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Digitale Medien

Microstructurally engineered, optically transmissive, electrically conductive metal films (1986)

Aspnes, D. E. ; Heller, A. ; Porter, J. D.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 60 (1986), S. 3028-3034

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Using standard multilayer and effective medium models, we determine microstructures that optimize the near-IR-visible normal-incidence optical transmittance of electrically conducting metal films intended for use as semitransparent contacts for semiconductor devices such as photodetectors or photoelectrochemical converters. Various conditions are considered, including unpolarized and linearly polarized light and electrical conduction both parallel and perpendicular to the surface. For linearly polarized light, the optimum microstructure consists of parallel metal lines of nominally square cross section oriented perpendicular to the polarization vector of the incident light, regardless of the direction of electrical conduction. The line separation and cross-sectional dimensions must both be small compared to the wavelength λ. For unpolarized radiation, the optimum microstructure depends on the direction of electrical conduction. For conduction parallel to the surface, the optimum microstructure again consists of parallel lines with the lines oriented perpendicular to the residual linear polarization, if any, of the incident flux. For conduction perpendicular to the surface, the optimum microstructure consists of cylindrical metal posts of dimension small compared to λ. Expressions are derived that allow the thicknesses and refractive indices of protective antireflection coatings to be calculated to first order in the thicknesses of the metal films. The more general case of antireflection coatings for anisotropic structures is briefly discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.337757

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Digitale Medien

The spectrum of highly ionized praseodymium and dysprosium from the Texas tokamak plasma in the 50–250-A(ring) range (1986)

Finkenthal, M. ; Lippmann, A. S. ; Huang, L. K. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 59 (1986), S. 3644-3649

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Spectra of highly ionized praseodymium and dysprosium recorded from the Texas tokamak (TEXT) plasma have been analyzed in the 50–250-A(ring) range. The spectra contain high-intensity continuum bands in the region below 100 A(ring) and bright individual lines above this wavelength. Lines of highly ionized praseodymium and dysprosium have been identified. The highest ionization state reached in the 1-keV central electron temperature tokamak plasma was Cu i-like Pr xxxi. The composition of the bands is explained in terms of a new theoretical approach developed to treat large unresolved transition arrays. The brightness of the continuum is compared with that of intense spectral lines emitted in the same wavelength range.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.336744

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Digitale Medien

New imaging bandpass electron energy analyzer (1986)

Turner, D. W. ; Plummer, I. R. ; Porter, H. Q.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 57 (1986), S. 1494-1500

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: An electron energy analyzer which acts as a bandpass filter while maintaining the spatial integrity of an electron image in a uniform magnetic field is described. It embodies some new electron-optical properties. Image electrons injected parallel to the magnetic field are guided, using crossed electrostatic and magnetic fields, to a low-pass electron mirror and then through a high-pass retardation filter. Nonuniform electrostatic deflection fields are used to compensate for the energy-dependent dispersion of the crossed fields. A simple computer modeling method used to design the electrostatic fields is described. A test analyzer was constructed to operate in a 0.0125-T (125 G) uniform magnetic field to investigate its properties. Bandpass filtered images of an 18-eV electron source demonstrating the removal of energy-dependent dispersion and the narrowing of the bandwidth to 100 meV are presented. Another application of the analyzer, to obtain an energy spectrum from a spatially extended electron source, is demonstrated.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1138574

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