Electro-Optical Properties of Liquid Crystals Composite with Zinc Oxide Nanoparticles

Eskalen, Hasan; Özğan, Şükrü; Alver, Ümit; Kerli, Süleyman

doi:10.12693/aphyspola.127.756

Cited by 67 publications

(28 citation statements)

References 29 publications

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“…Doping common oxide crystals to alter their optical properties is a widely known and welldeveloped industrial technique [19,20]. Here, we look at other works that have independently measured the effect of Cr doping in MgO on the optical properties.…”

Section: Doping Impact On the Yield Of Shgmentioning

confidence: 99%

Controlling the non-linear optical properties of MgO by tailoring the electronic structure

et al. 2020

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The study of the non-linear response of matter to high electric fields has recently encompassed harmonic generation in solids at near-infrared (NIR) driving wavelengths. Interest has been driven by the prospect of ultrafast signal processing and all-optical mapping of electron wavefunctions in solids. Engineering solid-state band structures to control the non-linear process has already been highlighted theoretically. Here, we show experimentally for the first time that second harmonic generation (SHG) can be enhanced by doping crystals of magnesium oxide (MgO) with chromium (Cr) atoms. We show that the degree of enhancement depends nonlinearly on dopant concentration. The SHG efficiency is shown to increase when Cr dopants are introduced into pure MgO. A physical picture of the effect of Cr dopants is aided by density functional theory (DFT) calculations of the electronic structure for pure and doped samples. This work shows an unambiguous enhancement of the SHG efficiency by modifying the electronic structure. The observed effects are consistent with an electronic structure that facilitates the surface induced SHG and demonstrates a minimal angular dependence. This work highlights the potential of manipulating the electronic structure of solids to control or test theories of their non-linear optical response.

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Section: Doping Impact On the Yield Of Shgmentioning

confidence: 99%

Controlling the non-linear optical properties of MgO by tailoring the electronic structure

et al. 2020

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“…Alternatively, Fig.2.b shows the biasing states of NLC layer, where the molecules align along x-axis and φ equals 90 ○ . Commonly, the applied field is driven by a square wave with amplitude normally varying from 0 volt up to 40 volt and frequency varying from 50 Hz up to 1 kHz [20]. As the amplitude of the applied signal increases further, the more alignment is induced on the NLC molecular director.…”

Section: Proposed Two-bit Binary Storage Structurementioning

confidence: 99%

“…A strong field can realign an NLC rather quickly, within 100 ns [15]. Further, doping the NLC layer by isotropic layers such as zinc oxide nano-particles [20] can be useful for reducing the amplitude of the required voltage. NLCs have received lots of interest in the last decades and have been applied in different nano-photonic applications such as optical routers [19], image encryption [21], photonic crystal fibers [22][23] and distributed feedback lasers [24].…”

Section: Proposed Two-bit Binary Storage Structurementioning

confidence: 99%

Novel Plasmonic Data Storage Based on Nematic Liquid Crystal Layers

Elrabiaey

Areed

Obayya

2016

J. Lightwave Technol.

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“…There are many distinguished researchers investigating liquid crystals, and some of whose works are focused on doping nanomaterials into liquid crystals [23][24][25][26][27][28][29]. Gold, silver, zinc oxide, carbon, and quantum dots nanoparticles are some of the examples of guest nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermally Produced Cobalt Oxide Nanostructures at Different Temperatures and Effect on Phase Transition Temperature and Threshold Voltage of Nematic Liquid Crystal Host

Eskalen¹,

Kerli²,

Özğan³

2017

Cobalt

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In this study, cobalt oxide Co 3 O 4 nanostructured material is synthesized by hydrothermal method by using different concentration of cobalt acetate salt at unique hydrothermal reaction time for five different hydrothermal reaction temperatures 105, 120, 140, 160, and 180 C. The obtained nanoparticles are annealed at 300 C for 5 h. Co 3 O 4 nanostructures are determined by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV-vis spectroscopy. The hydrothermally produced samples were reannealed at 550 C, and morphological and structural properties were investigated deeply again. The effect of annealing temperature on morphologies and crystalline structure of cobalt oxide nanoparticle (NP) was also investigated. Nanopyramids and nanorods are two main morphologically obtained structures from the hydrothermal experiment. Nematic liquid crystal mixture E7 is doped with Co 3 O 4 nanorod. Phase transition and threshold voltage of pure and Co 3 O 4 NP-doped E7 LC are examined successfully. It reveals that for Co 3 O 4 NP-doped E7 phase transition temperature and threshold voltage increased very slightly.

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Electro-Optical Properties of Liquid Crystals Composite with Zinc Oxide Nanoparticles

Cited by 67 publications

References 29 publications

Controlling the non-linear optical properties of MgO by tailoring the electronic structure

Controlling the non-linear optical properties of MgO by tailoring the electronic structure

Novel Plasmonic Data Storage Based on Nematic Liquid Crystal Layers

Hydrothermally Produced Cobalt Oxide Nanostructures at Different Temperatures and Effect on Phase Transition Temperature and Threshold Voltage of Nematic Liquid Crystal Host

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