Electro-transmission spectra of Li doped NiO and MnO in the visible and near infrared — A new optical effect in 3d semiconductors

Austin, I. G.; Gamble, Rick D.; Koffyberg, F. P.

doi:10.1016/0038-1098(72)90897-6

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1974

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“…(Note that in this case the direction of L differs from p.) This latter result means that in eqs. (10) and (13) [not in (9)] we must put 01 = 02. Therefore, we have to conclude that owing to this fact and to the trigonal symmetry all possible contributions to Aav cancel, or, in other words, the aluminium centre cannot be held responsible for the electromodulation of the absorption.…”

Section: the Energy Differencementioning

confidence: 99%

Electromodulated absorption in smoky quartz

Brom

Volger

1974

Physica

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The optical absorption coefficient of "smoky" quartz (containing aluminium) can be modulated by applying an electric field. The effect saturates at high fields and low temperatures and reaches a maximum at 535 nm. The results are discussed in terms of a model consisting of a colour centre, dipolar in character and exhibiting anisotropic absorption. Realignment of the dipoles induces changes in the observed absorption. The experiments suggest that the centre is an XO4 complex with a hole trapped at one of the oxygens, and that X is an ion substituted for a Si 4÷ ion. X cannot be identified with the well-known aluminium impurity; it is tentatively proposed to be an iron ion (as in amethyst).

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Section: the Energy Differencementioning

confidence: 99%