Filters
Results 1 - 10 of 11724
Results 1 - 10 of 11724.
Search took: 0.05 seconds
Sort by: date | relevance |
AbstractAbstract
[en] The propagation of space-charge waves through a coaxial waveguide containing an annular plasma in an axial magnetic field is investigated. Both plasma and cyclotron types of waves are analyzed in the electrostatic approximation. Equations for the determination of the dispersion relations are derived from the Poisson equation and the electron continuity and momentum transfer equations. A numerical study of the dispersion curves for azimuthally symmetrical waves is presented. A significant departure from the dispersion characteristics of a cylindrical plasma waveguide are found to occur unless the inner radius of the waveguide is small compared to the outer radius. copyright 1998 American Institute of Physics
Primary Subject
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Gao Yu; Liu Fengqi; Liu Junqi; Li Lu; Wang Lijun; Wang Zhanguo, E-mail: fqliu@semi.ac.cn2010
AbstractAbstract
[en] The tapered quantum cascade lasers operating at about 9.0 μm are reported. In contrast to the common ridge waveguide laser, tapered devices give rather small horizontal beam divergence. Performances of devices with identical 11 μm ridge waveguide sections and different tapered gain sections are comparatively studied. The optimal taper angle of 3o leads to a relative high output power and a very small horizontal beam divergence of 7.1o. (semiconductor integrated circuits)
Primary Subject
Source
Available from http://dx.doi.org/10.1088/1674-4926/31/3/034008; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Journal of Semiconductors; ISSN 1674-4926;
; v. 31(3); [4 p.]

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Ono, M.; Stix, T.H.; Wong, K.L.; Horton, R.
Plasma physics and controlled nuclear fusion research 19801981
Plasma physics and controlled nuclear fusion research 19801981
AbstractAbstract
[en] A reactor-heating concept utilizing a wave-guide-launched ion-Bernstein wave in the ion-cyclotron range of frequencies is presented. Details of wave-launching transformation, propagation and absorption, together with low-power experimental results from the ACT-1 toroidal device, are summarized. (author)
Primary Subject
Source
International Atomic Energy Agency, Vienna (Austria); Nucl. Fusion; Suppl. 1981; 857 p; ISBN 92-0-130181-2;
; 1981; v. 2 p. 501-503; IAEA; Vienna; 8. international conference on plasma physics and controlled nuclear fusion research; Brussels, Belgium; 1 - 10 Jul 1980; IAEA-CN--38/T-1-2(B)

Record Type
Book
Literature Type
Conference
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
No abstract available
Primary Subject
Source
5. particle accelerator conference; San Francisco, California, USA; 5 Mar 1973; See CONF-730310--.
Record Type
Journal Article
Literature Type
Conference
Journal
IEEE (Inst. Elec. Electron. Eng.), Trans. Nucl. Sci; v. NS-20(3); p. 960-962
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] A theoretical study of parametric amplification in magnetoinductive waveguides comprising metamaterial elements is presented. It is shown that phase-matching conditions can be satisfied in coupled waveguides by tailoring the dispersion characteristic of magnetoinductive waves. The corresponding formulation for parametric amplification is developed ab initio and analysed for a number of special cases. The problem of loss compensation in metamaterials by means of parametric amplification of magnetoinductive waves is studied in more detail
Primary Subject
Source
S0022-3727(07)58410-X; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] A possibility of transferring of light energy between coupled plasmon waveguide channels is considered. These channels are formed on the basis of a metal-dielectric-metal structure in which the dielectric gap has two closely located minima along the thickness. Dependences of the light energy pumping speed on the minimum gap thickness and distance between channels are found
Primary Subject
Source
Available from National Academy of Sciences of Armenia; 25 refs., 3 figs.
Record Type
Journal Article
Journal
Izvestiya National'noj Akademii Nauk Armenii. Fizika; ISSN 1025-5613;
; CODEN IAAFF8; v. 46(3); p. 165-171

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] Silk fibroin is an abundant natural polymer, which in the last years has been proposed as an attractive material for high-technological applications, offering also new opportunities for photonics and optoelectronics. In this context, the design of optical waveguides based on silk fibroin is of great interest because of their ability to direct light in a controlled manner. In this work, we demonstrate the use of femtosecond direct laser writing (fs-DLW) to fabricate silk fibroin waveguides. Such waveguides were characterized by coupling 632.8 nm light from a He–Ne laser. Our findings demonstrate the potential of fs-DLW as a novel approach for the fabrication of silk fibroin waveguides, which provides a versatile platform for optical and biomedical applications.
Primary Subject
Source
8. International Conference on Optical, Optoelectronic and Photonic Materials and Applications; Maresias (Brazil); 26-31 Aug 2018; Copyright (c) 2019 Springer Science+Business Media, LLC, part of Springer Nature; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Literature Type
Conference
Journal
Journal of Materials Science. Materials in Electronics; ISSN 0957-4522;
; CODEN JSMEEV; v. 30(18); p. 16843-16848

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Tikeng-Manfouo, Arnaud D; Kofane, T C; Fotsa-Ngaffo, Fernande, E-mail: arnaudtikeng@yahoo.fr2021
AbstractAbstract
[en] A pseudo-Hermitian (PH) system made up of three coupled waveguides (trimer) with an overall balanced gain and loss is investigated in a parity time (PT)-symmetric-like regime. Remarkably, the pseudo hermiticity parameter controls the asymmetric spatial field modulation between left and right propagating waves whereby, a complex coupling arises that induces an additional source of non-Hermiticity, which in the system acts as a relative gain/loss Hellmann-Feynman correction. In this situation, we show that, transmissionless backscatterings are observed for the PH-trimer in the non PT broken phase. Interestingly, the scattering properties of PH-trimer result in multiple lasing states with different mechanisms. In particular, we show that in the PT-symmetric case, the lasing modes associated to the coherent perfect-absorption (CPA), occur from the spectral singularity induced by the Hermitian chain coupling and give rise to unidirectional invisibility in the direction of incident wave. On the contrary, additional emerging lasing modes in a PH regime result from the scattering maxima resonance. We demonstrate that this specific cases suppress the CPA-laser phenomenon and rather exhibit exceptional points characterized by reflectionless but also the points of transmissionless. Numerical beam propagations realized to emphasize the results are in good agreement with the scattering investigation until gain/loss parameter is around it’s value giving resonance. (paper)
Primary Subject
Source
Available from http://dx.doi.org/10.1088/1402-4896/abede1; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Physica Scripta (Online); ISSN 1402-4896;
; v. 96(6); [15 p.]

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] GaAs/AlGaAs quantum-wire (QWR) gain-coupled distributed-feedback (GC-DFB) lasers were fabricated and characterized. Interestingly, as the shape of the active grating was varied, the lasing characteristics changed greatly; for example, one laser with sharp gratings lased at a threshold current of 13 mA while another one with dull gratings lased at 230 mA. This may be due to a change in the gain coupling coefficient with the shape of the QWR active grating. Little observation of the stopband and the wavelength consistency between the lasing and the photoluminescence peaks of the QWRs also provided evidence for lasing via GC-DFB effects in these devices
Primary Subject
Secondary Subject
Source
8 refs, 4 figs
Record Type
Journal Article
Journal
Journal of the Korean Physical Society; ISSN 0374-4884;
; v. 42(6); p. 791-794

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] Highlights: • The fluorescent microwires of ADPI were prepared by a facile solution process. • These microwires displayed the excellent waveguide and polarization performance. • The ADPI molecules in the microwires are the uniaxially oriented packing. The well-defined single-crystalline microwires of a solid-emissive organic functional molecule, 2-(anthracen-9-yl)-4, 5-diphenyl-1H-imidozole (ADPI) were successfully prepared by a facile solution process without the use of surfactant or additional templates. In addition, the optical loss coefficient is as low as 0.1 dB μm−1 for the as-prepared ADPI microwires, which is lower than most previous reported organic optical waveguides. Meanwhile, these microwires also show optically uniaxial properties as demonstrated by the linearly polarized emission, providing potentially orientation-sensitive applications as optical waveguides with low optical loss.
Primary Subject
Secondary Subject
Source
S0009261416301646; Available from http://dx.doi.org/10.1016/j.cplett.2016.03.048; Copyright (c) 2016 Elsevier B.V. All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
1 | 2 | 3 | Next |