On the Polarization of Linear Electroabsorption Spectra Due to Impurities in Wurtzite Type Crystals

Boyn, R.

doi:10.1002/pssb.2220700258

Physica Status Solidi (b)

1975

DOI: 10.1002/pssb.2220700258

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On the Polarization of Linear Electroabsorption Spectra Due to Impurities in Wurtzite Type Crystals

R. Boyn

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Cited by 2 publications

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Jahn‐Teller Coupling Parameters from Stress‐Dichroism Spectra for CdS:Ti²⁺ and CdS:Co²⁺

Ruszczynski

Boyn

1976

Physica Status Solidi (b)

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Stress-induced dichroism spectra are measured for the mA2 + mT,(%' ) and -4 -4 mTl(mP) transitions of CdS:Ti2+ (m = 3) and CdS:Co2+ (m = 4), a t 80 K, for stress parallel and perpendicular to the hexagonal axis. The stress-induced changes of the first moments of the absorption bands are discussed on the basis of a tetrahedral cluster model. Coupling parameters to E-and 7,-type distortions are estimated, and comparable values are obtained for these two symmetries in all cases. The coupling behaviour of "corresponding" levels of the two impurity systems turns out to be rather similar. The data obtained are consistent with an earlier quantitative interpretation of the absorption band shapes for CdS:Ti2+. It is found that a point-ion model can give the correct sign of the coupling parameters, but leads to wrong results with respect to their (relative) magnitudes. Es werden Messungen des druckinduzierten Dichroismus im Bereich der mA2 -mTl(mF)-und -A2 + mTl(mP)-~berglinge von CdS:Ti2+ (m = 3) und CdS:Co2+ ( m = 4) bei 80 K fur Druck parallel und senkrecht zur hexagonalen Achse durchgefuhrt. Die druckinduzierten Anderungen der ersten Momente der Absorptionsbanden werden auf der Basis eines Tetraeder-Clustermodelk diskutiert. Kopplungsparameter fur E-und .c,-Deformationen werden bestimmt. Die 7,-Wechselwirkung erweist sich in allen FLllen als vergleichbar mit der E-Wechselwirkung. Das Kopplungsverhalten .,entsprechender" ZustLnde der beiden Storstellen ist recht ahnlich. Die erhaltenen Daten sind mit der fruheren quantitativen Interpretation der Bandenformen fur CdS: Ti2+ konsistent. Es zeigt sich, daB eine PunktionenRechnung das richtige Vorzeichen der Kopplungsparameter liefern kann, jedoch bezuglich der (Relativ-)Werte zu falschen Ergebnissen fuhrt.

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Jahn‐Teller Coupling Parameters from Stress‐Dichroism Spectra for CdS:Ti²⁺ and CdS:Co²⁺

Ruszczynski

Boyn

1976

Physica Status Solidi (b)

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First‐harmonic electromodulation in uniaxial crystals

Suisky¹,

Boyn²,

Enderlein³

et al. 1978

Physica Status Solidi (b)

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A discussion is given of an electromodulation mechanism which occurs in uniaxial crystals for electric fields perpendicular to the optical axis. Thismechanism is based on theelectro-opticalPockels effect, which produces a rotation of the polarization directions of the ordinary and extraordinary light waves propagating in the crystal. I n the presence of polarization-dependent zero-field transmission of the material, this leads to a change of transmission which is linear in the field. It is shown that this mechanism makes B significant contribution to the F J-c electromodulation spectra of transition metal centres in wurtzite-type CdS obtained recently, and that on this basis it is possible to understand the spectral shapes of the signals found in this geometry. An analogous mechanism should contribute to the electroreflection of uniaxial crystals.Es wird ein Elektromodulationsmechanismus diskutiert, der in einachsigen Kristallen bei elektrischen Feldern senkrecht zur optischen Achse auftritt. Dieser Mechanismus beruht auf dem elektro-optischen Pockels-Effekt, der eine Drehung der Polarisationsrichtungen der beiden sich im Kristall ansbreitenden Lichtwellen bewirkt. Bei polarisationsabhangiger Nullfeld-Transmission fuhrt dies zu einer im Feld linearen Transmissionsiinderg. Es wird gezeigt, daS dieser Mechanismu8 einen betrachtlichen Beitrag zu den kurzlich erhaltenen Elektromodulationsspektren ( F J-c) von ubergangsmetallzentren in CdS-Kristallen mit Wurtzit-Struktur liefert, und daS man auf dieser Basis die spektrale Form der in dieser Geometrie gefundenen Signale verstehen kann. Durch einen analogen Mechanismus wird die Reflexion einachsiger Kristalle beeinfluBt, d. h. es ist auch ein entsprechender Beitrag zu den Elektroreflexionsspektren derartiger Kristalle zu exwarten.

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On the Polarization of Linear Electroabsorption Spectra Due to Impurities in Wurtzite Type Crystals

Cited by 2 publications

References 4 publications

Jahn‐Teller Coupling Parameters from Stress‐Dichroism Spectra for CdS:Ti²⁺ and CdS:Co²⁺

Jahn‐Teller Coupling Parameters from Stress‐Dichroism Spectra for CdS:Ti²⁺ and CdS:Co²⁺

First‐harmonic electromodulation in uniaxial crystals

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On the Polarization of Linear Electroabsorption Spectra Due to Impurities in Wurtzite Type Crystals

Cited by 2 publications

References 4 publications

Jahn‐Teller Coupling Parameters from Stress‐Dichroism Spectra for CdS:Ti2+ and CdS:Co2+

Jahn‐Teller Coupling Parameters from Stress‐Dichroism Spectra for CdS:Ti2+ and CdS:Co2+

First‐harmonic electromodulation in uniaxial crystals

Contact Info

Product

Resources

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Jahn‐Teller Coupling Parameters from Stress‐Dichroism Spectra for CdS:Ti²⁺ and CdS:Co²⁺

Jahn‐Teller Coupling Parameters from Stress‐Dichroism Spectra for CdS:Ti²⁺ and CdS:Co²⁺