Electron beam induced luminescence of SiO&lt;inf&gt;2&lt;/inf&gt; optical coatings

Dennison, John; Evans, Amberly; Wilson, Gregory; Dekany, Justin; Bowers, Charles W.; Meloy, Robert

doi:10.1109/ceidp.2012.6378824

Cited by 9 publications

(30 citation statements)

References 12 publications

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“…4 14 . The observed luminescence occurs when an incident high energy, charged particle undergoes a series of inelastic collisions exciting valence band electrons into the conduction band.…”

Section: Resultsmentioning

confidence: 97%

“…4 were obtained with the overall intensity, , and as free parameters; only the overall intensity varied from one experiment to the next. A more detailed discussion of the model is given by Dennison et al 14 . Here we only summarize the dependence of spectral radiance on , , , and : Incident Beam Current.…”

Section: Resultsmentioning

confidence: 99%

“…Details of the experimental set up, electron sources and beam characterization, optical detectors, methods, calibration, and the sample mounting carousel and thermal stage, are given by Dennison et al 15 . Additional details of the thermal dependence of the cathodoluminescence are presented by Jensen et al 14 . Electron transport, surface voltage data, and electrostatic discharge measurements acquired simultaneously with luminescence data are reported by Wilson et al 11 .…”

Section: Experimentationmentioning

confidence: 98%

“…For nonpenetrating radiation-where the energy-dependent penetration depth or range, ( ), is less than the film thickness L-all incident power is absorbed in the coating and and are linearly proportional to the incident power density, ( ⁄ ). For penetrating radiationwhere ( ) > -the absorbed power is reduced by a factor of / ( ) 14 . At energies up to ~1.5 keV needed to penetrate a ~65 nm SiO 2 coating, is linearly proportional to incident flux, energy and power.…”

Section: Incident Beam Energymentioning

confidence: 99%

“…(2) to account for quasielastic backscattered electrons that do not deposit substantial energy; ( ) is the backscattered electron yield 14 .…”

Section: Incident Beam Energymentioning

confidence: 99%

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Properties of cathodoluminescence for cryogenic applications of SiO₂-based space observatory optics and coatings

et al. 2013

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Disordered thin film SiO 2 /SiO x coatings undergoing electron-beam bombardment exhibit cathodoluminescence, which can produce deleterious stray background light in cryogenic space-based astronomical observatories exposed to highenergy electron fluxes from space plasmas. As future observatory missions push the envelope into more extreme environments and more complex and sensitive detection, a fundamental understanding of the dependencies of this cathodoluminescence becomes critical to meet performance objectives of these advanced space-based observatories. Measurements of absolute radiance and emission spectra as functions of incident electron energy, flux, and power typical of space environments are presented for thin (~60-200 nm) SiO 2 /SiO x optical coatings on reflective metal substrates over a range of sample temperatures (~40-400 K) and emission wavelengths (~260-5000 nm). Luminescent intensity and peak wavelengths of four distinct bands were observed in UV/VIS/NIR emission spectra, ranging from 300 nm to 1000 nm. A simple model is proposed that describes the dependence of cathodoluminescence on irradiation time, incident flux and energy, sample thickness, and temperature.

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“…4 14 . The observed luminescence occurs when an incident high energy, charged particle undergoes a series of inelastic collisions exciting valence band electrons into the conduction band.…”

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Experimentationmentioning

confidence: 98%

Section: Incident Beam Energymentioning

confidence: 99%

“…(2) to account for quasielastic backscattered electrons that do not deposit substantial energy; ( ) is the backscattered electron yield 14 .…”

Section: Incident Beam Energymentioning

confidence: 99%

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Properties of cathodoluminescence for cryogenic applications of SiO₂-based space observatory optics and coatings

et al. 2013

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Nanodielectric properties of high conductivity carbon-loaded polyimide under electron-beam irradiation

Jensen

Dennison

Dekany

et al. 2013

2013 IEEE International Conference on Solid Dielectrics (ICSD)

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Electron irradiation experiments were conducted to investigate the electron transport, charging, discharging, cathodoluminescence and emission properties of highconductivity carbon-loaded polyimide (Black Kapton TM ). We discuss how these results are related to the nanoscale structure of the composite material. Measurements were conducted in an ultrahigh vacuum electron emission test chamber from <40 K to 290 K, using a monoenergetic beam with energies ranging from 3 keV to 25 keV and flux densities from 0.1 nA/cm 2 to 100 nA/cm 2 to deposit electrons in the material surface layer. Various experiments measured transport and displacement currents to a rear grounded electrode, absolute electron emission yields, electron-induced absolute photon emission yields and photon emission spectra (~250 nm to 1700 nm), and arcing rates and location. Numerous arcing events from the material edge to an electrically isolated grounded sample holder (particularly at lower temperatures) were observed, which are indicative of charge accumulation within the insulating regions of the material. Three types of light emission were also observed: (i) short duration (<1 s) arcing resulting from electrostatic discharge, (ii) long duration cathodoluminescence that turned on and off with the electron beam and (iii) intermediate duration (~100 s) glow that dissipated exponentially with time after infrequent and rapid onset. We discuss how the electron currents and arcing, as well as light emission absolute intensity and frequency, depend on electron beam energy, power, flux and temperature.

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Ultrahigh Vacuum Cryostat System for Extended Low-Temperature Space Environment Testing

Dekany

Johnson

Wilson

et al. 2014

IEEE Trans. Plasma Sci.

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The range of temperature measurements have been significantly extended for an existing space environment simulation test chamber used in the study of electron emission, sample charging and discharge, electrostatic discharge and arcing, electron transport, and luminescence of spacecraft materials. This was accomplished by incorporating a new twostage, closed-cycle helium cryostat which has an extended sample temperature range from <40 K to >450 K, with long-term controlled stability of <0.5 K. The system was designed to maintain compatibility with an existing ultrahigh vacuum chamber (base pressure <10-7 Pa) that can simulate diverse space environments. These existing capabilities include controllable vacuum and ambient neutral gases conditions (<10-8 to 10-1 Pa), electron fluxes (5 eV to 30 keV monoenergetic, focused, pulsed sources over 10-4 to 10 10 nA-cm-2), ion fluxes (<0.1 to 5 keV monoenergetic sources for inert and reactive gases with pulsing capabilities), and photon irradiation (numerous continuous and pulsed monochromated and broad band IR/VIS/UV [0.5 to 7 eV] sources). The new sample mount accommodates 1 to 4 samples of 1 cm to 2.5 cm diameter in a low temperature carousel, which allows rapid sample exchange and controlled exposure of the individual samples. Custom hemispherical grid retarding field analyzer and Faraday cup detectors, custom high speed, high sensitivity electronics, and charge neutralization capabilities used with <50 pA, <5 μs, <3·10 3 electrons/pulse pulsed-beam sources permit high-accuracy electron emission measurements of extreme insulators with minimal charging effects. In situ monitoring of surface voltage, arcing, and luminescence (250 nm to 5000 nm) have recently been added.

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Electron beam induced luminescence of SiO<inf>2</inf> optical coatings

Cited by 9 publications

References 12 publications

Properties of cathodoluminescence for cryogenic applications of SiO₂-based space observatory optics and coatings

Properties of cathodoluminescence for cryogenic applications of SiO₂-based space observatory optics and coatings

Nanodielectric properties of high conductivity carbon-loaded polyimide under electron-beam irradiation

Ultrahigh Vacuum Cryostat System for Extended Low-Temperature Space Environment Testing

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Electron beam induced luminescence of SiO<inf>2</inf> optical coatings

Cited by 9 publications

References 12 publications

Properties of cathodoluminescence for cryogenic applications of SiO2-based space observatory optics and coatings

Properties of cathodoluminescence for cryogenic applications of SiO2-based space observatory optics and coatings

Nanodielectric properties of high conductivity carbon-loaded polyimide under electron-beam irradiation

Ultrahigh Vacuum Cryostat System for Extended Low-Temperature Space Environment Testing

Contact Info

Product

Resources

About

Properties of cathodoluminescence for cryogenic applications of SiO₂-based space observatory optics and coatings

Properties of cathodoluminescence for cryogenic applications of SiO₂-based space observatory optics and coatings