Results 91 to 100 of about 3,408 (306)

Femtosecond Pulse Shaping with Semiconductor Huygens' Metasurfaces

Advanced Optical Materials, EarlyView.
Spatially variant silicon Huygens' metasurfaces enable femtosecond pulse shaping by tailoring the spectral phase and amplitude of incident pulses. Two key functionalities are demonstrated: temporal stretching and pulse splitting of an input Gaussian pulse.
Katsuya Tanaka, Dennis Arslan, Maximilian Weissflog, Nils Geib, Kristin Gerold, Adriana Szeghalmi, Mario Ziegler, Falk Eilenberger, Thomas Pertsch, Roland Schiek, Isabelle Staude   +10 more
wiley   +1 more source

Integral transformation for nonlinear oscillators

Journal of Low Frequency Noise, Vibration and Active Control
This paper introduces a generalized integral transform that encompasses the Laplace, Fourier, and numerous contemporary integral transforms as particular instances, while preserving their defining characteristics.
Xue-Chen Dong, Qiu-Yu Ou, Yi-Han Wu, Jiahui Yu   +3 more
doaj   +1 more source

Multiple Incoherent Deconvolutions for Improving the Image Resolution of Diffraction‐Limited Imaging Systems

Advanced Photonics Research, EarlyView.
Multiple incoherent nonlinear deconvolutions (MIND) has extended dimension for optimization that provides a better solution than Wiener deconvolution and nonlinear reconstruction. MIND minimizes deconvolution noise by averaging over multiple deconvolutions each with different system aperture that effectively enhances the resolution.
Jawahar Prabhakar Desai, Vijayakumar Anand, Joseph Rosen   +2 more
wiley   +1 more source

Effect of Core Geometry on Frequency Correlations and Channel Capacity of a Multimode Optical Fiber

Advanced Photonics Research, EarlyView.
Structured wavefronts focused at the output of multimode fibers reveal a distinct spatial dependence of frequency correlation bandwidth between circular and rectangular cores. Unlike conventional circular‐core fibers, rectangular‐core fibers maintain uniform bandwidth across all transverse locations, enabling over a 20% increase in channel capacity for
Henry C. Hammer, Ravitej Uppu
wiley   +1 more source

A Novel Approach to the Fractional Laplacian via Generalized Spherical Means

Fractal and Fractional
Although at least ten equivalent definitions of the fractional Laplacian exist in unbounded domains, we introduce an additional equivalent definition based on the generalized spherical mean-value operator—a Fourier multiplier operator involving the ...
Fethi Bouzeffour
doaj   +1 more source

Low‐Loss Parowax‐Imprinted Diffractive Neural Network for Orbital Angular Momentum Terahertz Holographic Imaging

Advanced Photonics Research, EarlyView.
This work introduces a low‐loss diffractive neural network, fabricated using an imprinting technique with parowax material, for recognizing and manipulating the topological charge of orbital angular momentum (OAM) waves. It is also demonstrated that the low‐loss diffractive network can perform mathematical operations based on the topological charges of
Wei Jia, Miguel A. Gomez, Steve Blair, Michael A. Scarpulla, Berardi Sensale‐Rodriguez   +4 more
wiley   +1 more source

Some New Multipliers of Fourier Series [PDF]

Proceedings of the American Mathematical Society, 1987
Let L 1 {L^1} be the space of all complex-valued 2 π 2\pi -periodic integrable functions f f and let L 1 ^ \widehat {{L^1}} be the space ...
openaire   +2 more sources

Spherical and Aspherical Lenses for Boosting the Performance of Terahertz Imaging Systems

Advanced Photonics Research, EarlyView.
This study investigates the enhancement of terahertz (THz) detection through the terajet effect using mesoscale dielectric lenses of various geometries. Spherical, aspherical, and cubic polytetrafluoroethylene lenses are evaluated at 0.15 and 0.3 THz, demonstrating significant improvements in responsivity and noise reduction.
El Hadj Abidi, Jaime Calvo‐Gallego, Alejandro Schulman, Miguel Ferrando‐Bataller, Oleg V. Minin, Igor V. Minin, Jesus E. Velázquez‐Pérez, Yahya Moubarak Meziani   +7 more
wiley   +1 more source

Bayesian Parameterization of Continuum Battery Models from Featurized Electrochemical Measurements Considering Noise**

Batteries &Supercaps, Volume 6, Issue 1, January 2023., 2023
We introduce a computer algorithm that incorporates the experience of battery researchers to extract information from experimental data reproducibly. This enables the fitting of complex models that take up to a few minutes to simulate. For validation, we process full‐cell GITT measurements to characterize the diffusivities of both electrodes non ...
Yannick Kuhn, Hannes Wolf, Arnulf Latz, Birger Horstmann   +3 more
wiley   +1 more source

Stabilization of a Rao–Nakra Sandwich Beam System by Coleman–Gurtin’s Thermal Law and Nonlinear Damping of Variable-Exponent Type

Journal of Mathematics
In this paper, we explore the asymptotic behavior of solutions in a thermoplastic Rao–Nakra (sandwich beam) beam equation featuring nonlinear damping with a variable exponent.
Mohammed M. Al-Gharabli, Shadi Al-Omari, Adel M. Al-Mahdi   +2 more
doaj   +1 more source