Optical filters using coupled light waves in mixed crystals

Laurenti, J.P.; Rustagi, K. C.; Rouzeyre, M.

doi:10.1063/1.88700

Cited by 25 publications

(9 citation statements)

References 6 publications

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“…The consequences of mode coupling around the isotropic points (or at least around the lowest one) have been studied by various authors, both experimentally and theoretically [15][16][17][18][19][20][21][22][23][24][25][26]. The consequences of mode coupling around the isotropic points (or at least around the lowest one) have been studied by various authors, both experimentally and theoretically [15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: -Classical Transmission Problem Near the Isotropic Pointmentioning

confidence: 99%

Optical properties of Wurtzite-type semiconducting crystals near the isotropic point

Schillak

Czajkowski

1992

Nouv Cim D

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Using Stahrs coherent wave approach we calculated the linear interband susceptibility near the band gap. The starting point was the ,,MGM, formula with a smeared-out dipole density M(r) and the Green's function G for the effective-mass Hamiltonian with a screened Coulomb potential. The susceptibility so obtained was used for calculating transmission spectra of CdS platelets for energies near the so-called isotropic point lying far below the nearest excitonic resonance. By fitting experimental spectra we determined components of the residual dielectric tensor for polarization of the incident beam perpendicular and parallel to the c-axis, the mixed-mode dipole moment corresponding to B-exciton, and decay radii characterizing transition dipole densities. The established set of parameters determines the dielectric tensor for a quite wide energetic range.PACS 71.35 -Excitons and related phenomena (including electron-hole drops). PACS 71.36-Polaritons (including photon-phonon and photon-magnon interactions). PACS 78.20 -Optical properties of bulk materials.

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Section: -Classical Transmission Problem Near the Isotropic Pointmentioning

confidence: 99%

Optical properties of Wurtzite-type semiconducting crystals near the isotropic point

Schillak

Czajkowski

1992

Nouv Cim D

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“…It is enough to remind that the effects of energy transfer between the normal light waves in the vicinity of IP have stimulated elaboration of a canonical coupled-mode theory [11]. On the other hand, the IP-related effects have found numerous applications ranging from temperature or pressure measuring to constructing narrow-band optical filters and determining the exact content of a substance [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…This is a reason why mixed crystals with varying content or solid solutions with the IP have been studied so extensively (see, e.g., Refs. [9,12,15,[17][18][19][20]). On the other hand, efficient control of the IP characteristics anticipates also ascertaining the underlying interrelations between the structural and optical anisotropy characteristics.…”

Section: Introductionmentioning

confidence: 99%

Structure and optical anisotropy of K1.75(NH4)0.25SO4 solid solution

Shchepanskyi¹,

Kushnir²,

Stadnyk³

et al. 2017

Ukr. J. Phys. Opt.

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Abstract. In this work we have grown single crystals K x (NH 4 ) 2-x SO 4 (x  1.75), which belong to a potassium-ammonium sulfate family, and studied their roomtemperature structure. Spectral dependences of the principal refractive indices and principal optical birefringences are measured in the visible region. Anomalous birefringence dispersion is observed along the light propagation direction parallel to the principal x axis. According to our birefringence extrapolation based on the Sellmeier fit for the refractive indices, the symmetry of optical indicatrix at the room temperature should increase at the light wavelength λ IP  1350±60 nm. This corresponds to a specific 'isotropic point' defined by the condition n x (λ IP ) = n y (λ IP ), which has not been detected in either K 2 SO 4 or (NH 4 ) 2 SO 4 crystals.

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“…Nous pensions qu'il en serait de même pour la longueur d'onde isotrope Ai et que le couplage se produirait dans ces matériaux qui appartiennent tous à la classe 6 mm. C'est ce qu'ont pleinement confirmé nos premières expériences, [2] et [3], dont nous rappellerons l'essentiel dans la section 3, après une brève description de l'appareillage et des cristaux utilisés dans la section 2.…”

Section: Tome 12unclassified

Filtres optiques à couplage de modes polarisés

Laurenti

Vaigot

Rouzeyre

1977

Rev. Phys. Appl. (Paris)

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Nous décrivons le principe de fonctionnement de filtres optiques fonctionnant par transfert d'énergie entre deux modes électromagnétiques couplés polarisés à angle droit. Nous montrons que ce phénomène existe non seulement dans des matériaux à structure Wurtzite mais aussi dans des matériaux à structure zinc-blende. Ceci démontre que le couplage n'est pas spécifique à une classe cristalline et étend le domaine potentiel d'applications de l'ultra-violet, ∼ 1 000 Å, au proche infrarouge. Les matériaux à structure Wurtzite et à forte dispersion de biréfringence tels CdS, CdSxSe1- x et Zn1-xCdxS donnent des structures passe-bande ou coupe-bande extrêmement sélectives, Δλ ∼ 5 à 10 Å avec des taux de réjection hors-bande de l'ordre de 103. La fréquence d'accord est soit fixe soit continuement accordable depuis 4 300 Å jusqu'à 7 100 Å. Le facteur de transmission en bande passante atteint 80 % à 77 K mais est réduit à 20 % à 300 K par l'absorption résiduelle au voisinage du seuil d'absorption fondamentale. Dans les matériaux à structure zinc-blende, tel ZnTe, l'amplitude de la biréfringence induite par compression est faible ce qui donne une largeur de bande de l'ordre de 100 Å. Cette largeur de bande peut toutefois être modifiée entre quelque 20 et 150 Å en ajustant la valeur de la contrainte. A titre d'illustration nous terminons cet article par l'examen des performances limites d'une structure coupe-bande à CdS, dont le taux de réjection atteint 75 db, susceptible d'être utilisée dans une application du type spectroscopie Raman

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Optical filters using coupled light waves in mixed crystals

Abstract: Coupling of polarized optical waves in wurtzite II-VI mixed crystals is studied. It is shown that these crystals provide narrow-band optical filters over a wide spectral range.PACS numbers: 42.80.C, 78.20.D

Cited by 25 publications

References 6 publications

Optical properties of Wurtzite-type semiconducting crystals near the isotropic point

Optical properties of Wurtzite-type semiconducting crystals near the isotropic point

Structure and optical anisotropy of K1.75(NH4)0.25SO4 solid solution

Filtres optiques à couplage de modes polarisés

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