Journal•ISSN: 0022-3735
Journal of Physics E: Scientific Instruments
IOP Publishing
About: Journal of Physics E: Scientific Instruments is an academic journal. The journal publishes majorly in the area(s): Laser & Spectrometer. It has an ISSN identifier of 0022-3735. Over the lifetime, 6547 publications have been published receiving 73936 citations.
Topics: Laser, Spectrometer, Interferometry, Detector, Signal
Papers published on a yearly basis
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TL;DR: In this article, a rigorous expression for the transmission of a thin absorbing film on a transparent substrate is manipulated to yield formulae in closed form for the refractive index and absorption coefficient.
Abstract: The rigorous expression for the transmission of a thin absorbing film on a transparent substrate is manipulated to yield formulae in closed form for the refractive index and absorption coefficient. A procedure is presented to calculate the thickness to an accuracy of better than 1% with similar accuracies in the values of n. A method to correct for errors due to slit width is also given. Various formulae to calculate the absorption coefficient accurately over almost three orders of magnitude are discussed. Only data from the transmission spectrum are used and the procedure is simple, fast and very accurate. All formulae are in closed form and can be used on a programmable pocket calculator.
3,482 citations
TL;DR: In this paper, a new calculation following traditional methods is proposed for deducing optical constants and thickness from the fringe pattern of the transmission spectrum of a thin transparent dielectric film surrounded by nonabsorbing media.
Abstract: A new calculation following traditional methods is proposed for deducing optical constants and thickness from the fringe pattern of the transmission spectrum of a thin transparent dielectric film surrounded by non-absorbing media. The particular interest of this method, apart from its easiness, is that it makes a directly programmable calculation possible; the accuracy is of the same order as for the iteration method.
1,499 citations
TL;DR: In this paper, the surface contact electrodes are located in a closed loop or rosette array on one planar or nominally planar, skin surface of a body to be investigated, and electrically connected to data acquisition and processing equipment.
Abstract: In an APT method, the surface-contact electrodes are located in a closed loop or rosette array on one planar, or nominally planar, skin surface of a body to be investigated, and electrically connected to data acquisition and processing equipment. The invention also includes apparatus for carrying out this method, comprising an array of surface-contact electrodes (8), adapted to be applied to the skin of a body to be investigated, the electrodes (8) being arranged on a flexible carrier (10) in a closed loop, or rosette formation on one common plane, or nominal plane.
735 citations
TL;DR: In this paper, the effects of thickness variation, surface roughness and variation in refractive index on the transmission spectrum of thin thin films were analyzed and analytical expressions were derived from which all the optical constants of an inhomogeneous film can be calculated from the optical transmission spectrum.
Abstract: Inhomogeneities in thin films have a large influence on the optical transmission spectrum. If not corrected for, this may lead to too large calculated values for the absorption coefficient or the apparent presence of an absorption band tail as well as serious errors in the values of refractive index and thickness. The effects of thickness variation, surface roughness and variation in refractive index on the transmission spectrum are analysed. Analytical expressions are derived from which all the optical constants of an inhomogeneous film can be calculated from the transmission spectrum.
644 citations
TL;DR: In this paper, an electron-optical device has been constructed in which electrons originally emitted over 2 pi steradians from a region of small volume are formed into a beam of half-angle 2 degrees.
Abstract: An electron-optical device has been constructed in which electrons originally emitted over 2 pi steradians from a region of small volume are formed into a beam of half-angle 2 degrees . The instrument makes use of a magnetic field that diverges from 1 to 10-3 Tesla. The energies of the electrons parallelised in this way have been measured with a time-of-flight technique, giving energy resolutions as low as 15 meV. Electrons of energy 0-3 eV, formed in multiphoton ionisation, were used for these tests. The device can also act as an electron-image magnifier, giving a spatial resolution of a few mu m in the source plane. Detailed theoretical and computational results on the properties of the new apparatus are given.
579 citations