan, Stijn Wuyts, Yong Shi, Yingjie Peng, Valentino Gonzalez, Fuyan Bian, Jia-Sheng Huang, Qiu-sheng Gu, Wenhao Liu, Qinghua Tan, Dong Dong Shi, Jian Ren, Yuheng Zhang, Man Qiao, Run Wen, Shuang Liu
Mar 31, 2022
While the slope of the dust attenuation curve (δ) is found to correlate with effective dust attenuation (AV) as obtained through spectral energy distribution (SED) fitting, it remains unknown how the fitting degeneracies shape...
Systematic biases in determining dust attenuation curves through galaxy SED fitting
Jianbo Qin, Xian Zhong Zheng, Min Fang, Zhizheng Pan, Stijn Wuyts, Yong Shi, Yingjie Peng, Valentino Gonzalez, Fuyan Bian, Jia-Sheng Huang, Qiu-sheng Gu, Wenhao Liu, Qinghua Tan, Dong Dong Shi, Jian Ren, Yuheng Zhang, Man Qiao, Run Wen, Shuang Liu
Mar 31, 2022
While the slope of the dust attenuation curve (δ) is found to correlate with effective dust attenuation (AV) as obtained through spectral energy distribution (SED) fitting, it remains unknown how the fitting degeneracies shape...
Neuroinflammation and protein aggregation co-localize across the frontotemporal dementia spectrum.
W Richard Bevan-Jones, Thomas E Cope, P Simon Jones, Sanne S Kaalund, Luca Passamonti, Kieren Allinson, Oliver Green, Young T Hong, Tim D Fryer, Robert Arnold, Jonathan P Coles, Franklin I Aigbirhio, Andrew J Larner, Karalyn Patterson, John T O'Brien, James B Rowe
Apr 17, 2020
The clinical syndromes of frontotemporal dementia are clinically and neuropathologically heterogeneous, but processes such as neuroinflammation may be common across the disease spectrum. We investigated how neuroinflammation...
Published by: Brain : a journal of neurology
Graphene plasmonic waveguides for mid-infrared supercontinuum generation on a chip
Andrey V. Gorbach
Jul 23, 2015
Using perturbation expansion of Maxwell equations with the nonlinear boundary condition, a generic propagation equation is derived to describe nonlinear effects, including spectral broadening of pulses, in graphene surface...
Microfiber-Lithium Niobate on Insulator Hybrid Waveguides for Efficient and Reconfigurable Second-Order Optical Nonlinearity on a Chip
We present an optical microfiber-lithium niobate on insulator (MF-LNOI) hybrid waveguide for efficient second-order nonlinear processes. The structure combines the advantages of low-loss fiber and high-nonlinearity waveguide...
Graphene plasmonic waveguides for mid-infrared supercontinuum generation on a chip
Andrey V. Gorbach
Jul 23, 2015
Using perturbation expansion of Maxwell equations with the nonlinear boundary condition, a generic propagation equation is derived to describe nonlinear effects, including spectral broadening of pulses, in graphene surface...
Nonlinear graphene plasmonics
A.V. Gorbach
Jan 25, 2013
Using perturbation expansion of Maxwell equations, an amplitude equation is derived for nonlinear transverse magnetic (TM) and transverse electric (TE) surface plasmon waves supported by graphene. The equation describes the...
Nonlinear graphene plasmonics
A.V. Gorbach
Jan 25, 2013
Using perturbation expansion of Maxwell equations, an amplitude equation is derived for nonlinear transverse magnetic (TM) and transverse electric (TE) surface plasmon waves supported by graphene. The equation describes the...
Graphene-clad tapered fiber
We derive a pulse propagation equation for a graphene-clad optical fiber, treating the optical response of the graphene and nonlinearity of the dielectric fiber core as perturbations in asymptotic expansion of Maxwell equations....
Surface-induced nonlinearity enhancement in subwavelength rod waveguides
We develop a perturbative theory to describe optical propagation in subwavelength rod waveguides. In this approach, we account for loss and nonlinearity in the boundary conditions. A comparison to the traditional perturbative...
Dispersion of nonlinearity in subwavelength waveguides
Description of pulse propagation in waveguides with subwavelength features and high refractive index contrasts requires an accurate account of the dispersion of nonlinearity due to the considerable mode profile variation with...
Coupled spatial multimode solitons in microcavity wires
A modal expansion approach is developed and employed to investigate and elucidate the nonlinear mechanism behind the multistability and formation of coupled multimode polariton solitons in microcavity wires. With pump...
Dark solitons and vortices in the intrinsic bistability regime in exciton polariton condensates
We report on a class of dark solitons and vortices existing in the exciton-polariton condensates and having discontinuity in their excitonic component. These solutions exist due to an intrinsic bistability of the exciton...
Raman solitons in waveguides with simultaneous quadratic and Kerr nonlinearities
We analyze Raman-induced self-frequency shift in two-component solitons supported by both quadratic and cubic nonlinearities. Treating Raman terms as a perturbation, we derive expressions for soliton velocity and frequency...
Microfiber-Lithium Niobate on Insulator Hybrid Waveguides for Efficient and Reconfigurable Second-Order Optical Nonlinearity on a Chip
We present an optical microfiber-lithium niobate on insulator (MF-LNOI) hybrid waveguide for efficient second-order nonlinear processes. The structure combines the advantages of low-loss fiber and high-nonlinearity waveguide...
Dark solitons and vortices in the intrinsic bistability regime in exciton polariton condensates
We report on a class of dark solitons and vortices existing in the exciton-polariton condensates and having discontinuity in their excitonic component. These solutions exist due to an intrinsic bistability of the exciton...
Dispersion of nonlinearity and modulation instability in subwavelength semiconductor waveguides
Tight confinement of light in subwavelength waveguides induces substantial dispersion of their nonlinear response. We demonstrate that this dispersion of nonlinearity can lead to the modulational instability in the regime of...
Parametric instabilities of microcavity polaritons in a periodic potential
We analyze parametric instabilities of microcavity polartions in the presence of one-dimensional periodic potentials. Instabilities appear in a certain window of pump momentum orientations with respect to the potential so that...
Perturbation theory for graphene-integrated waveguides
We present perturbation theory for analysis of generic third-order nonlinear processes in graphene-integrated photonic structures. The optical response of graphene is treated as the nonlinear boundary condition in Maxwell's...
Spontaneous parametric down-conversion in asymmetric couplers
We analyze the process of photon-pair generation via spontaneous parametric down-conversion in a quadratic nonlinear asymmetric waveguide coupler. The two waveguides have different geometry, such that light coupling only occurs...
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