Results 51 to 60 of about 390,030 (355)

Nanofibers with Bragg gratings from equidistant holes [PDF]

open access: yes, 2011
We study nanofibers with Bragg gratings from equidistant holes. We calculate analytically and numerically the reflection and transmission coefficients for a single grating and also for a cavity formed by two gratings. We show that the reflection and transmission coefficients of the gratings substantially depend on the number of holes, the hole length ...
arxiv   +1 more source

Mask pattern transferred transient grating technique for molecular-dynamics study in solutions [PDF]

open access: yes, 2004
We have developed a mask pattern transferred transient grating (MPT-TG) technique by using metal grating films. Transient thermal grating is generated by an ultraviolet light pattern transfer to nitrobenzene in 2-propanol solution, and the subsequent ...
Okamoto, Koichi   +3 more
core   +1 more source

Casimir interaction between a sphere and a grating

open access: yes, 2015
We derive the explicit expression for the Casimir energy between a sphere and a 1D grating, in terms of the sphere and grating reflection matrices, and valid for arbitrary materials, sphere radius, and grating geometric parameters.
Antezza, Mauro   +3 more
core   +2 more sources

Extremely asymmetrical scattering of electromagnetic waves in gradually varying periodic arrays [PDF]

open access: yes, 1999
This paper analyses theoretically and numerically the effect of varying grating amplitude on the extremely asymmetrical scattering (EAS) of bulk and guided optical modes in non-uniform strip-like periodic Bragg arrays with stepwise and gradual variations
Gramotnev, D. K., Nieminen, T. A.
core   +2 more sources

Numerical modeling of frequency-selective surfaces perforated by U-shaped slots [PDF]

open access: yesРадиофизика и электроника, 2020
Subject and Purpose. Peculiarities of the electromagnetic wave scattering at screens perforated by U-shaped slots are the subject of the paper. Numerical modeling of frequency-selective surfaces with frequency characteristics given and research into the ...
L.P. Mospan   +3 more
doaj   +1 more source

Should particle trajectories comply with the transverse momentum distribution?

open access: yes, 2008
The momentum distributions associated with both the wave function of a particle behind a grating and the corresponding Bohmian trajectories are investigated and compared.
Arsenovic, D.   +4 more
core   +1 more source

Band-edge-induced Bragg diffraction in two-dimensional photonic crystals [PDF]

open access: yes, 2006
Two-dimensional photonic crystals composed of two orthogonal volume diffraction gratings have been photogenerated in photopolymers. When the read beam is set at the Bragg angle, the diffraction efficiency of the transmission grating is strongly enhanced ...
Chevallier, Raymond   +5 more
core   +2 more sources

Measurement of Wafer Focus by Grating Shearing Interferometry

open access: yesApplied Sciences, 2020
A method applied for improving the measurement precision and efficiency of wafer focusing in an optical lithography instrument (OLI) is introduced. Based on grating shearing interferometry, the defocus and tilt of the wafer are measured by testing the ...
Jian Wang, Song Hu, Xianchang Zhu
doaj   +1 more source

Diffractive Optics for Gravitational Wave Detectors [PDF]

open access: yes, 2006
All-reflective interferometry based on nano-structured diffraction gratings offers new possibilities for gravitational wave detection. We investigate an all-reflective Fabry-Perot interferometer concept in 2nd order Littrow mount.
A Bunkowski   +9 more
core   +3 more sources

Constructing Covalent Organic Polymers through Dative B─N Bonds: Synthesis, Single Crystal Structures, and Physical Properties

open access: yesAdvanced Functional Materials, EarlyView.
Dynamic linkages are highly attractive in preparing single crystals of covalent organic polymers (COPs). Here, single crystals of two COPs CityU‐15 and CityU‐16 based on reversible B─N bonds are constructed using tetra(4‐pyridyl)tetrathiafulvalene and tetra(4‐pyridyl)porphine as monomers.
Xin Wang   +7 more
wiley   +1 more source

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