Results 61 to 70 of about 13,719,025 (270)
New Journal of Physics, 2013 Strain nano-engineering provides valuable opportunities to create high-performance nanodevices by a precise tailoring of semiconductor band structure.
Alvarado Tarun +5 more
doaj +1 more source
Annales de l'Institut Henri Poincaré C, Analyse non linéaire, 2014 We present an abstract method in the setting of compact metric spaces which is applied to solve a number of problems in geometric optics. In particular, we solve the one source near field refraction problem. That is, we construct surfaces separating two homogeneous media with different refractive indices that refract radiation emanating ...
Gutiérrez, Cristian E., Huang, Qingbo
openaire +4 more sources
Power Scaling Laws and Near-Field Behaviors of Massive MIMO and Intelligent Reflecting Surfaces [PDF]
IEEE Open Journal of the Communications Society, 2020 The use of large arrays might be the solution to the capacity problems in wireless communications. The signal-to-noise ratio (SNR) grows linearly with the number of array elements $N$ when using Massive MIMO receivers and half-duplex relays.
Emil Björnson, L. Sanguinetti
semanticscholar +1 more source
True near field versus contrast near field imaging
Optics Express, 2006 We demonstrate that in near field imaging, interaction between light and sample can be divided into two main areas: the true near field and the contrast near field domain. We performed extensive numerical simulations in order to identify the limits of these areas, and to investigate contrast near field imaging in which much easier propagation ...
Masson, Jean-Baptiste, Gallot, Guilhem
openaire +3 more sources
Waveguide group velocity determination by spectral interference measurements in near-field optical scanning microscopy [PDF]
, 2006 Measurement of spectral interference with a near-field scanning optical microscope is used to determine directly the variation of group velocity between modes of a planar slab waveguide as the modes propagate along the ...
J.J. Baumberg +13 more
core +1 more source
Shock and Vibration, 2018 With the combination of model experiment and numerical simulation, we explore the effect of collapse height, weight, and pipe-soil stiffness ratio on dynamic strain of shallow buried metal pipe under the collapse impact load.
Min Wang +5 more
doaj +1 more source
Modeling of Subwavelength Gratings: Near-Field Behavior
Photonics, 2023 Subwavelength gratings have received considerable attention in the fields of photonics, optoelectronics, and image sensing. This paper presents simple analytical expressions for the near-field intensity distribution of radiation scattered by these ...
Alexander Chernyavsky +3 more
doaj +1 more source
LOS/NLOS Near-Field Localization with a Large Reconfigurable Intelligent Surface
IEEE Transactions on Wireless Communications, 2021 This paper considers a scenario where a reconfigurable intelligent surface (RIS) is deployed to allow the localization of mobile users adopting a single anchor node, even under non-line-of-sight (NLOS) channel conditions.
D. Dardari +3 more
semanticscholar +1 more source
Near-Field Analysis of Terahertz Pulse Generation From Photo-Excited Charge Density Gradients [PDF]
, 2015 Excitation of photo-current transients at semiconductor surfaces by subpicosecond optical pulses gives rise to emission of electromagnetic pulses of terahertz (THz) frequency radiation.
Natrella, M +12 more
core +1 more source
Near-field Probing of Optical Superchirality for Enhanced Bio-detection [PDF]
, 2022 Nanophotonic platforms in theory uniquely enable < femtomoles of chiral biological and pharmaceutical molecules to be detected, through the highly localised changes in the chiral asymmetries of the near-fields that they induce.
Rebecca Clarke (3740152) +9 more
core +1 more source