Morphology and polarization-dependent second harmonic generation in single hexagonal sodium niobate micro/nano-crystals

Xiao, Qiang; Lin, Wei; Chen, Gengxu; Ding, Can; Dong, Guoping; Lin, Chensheng; Wu, Botao; Wu, E; Zeng, Heping; Qiu, Jianrong

doi:10.1039/c5tc00226e

Cited by 14 publications

(8 citation statements)

References 34 publications

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“…2. The SHG signal intensity varied between its maximum and minimum and has a period of~45°rotation, which is in good agreement with crystals of space group (4 / m) 16,17 . By rotating the HWP, it is also possible to optimize the SHG signal intensities obtained from crystals, so that the signal intensity no longer depends on the sample container orientation.…”

Section: Detection Of In Vitro-grown Protein Crystals Utilizing the Msupporting

confidence: 80%

Protein-crystal detection with a compact multimodal multiphoton microscope

Cheng¹,

Chung

Schubert

et al. 2020

Commun Biol

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There is an increasing demand for rapid, effective methods to identify and detect protein micro- and nano-crystal suspensions for serial diffraction data collection at X-ray free-electron lasers or high-intensity micro-focus synchrotron radiation sources. Here, we demonstrate a compact multimodal, multiphoton microscope, driven by a fiber-based ultrafast laser, enabling excitation wavelengths at 775 nm and 1300 nm for nonlinear optical imaging, which simultaneously records second-harmonic generation, third-harmonic generation and three-photon excited ultraviolet fluorescence to identify and detect protein crystals with high sensitivity. The instrument serves as a valuable and important tool supporting sample scoring and sample optimization in biomolecular crystallography, which we hope will increase the capabilities and productivity of serial diffraction data collection in the future.

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Section: Detection Of In Vitro-grown Protein Crystals Utilizing the Msupporting

confidence: 80%

Protein-crystal detection with a compact multimodal multiphoton microscope

Cheng¹,

Chung

Schubert

et al. 2020

Commun Biol

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“…[9] However, SHG in micrometer-sized γ glycine has not been studied previously. While the global effect of morphology on the measured value of χ (2) is considered low for micrometer-scale materials as it is a volume-driven effect, [18] it is coupled with the influence of SHG directionality due to the sloped facets in transmission measurements, [19] which could amplify the effect in polymorphic organic microcrystals.…”

Section: Second-harmonic Generation (Shg) Is a Nonlinear Optical Procmentioning

confidence: 99%

“…To model the detected SHG, we use a method similar to previous works [ 18,20 ] which we expand to account for the effect of morphology of the sample on the incident beam and also incorporate the effect of birefringence [ 21 ] on the recovered susceptibility elements. The SHG polarization

P_{i}^{2 ω}

at frequency 2ω is equal to

\begin{matrix} P_{i}^{2 ω} = \sum_{j k} χ_{i j k}^{(2)} E_{j}^{ω} E_{k}^{ω} \end{matrix}

where

χ_{i j k}^{(2)}

is the second‐order susceptibility tensor and

E_{j}^{ω} E_{k}^{ω}

are the incident electric fields at frequency ω.…”

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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“…In addition, in comparison to those substrates, NaNbO 3 has Perovskite structure and excellent properties such as piezoelectric, ferroelectric, optoelectronics, nonlinear optical, and so on. In addition, we have studied the optical second harmonic generation (SHG) of single NaNbO 3 micro/nano-crystals with various morphologies and sizes, which exhibited strong nonlinear SHG responses 22 . Considering its advantages and based on our research foundation, we chose NaNbO 3 as the host material to dope with the classic up-conversion ionic pair, Er 3+ /Yb 3+ , which can convert low-energy infrared photons to high-energy visible light.…”

mentioning

confidence: 99%

Dynamically Tuning the Up-conversion Luminescence of Er3+/Yb3+ Co-doped Sodium Niobate Nano-crystals through Magnetic Field

Xiao

Zhang

et al. 2016

Sci Rep

Self Cite

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In this work, we show here that the up-conversion luminescence of NaNbO3:Er3+/Yb3+ nano-materials can be modulated by magnetic field and a enhancement of up-conversion intensities by a factor of about 2 for Er3+:4S3/2 → 4I15/2 obtained at 30 T and about 5.4 for Er3+:4F9/2 → 4I15/2 obtained at 20 T. The increased up-conversion luminescence are mainly interpreted in terms of the enhanced non-radiation transition from 4I11/2 to 4I13/2 of Er3+ ions and the spin-orbital coupling (that is “mixing” effect) in crystal field by an external magnetic field. Meanwhile, we observed continuously spectra broadening with growing the magnetic field intensity, which is ascribed to the “mixing” effect induced by magnetic field and the difference of g factor of sub-bands. This bi-functional material with controllable optical-magnetic interactions has various potential applications, such as optical detection of magnetic field, etc.

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Morphology and polarization-dependent second harmonic generation in single hexagonal sodium niobate micro/nano-crystals

Abstract: The SHG responses from single hexagonal NaNbO3 micro/nano-crystals with different morphologies and sizes were studied in detail. It was demonstrated that the same crystal structure displays a similar SHG response.

Cited by 14 publications

References 34 publications

Protein-crystal detection with a compact multimodal multiphoton microscope

Protein-crystal detection with a compact multimodal multiphoton microscope

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

Dynamically Tuning the Up-conversion Luminescence of Er3+/Yb3+ Co-doped Sodium Niobate Nano-crystals through Magnetic Field

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