Results 21 to 30 of about 3,089,831 (323)
Full‐Color Complex‐Amplitude Vectorial Holograms Based on Multi‐Freedom Metasurfaces [PDF]
Advanced Functional Materials, 2019 Phase, polarization, amplitude, and frequency represent the basic dimensions of light, playing crucial roles for both fundamental light–material interactions and all major optical applications.
Zi-lan Deng +11 more
semanticscholar +1 more source
A universal broadband and CEP stable seeder for high-power amplifiers [PDF]
EPJ Web of ConferencesThis work presents a universal seeder architecture based on filamentation and parametric amplification from an Ytterbium pump laser for the generation of pulses with versatile properties in terms of central wavelength, bandwidth, CEP, and contrast for ...
Maksimenka Raman +7 more
doaj +1 more source
Solving Systems of Random Quadratic Equations via Truncated Amplitude Flow [PDF]
IEEE Transactions on Information Theory, 2016 This paper presents a new algorithm, termed truncated amplitude flow (TAF), to recover an unknown vector $ {x}$ from a system of quadratic equations of the form $y_{i}=|\langle {a}_{i}, {x}\rangle |^{2}$ , where $ {a}_{i}$ ’s are given random ...
G. Wang, G. Giannakis, Yonina C. Eldar
semanticscholar +1 more source
Amplitude dependence of image quality in atomically-resolved bimodal atomic microscopy [PDF]
, 2016 In bimodal FM-AFM, two flexural modes are excited simultaneously. The total vertical oscillation deflection range of the tip is the sum of the peak-to-peak amplitudes of both flexural modes (sum amplitude).
Arai, Toyoko +5 more
core +2 more sources
Annales Henri Poincaré, 2017 In this work, we argue that the α′→0 limit of closed string theory scattering amplitudes is a tropical limit. The motivation is to develop a technology to systematize the extraction of Feynman graphs from string theory amplitudes at higher genus.
openaire +2 more sources
Experimental demonstration of a temporal pulse shaping method based on nonlinear chirp [PDF]
EPJ Web of ConferencesWe present a general temporal shaping method based on spectral phase-only modulation for ultrafast laser sources. We explain the working principle of this technique and use it experimentally to generate a ramp-shaped pulse at the output of a laser source
Parize Gautier +5 more
doaj +1 more source
Scalar-graviton amplitudes [PDF]
Journal of High Energy Physics, 2019 Abstract Using the CHY-formalism and its extension to a double cover we provide covariant expressions for tree-level amplitudes with two massive scalar legs and an arbitrary number of gravitons in D dimensions. Using unitarity methods, such amplitudes are needed inputs for the computation of post-Newtonian and post-Minkowskian ...
Bjerrum-Bohr, N. E. J. +3 more
openaire +7 more sources
Physics Reports, 2017 This a pedagogical introduction to scattering amplitudes in gauge theories. It proceeds from Dirac equation and Weyl fermions to the two pivot points of current developments: the recursion relations of Britto, Cachazo, Feng and Witten, and the unitarity cut method pioneered by Bern, Dixon, Dunbar and Kosower.
openaire +3 more sources
Positive amplitudes in the amplituhedron [PDF]
Journal of High Energy Physics, 2015 The all-loop integrand for scattering amplitudes in planar N = 4 SYM is determined by an "amplitude form" with logarithmic singularities on the boundary of the amplituhedron. In this note we provide strong evidence for a new striking property of the superamplitude, which we conjecture to be true to all loop orders: the amplitude form is positive when ...
Arkani-Hamed, Nima +2 more
openaire +6 more sources
Large-amplitude driving of a superconducting artificial atom: Interferometry, cooling, and amplitude spectroscopy [PDF]
, 2009 Superconducting persistent-current qubits are quantum-coherent artificial atoms with multiple, tunable energy levels. In the presence of large-amplitude harmonic excitation, the qubit state can be driven through one or more of the constituent energy ...
A. Fragner +96 more
core +2 more sources