Characterisation of spectroscopic and magneto-optical faraday rotation in Mn2+- doped CdS quantum dots in a silicate glass

Panmand, Rajendra P.; Tekale, Shashikant P.; Daware, Krishna D.; Gosavi, Suresh; Jha, A.; Kale, Bharat B.

doi:10.1016/j.jallcom.2019.152696

Cited by 20 publications

(17 citation statements)

References 38 publications

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“…Therefore, when V paramag is higher than V diamag , the MO glass is predominantly paramagnetic. As discussed before, a useful way to increase the V paramag component in a MO glass is by adding paramagnetic species such as Tb 3+ , Dy 3+ , or Mn 2+ ions 1 , 7 , 46 . The proportional inverse relationship between V paramag and wavelength can be expressed as shown in Eq.…”

Section: Resultsmentioning

confidence: 99%

Magneto-optical borogermanate glasses and fibers containing Tb3+

Franco

Ledemi

Correr

et al. 2021

Sci Rep

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New glass compositions containing high concentrations of Tb3+ ions were developed aiming at the production of magneto-optical (MO) fibers. This work reports on the structural and MO properties of a new glass composition based on (100 − x)(41GeO2–25B2O3–4Al2O3–10Na2O–20BaO) − xTb4O7. Morphological analysis (HR-TEM) of the sample with the highest concentration of Tb3+ ions confirmed the homogeneous distribution of Tb3+ ions and the absence of nanoclusters. All the samples presented excellent thermal stability against crystallization (ΔT > 100 °C). An optical fiber was manufactured by a fiber drawing process. The UV–Vis spectra of the glasses showed Tb3+ electronic transitions and optical windows varying from 0.4 to 1.6 μm. The magneto-optical properties and the paramagnetic behaviors of the glasses were investigated using Faraday rotation experiments. The Verdet constant (VB) values were calculated at 500, 650, 880, 1050, 1330, and 1550 nm. The maximum VB values obtained at 650 and 1550 nm for the glass with x = 18 mol% were -128 and − 17.6 rad T−1 m−1, respectively. The VB values at 500 and 1550 nm for the optical fiber containing 8 mol% of Tb4O7 were − 110.2 and − 9.5 rad T−1 m−1, respectively, while the optical loss at around 880 nm was 6.4 dB m−1.

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Section: Resultsmentioning

confidence: 99%

Magneto-optical borogermanate glasses and fibers containing Tb3+

Franco

Ledemi

Correr

et al. 2021

Sci Rep

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show abstract

“…glass is by adding paramagnetic species such as Tb 3+ , Dy 3+ , or Mn 2+ ions 1,7,47 . The proportional inverse relationship between Vparamag and wavelength can be expressed as shown in Equation (4) 13:…”

Section: Sample Label Tgmentioning

confidence: 99%

“…Therefore, when Vparamag is higher than Vdiamag, the MO glass is predominantly paramagnetic. As discussed before, a useful way to increase the Vparamag component in a MO glass is by adding paramagnetic species such as Tb 3+ , Dy 3+ , or Mn 2+ ions 1,7,47 . The proportional inverse relationship between Vparamag and wavelength can be expressed as shown in Equation (4) 13 :…”

Section: Magneto-optical Properties and Verdet Constant (V B )mentioning

confidence: 99%

Large Faraday effect and structural properties of heavily Tb3+-doped borogermanate glasses: a potential precursor of magneto-optical fibers

Franco

Ledemi

Correr

et al. 2021

Preprint

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New glass compositions containing high concentrations of Tb3+ ions were developed aiming at the production of magneto-optical (MO) fibers. This work reports on the structural and MO properties of a new glass composition based on (100-x)(41GeO2-25B2O3-4Al2O3-10Na2O-20BaO) – xTb4O7. Morphological analysis (HR-TEM) of the sample with the highest concentration of Tb3+ ions confirmed the homogeneous distribution of Tb3+ ions and the absence of nanoclusters. All the samples presented excellent thermal stability against crystallization (ΔT > 100 oC). An optical fiber was manufactured by a fiber drawing process. The UV-Vis spectra of the glasses showed Tb3+ electronic transitions and optical windows varying from 0.4 to 1.6 µm. The magneto-optical properties and the paramagnetic behaviors of the glasses were investigated using Faraday rotation experiments. The Verdet constant (VB) values were calculated at 500, 650, 880, 1050, 1330, and 1550 nm. The maximum VB values obtained at 650 and 1550 nm for the glass with x = 18 mol% were − 128 and − 17.6 rad T− 1 m− 1, respectively. The VB values at 500 and 1550 nm for the optical fiber containing 8 mol% of Tb4O7 were − 110.2 and − 9.5 rad T− 1 m− 1, respectively, while the optical loss at around 880 nm was 6.4 dB m− 1.

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“…Moreover, these effects can be widely tuned by an external magnetic field, temperature, and the concentration of magnetic ions to induce fascinating magneto-optical (MO) and magneto-electrical properties. Among all the exciting signatures of such exchange interaction, the striking consequences are the giant Zeeman splitting (GZS) [7][8][9] and the giant Faraday rotation (GFR) [10,11]. The Zeeman splitting between the band states with different spin components generates the spin -polarization of the conducting carriers, which is exploited as spin aligners in spintronic devices [12,13], an anomalous magnetoresistance at low temperature [14], and vastly amplifies the conversion of the spin current into an electrical current [15].…”

Section: Introductionmentioning

confidence: 99%

Giant excitonic magneto-optical Faraday rotation in single semimagnetic CdTe/Cd_{1-x}Mn_{x}Te quantum ring

Panneerselvam¹,

Muralidharan²

2023

Preprint

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Magnetic tuning of the bound exciton states and corresponding giant Zeeman splitting (GZS) between σ + and σ − excitonic transitions in CdTe/Cd1−xMnxTe quantum ring has been investigated in the Faraday configuration for various concentrations of Mn 2+ ions, using the variational technique in the effective mass approximation. The sp-d exchange interaction between the localized magnetic impurity ions and the delocalized charge carriers has been accounted via mean-field theory with the inclusion of a modified Brillouin function. The enhancement of the GZS, and in turn, the effective g-factor with the application of an external magnetic field, is strikingly manifested in type-I -type-II transition in the band structure, which has been well explained by computing the overlap integral between the electron and hole, and the in-plane exciton radius. This highlights the extraordinary magneto-optical properties, including the giant Faraday rotation and associated Verdet constant, which have been calculated using single oscillator model. The oscillator strength and exciton lifetime have been estimated, and are found to be larger than in the bulk diluted magnetic semiconductors (DMS) and quantum wells, reflecting stronger confinement inside the quantum ring. The results show that the DMS-based quantum ring exhibits more extensive Zeeman splitting, which gives rise to ultra-high Verdet constant of 2.6 × 10 9 rad/Tesla/m, which are a few orders of magnitude larger than in the existing quantum systems and magneto-optical materials.

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Characterisation of spectroscopic and magneto-optical faraday rotation in Mn2+- doped CdS quantum dots in a silicate glass

Abstract: This is a repository copy of Characterisation of spectroscopic and magneto-optical faraday rotation in Mn2+-doped CdS quantum dots in a silicate glass.

Cited by 20 publications

References 38 publications

Magneto-optical borogermanate glasses and fibers containing Tb3+

Magneto-optical borogermanate glasses and fibers containing Tb3+

Large Faraday effect and structural properties of heavily Tb3+-doped borogermanate glasses: a potential precursor of magneto-optical fibers

Giant excitonic magneto-optical Faraday rotation in single semimagnetic CdTe/Cd_{1-x}Mn_{x}Te quantum ring

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