Results 81 to 90 of about 8,903 (251)

Subwavelength metasurfaces for quasi-omnidirectional broadband sound absorption at low frequencies

[EN] Subwavelength metasurfaces for quasi-omnidirectional broadband high absorption are designed to attenuate the low-frequency noise of around 100 Hz produced in industrial environments.
Ibarias-Alfaro, Martín Alfonso, Sánchez-Dehesa Moreno-Cid, José, Liang, Mengtao, Wu, Huagen   +3 more
core   +1 more source

Machine Learning Driven Inverse Design of Broadband Acoustic Superscattering

Advanced Intelligent Discovery, EarlyView.
Multilayer acoustic superscatterers are designed using machine learning to achieve broadband superscattering and strong sound insulation. By incorporating a weighted mean absolute error into the loss function, the forward and inverse neural networks accurately map structural parameters to spectral responses.
Lijuan Fan, Xiangliang Zhang, Ying Wu
wiley   +1 more source

Ultrasonic Rainbow: A Meta‐Transducer for Frequency‐Selective Elastic Wave Control via Dithering‐Based Wavenumber Tuning

Advanced Intelligent Systems, EarlyView.
A piezoelectric meta‐transducer generates an ultrasonic rainbow, steering guided elastic waves to different angles according to frequency. A dithering‐based binary electrode design enables a closer realization of the target wavenumber filter, improving directional purity and suppressing unwanted lobes. Numerical and experimental validation demonstrates
Masoud Mohammadgholiha, Jochen Moll, Kilian Tschöke, Carsten Kruska, Sylvia E. Gebhardt, Luca De Marchi   +5 more
wiley   +1 more source

Plasmonic Structures for Subwavelength Guiding and Enhanced Light-Matter Interactions

, 2018
In this dissertation we design and analyze nanostructures for subwavelength guiding and enhanced light-matter interactions. We first investigate three-dimensional plasmonic waveguide-cavity structures, built by side-coupling stub resonators that consist ...
Mahigir, Amirreza
core   +1 more source

Surface Charges Guided Quasi‐TEM‐mode Microwave Propagation along Dielectric Nanowire

Advanced Physics Research, EarlyView.
According to Maxwell's equations, a single‐conductor transmission line cannot allow TEM‐mode electromagnetic wave propagation, however, this is based upon the assumption that dielectric material is isolated from the environment. In practice, surface electrostatic charges widely existed in nano‐materials with large surface‐to‐volume ratio.
BoYan Xu, Kaibo Zhang, Haojie Gao, Zhiyuan Gao, Kai Wang, Lihuan Zhao, Qi Yang, Bifeng Cui   +7 more
wiley   +1 more source

Quantum limits of superresolution for imaging discrete subwavelength structures

Optics Express, 2007
We present the quantum theory of superresolution for discrete subwavelength structures. It allows to formulate, in particular, the standard quantum limit of superresolution achieved for illumination of the structure by light in coherent state. Our theory is based on discrete prolate spheroidal sequences and functions which are the proper basis set of ...
openaire   +2 more sources

Engineering Electromagnetic Wave Properties Using Subwavelength Antennas Structures

, 2015
With extraordinary properties, generation of complex electromagnetic field based on novel subwavelength antennas structures has attracted great attentions in many areas of modern nano science and technology, such as compact RF sensors, micro-wave ...
Wang, Shiyi
core  

Metalens‐Enabled Double‐Helix Point Spread Function for Multifunctional Imaging

Advanced Physics Research, EarlyView.
A single metalens is employed to generate a double‐helix point spread function (DH‐PSF). At the design wavelength, the PSF rotation angle varies linearly with depth, while the lobe spacing follows an inverse dependence on axial position. At a fixed depth, the lobe spacing further exhibits a linear dependence on wavelength due to dispersion.
Xuanyu Wu, Xuanguang Wu, Liang Zhou, Bingyan Wei, Sheng Liu, Dandan Wen, Yi Zhang, Jianlin Zhao, Peng Li   +8 more
wiley   +1 more source

Subwavelength Photonic Structures for Nonlinear Optical Functionalities

International audiencePeriodic subwavelength patterning of silicon enables the control of nonlinear effects with unprecedented flexibility. Here, we will present our most recent results on nonlinear supercontinuum generation and nonlinear Brillouin ...
Vivien, Laurent, Lanzillotti-Kimura, Norberto Daniel, Nuño Ruano, Paula, González-Andrade, David, Dinh, Thi Thuy Duong, Marris-Morini, Delphine, Zhang, Jianhao, Ferhart, Hiba El Batoul, Alonso Ramos, Carlos, Medina Quiroz, David, Cheben, Pavel, Cassan, Eric   +11 more
core   +1 more source

Guiding and Manipulating Light Fields in Microstructured Liquid Crystals

Advanced Physics Research, EarlyView.
This review summarizes recent advances in guided‐wave optics enabled by microstructured liquid crystal (LC) devices, covering their fundamental material properties, key degree of freedom for dynamic light field manipulations. The advances of linear guided‐wave optics, nonlinear‐optics with spatial optical solitons, and microlasers in LC‐based devices ...
Shan‐shan Chang, Yong‐shuai Li, Jin‐hui Chen   +2 more
wiley   +1 more source