Novel report on γ-glycine crystal yielding high second harmonic generation efficiency

Shkir, Mohd.; Ramteke, S.P.; Shirsat, M.D.; Muley, G.G.; Baig, M.I.

doi:10.1016/j.optmat.2017.07.007

Cited by 56 publications

(9 citation statements)

References 44 publications

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“…Luminescence is the vital nondestructive technique which facilitates the sufficient understanding of radiative and non‐radiative recombination rates which further on analysis provides the necessary information concerning the materials purity. The non‐radiative rates are associated with impurities/defects in the material which pronounces the vitality of this technique when it comes to assess the purity of the material . It is noticeable and attention grabbing fact that pure KDOP crystal does not exhibit luminescence at room temperature and incorporation of organic dopant like TA may reinforce some appealing photochemical and photophysical phenomenon which could be interesting to investigate.…”

Section: Resultsmentioning

confidence: 99%

Optimizing Structural, Microhardness, Surface Growth Mechanism, Luminescence and Thermal Traits of KH₂PO₄ Crystal Exploiting Multidirectional H‐Bonding Quality of Dopant Tartaric Acid

Shkir

Baig

Pandian³

et al. 2018

Crystal Research and Technology

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High-end nonlinear optical devices demand superior quality KH 2 PO 4 crystal and to meet this necessity slow solvent evaporation technique is employed to grow optical quality potassium dihydrogen orthophosphate (KH 2 PO 4 , KDOP) crystal by doping tartaric acid (TA) and special attention is devoted to optimize the defect influenced properties of KDOP crystal. The incorporation of TA in KDOP crystal matrix is evaluated by employing energy dispersive spectroscopic technique. The crystalline phase and structural dimensions of pure and TA doped KDOP crystal is evaluated by means of powder X-ray diffraction analysis. The luminescence behavior of TA doped KDOP crystal is examined in visible region and violet colored emission is evidenced at 408 nm. The Vickers microhardness studies are carried out to uncover the constructive influence of TA on hardness and elastic stiffness coefficient of KDOP crystal. Impressive role of TA in minimizing defect density and improving the surface growth mechanism of KDOP crystal is explored by chemical etching analysis. The thermogravimetric analysis curve is traced within 30-650°C and TA doped KDOP crystal is found thermally stale up to 233°C. The results are appraised to propose the suitability of TA doped KDOP crystal for distinct applications.

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Section: Resultsmentioning

confidence: 99%

Optimizing Structural, Microhardness, Surface Growth Mechanism, Luminescence and Thermal Traits of KH₂PO₄ Crystal Exploiting Multidirectional H‐Bonding Quality of Dopant Tartaric Acid

Shkir

Baig

Pandian³

et al. 2018

Crystal Research and Technology

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“…The γ-polymorph has also remarkable non-linear optical properties and can be used for second harmonic generation (SHG). [278][279][280][281] This property can also find biomedical applications, such as diagnostic imaging. SHG can provide disease diagnosis through characterization of biological building blocks.…”

Section: Physical Propertiesmentioning

confidence: 99%

Glycine: The Gift that Keeps on Giving

Boldyreva

2021

Israel Journal of Chemistry

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Glycine is a small molecule. It cannot change its conformation and is achiral. Despite the apparent simplicity, glycine shows endless diversity in its behavior over many phenomena. It was the first amino acid for which polymorphism was reported, first on crystallization and then on hydrostatic compression. The polymorphs differ in their physical properties and their biological activity. Glycine clusters persist in solution, leading to "solution memory". Phenomena at interfaces are critically important for crystal growth, dissolution, and for physical properties, which can be at times unexpected, like polarity in centrosymmetric αpolymorph. It is a great pleasure to remind of these remarkable phenomena in a special issue honoring professors Meir Lahav and Leslie Leiserowitz, who pioneered the study of the behavior of this unique molecule in many respects, and showed how complex and non-trivial phenomena can be at interfaces: between phases and between research fields.

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“…[ 15 ] β glycine microneedles have been characterizing in reflection SHG measurements to have an effective susceptibility around 50% greater than z‐cut quartz but discrepancies were seen between modelling and experimental data. [ 16 ] The γ‐phase effective χ (2) has been measured to range from 0.24 pm V −1 for 600 µm particles, [ 15 ] up to 1.92 pm V −1 for single crystals, [ 17 ] an order of magnitude lower than experimental piezoelectric measurements. [ 9 ] However, SHG in micrometer‐sized γ glycine has not been studied previously.…”

Section: Figurementioning

confidence: 99%

Quantitative Polarization‐Resolved Second‐Harmonic‐Generation Microscopy of Glycine Microneedles

et al. 2020

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amino acids, peptides, and proteins offers a noncontact, label-free and nondestructive method of obtaining a better understanding of disease processes both in vitro and in vivo. SHG has further applications in nanoscale characterization, [5] measurement of field-induced carrier motion in photonic devices, [6] and in the development of micro/nanoscale lasers. [7] Qualitative comparison of SHG conversion efficiency suffers from not having a clear benchmark of quantitative values of tensor elements. First principles modeling to obtain quantitative values of the susceptibility tensor such as time-dependent density functional theory is computationally demanding for typical ≥100 atom biomolecule cells and also needs to be benchmarked against experimental values. [8] The β and γ phases of glycine have been recently reported to possess high piezoelectric strain constants. [9] As both the strain and susceptibility tensors of a piezoelectric crystal have an equivalent third rank tensor form, the quantitative susceptibility tensor of glycine crystals provides a useful benchmark for SHG imaging of hierarchical structures in biology that could speed development of quantitative tissue imaging and diseases diagnosis. [10] Glycine is the simplest and only achiral amino acid with a single hydrogen as its side chain, NH 3 + CH 2 COO −. It crystallizes in three distinct phases under ambient conditions α, β, and γ. The carboxyl (COOH) and amino (NH 2) terminal groups become charged to form the zwitterion. [11] The α-phase crystallizes in space group P2 1 /c, comprising of centrosymmetric double layers of zwitterions linked via hydrogen bonds. [12] For this polymorph the presence of a center of symmetry precludes SHG. The β phase shows space group P2 1 and is composed of double layers of zwitterions but the molecular packing is noncentrosymmetric. The γ phase is also SHG active, crystallizing in the noncentrosymmetric trigonal space group P3 1, which forms a 3D molecular network with the zwitterions arranged in helices around the 3 1 screw axis. [13] The difference in properties between phases is due to the differing zwitterion stacking and internal bond angles. [14] Both of the noncentrosymmetric phases of glycine have shown potential as a biocompatible NLO material (Table S1, Supporting Information). A 21 µm thick layer of β glycine nanofibers has been shown to have a larger effective χ (2) relative to 600 µm particles of β glycine due to their subcoherence

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Novel report on γ-glycine crystal yielding high second harmonic generation efficiency

Cited by 56 publications

References 44 publications

Optimizing Structural, Microhardness, Surface Growth Mechanism, Luminescence and Thermal Traits of KH₂PO₄ Crystal Exploiting Multidirectional H‐Bonding Quality of Dopant Tartaric Acid

Optimizing Structural, Microhardness, Surface Growth Mechanism, Luminescence and Thermal Traits of KH₂PO₄ Crystal Exploiting Multidirectional H‐Bonding Quality of Dopant Tartaric Acid

Glycine: The Gift that Keeps on Giving

Quantitative Polarization‐Resolved Second‐Harmonic‐Generation Microscopy of Glycine Microneedles

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Novel report on γ-glycine crystal yielding high second harmonic generation efficiency

Cited by 56 publications

References 44 publications

Optimizing Structural, Microhardness, Surface Growth Mechanism, Luminescence and Thermal Traits of KH2PO4 Crystal Exploiting Multidirectional H‐Bonding Quality of Dopant Tartaric Acid

Optimizing Structural, Microhardness, Surface Growth Mechanism, Luminescence and Thermal Traits of KH2PO4 Crystal Exploiting Multidirectional H‐Bonding Quality of Dopant Tartaric Acid

Glycine: The Gift that Keeps on Giving

Quantitative Polarization‐Resolved Second‐Harmonic‐Generation Microscopy of Glycine Microneedles

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Product

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Optimizing Structural, Microhardness, Surface Growth Mechanism, Luminescence and Thermal Traits of KH₂PO₄ Crystal Exploiting Multidirectional H‐Bonding Quality of Dopant Tartaric Acid

Optimizing Structural, Microhardness, Surface Growth Mechanism, Luminescence and Thermal Traits of KH₂PO₄ Crystal Exploiting Multidirectional H‐Bonding Quality of Dopant Tartaric Acid