Photo-induced ESR and optical absorption edge shift in amorphous Ge-S films

Shimizu, Tatsuo; Kumeda, Minoru; Watanabe, Ichirô; Nakagaki, Y.

doi:10.1016/0038-1098(78)90023-6

Cited by 33 publications

(3 citation statements)

References 8 publications

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“…12, which assumes inter‐molecular disordering 124. This group also performed comprehensive light‐induced ESR (LESR) studies for (Pb)GeS systems 125–127. Similar ESR studies on GeS glasses were performed also by Kumagai et al 128 in Osaka University.…”

Section: After 1980: Flourish and Relaxationmentioning

confidence: 88%

Chalcogenide glasses in Japan: A review on photoinduced phenomena

Tanaka

Shimakawa

2009

Physica Status Solidi (b)

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Section: After 1980: Flourish and Relaxationmentioning

confidence: 88%

Chalcogenide glasses in Japan: A review on photoinduced phenomena

Tanaka

Shimakawa

2009

Physica Status Solidi (b)

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“…Several models have been proposed to describe the mechanisms involved in the creation of dangling bonds under illumination with energy exceeding the band-gap energy, but this issue is still controversial 51,56 . Moreover, from the illumination of chalcogenide glasses under near-band-gap light (e.g., a Hg lamp), the evidence suggests that the observed band-gap shift is due to an increase in structural intermediate-range disorder (randomness) 48,57,58 . This structural randomness may broaden the resonance frequency band.…”

Section: Discussionmentioning

confidence: 99%

“…6. As a comparison, a band-gap shift of approximately 0.06 eV (dλ 1 ∼10 nm) was observed after illuminating a GeS 2.33 film for 4 h using a 400-W highpressure Hg lamp 48 . One may notice a surprising increase in the absorption in the full spectrum for the irradiated samples compared with that of the pristine samples (see the inset in Figs.…”

Section: High Refractive Index Contrast Allowing Compact Devicesmentioning

confidence: 99%

Nonlinear increase, invisibility, and sign inversion of a localized fs-laser-induced refractive index change in crystals and glasses

et al. 2020

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Multiphoton absorption via ultrafast laser focusing is the only technology that allows a three-dimensional structural modification of transparent materials. However, the magnitude of the refractive index change is rather limited, preventing the technology from being a tool of choice for the manufacture of compact photonic integrated circuits. We propose to address this issue by employing a femtosecond-laser-induced electronic band-gap shift (FLIBGS), which has an exponential impact on the refractive index change for propagating wavelengths approaching the material electronic resonance, as predicted by the Kramers-Kronig relations. Supported by theoretical calculations, based on a modified Sellmeier equation, the Tauc law, and waveguide bend loss calculations, we experimentally show that several applications could take advantage of this phenomenon. First, we demonstrate waveguide bends down to a submillimeter radius, which is of great interest for higher-density integration of fs-laser-written quantum and photonic circuits. We also demonstrate that the refractive index contrast can be switched from negative to positive, allowing direct waveguide inscription in crystals. Finally, the effect of the FLIBGS can compensate for the fs-laser-induced negative refractive index change, resulting in a zero refractive index change at specific wavelengths, paving the way for new invisibility applications.

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Creation of thermal spikes in the GeS11 glassy system by fast neutron irradiation

Lukášik

Macko

1981

Phys. Stat. Sol. (a)

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Chalcogenide glass GeS11, is irradiated by fast neutrons step by step within the range 1 × 1016 and 1 × 1019 neutrons cm−2. The creation of β and γ crystalline sulphur modifications in irradiated samples is interpreted as a consequence of so called thermal spikes, which are present in the small volume during interaction events. This is demonstrated by scanning electromicrographs. The evolution is shown of the sulphur crystalline modifications as a function of the neutron dose.

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Photo-induced ESR and optical absorption edge shift in amorphous Ge-S films

Cited by 33 publications

References 8 publications

Chalcogenide glasses in Japan: A review on photoinduced phenomena

Chalcogenide glasses in Japan: A review on photoinduced phenomena

Nonlinear increase, invisibility, and sign inversion of a localized fs-laser-induced refractive index change in crystals and glasses

Creation of thermal spikes in the GeS11 glassy system by fast neutron irradiation

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