Organic materials for frequency doubling

Staring, E. G. J.; Rikken, G. L. J. A.; Seppen, C. J. E.; Nijhuis, S.; Venhuizen, A. H. J.

doi:10.1002/adma.19910030717

Cited by 19 publications

(3 citation statements)

References 26 publications

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“…In particular, these molecular organic compounds have received considerable attention as nonlinear optical materials due to their potentially high nonlinear effects and rapid response in electro-optic devices [3,4]. For example, the second harmonic generation (SHG) efficieny of benzaldehyde phenylhydrazone was evaluated to be higher than that of urea [5].…”

Section: Introductionmentioning

confidence: 99%

“…Hydrazone compounds having the general formula R 1 R 2 C=N-NHR 3 (R= alkyl or aryl groups), are substances formally derived from aldehydes or ketones by reaction with hydrazine or a hydrazine derivative. The hydrazones are well-known compounds for which methods of preparation and structural properties [1] as well as biological aspects [2] were reviewed recently.In particular, these molecular organic compounds have received considerable attention as nonlinear optical materials due to their potentially high nonlinear effects and rapid response in electro-optic devices [3,4]. For example, the second harmonic generation (SHG) efficieny of benzaldehyde phenylhydrazone was evaluated to be higher than that of urea [5].…”

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confidence: 99%

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On the roles of close shell interactions in the structure of acyl-substituted hydrazones: An experimental and theoretical approach

Saeed

Arshad

Bolte

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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The 2-(phenyl-hydrazono)-succinic acid dimethyl ester compound was synthesized by reacting phenylhydrazine with dimethylacetylene dicarboxylate at room temperature and characterized by elemental analysis, infrared, Raman, (1)H and (13)C NMR spectroscopies and mass spectrometry. Its solid state structure was determined by X-ray diffraction methods. The X-ray structure determination corroborates that the molecule is present in the crystal as the hydrazone tautomer, probably favored by a strong intramolecular N-H···O=C hydrogen bond occurring between the carbonyl (-C=O) and the hydrazone -C=N-NH- groups. A substantial fragment of the molecular skeleton is planar due to an extended π-bonding delocalization. The topological analysis of the electron densities (Atom in Molecule, AIM) allows characterization of intramolecular N-H···O interaction, that can be classified as a resonant assisted hydrogen bond (RAHB). Moreover, the Natural Bond Orbital population analysis confirms that a strong hyperconjugative lpO1→σ*(N2-H) remote interaction between the C2=O1 and N2-H groups takes place. Periodic system electron density and topological analysis have been applied to characterize the intermolecular interactions in the crystal. Weak intermolecular interactions determine the crystal packing, and the prevalence of non-directional dispersive contributions are inferred on topological grounds. The IR spectrum of the crystalline compound was investigated by means of density functional theory calculations carried out with periodic boundary conditions on the crystal, showing excellent agreement between theory and the experiments. The vibrational assignment is complemented with the analysis of the Raman spectrum.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

On the roles of close shell interactions in the structure of acyl-substituted hydrazones: An experimental and theoretical approach

Saeed

Arshad

Bolte

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Nonlinear optical (NLO) materials are now widely applied in biomedical imaging, photonics, and quantum optics . Of the NLO materials, the organics with donor-π conjugated-acceptor (D−π–A) structures have attracted great attention owing to their large hyperpolarizabilties, ultrafast responses, and low refractive indices. , Over the past decades, the development of new organic NLO materials with large nonlinear optical susceptibility and desirable orientations is being pursued for the applications of NLO devices . However, second harmonic generation (SHG) efficiency is limited by the nonlinear optical crystals’ intrinsic properties and also constrained by the sophisticated phase-matching conditions.…”

Section: Introductionmentioning

confidence: 99%

Engineering DAST Nanoscale-Thick Films for Giant and Isotropic Second Harmonic Generation: Implications for Bioimaging and Quantum Optics

Cheng

Zhang

et al. 2022

ACS Appl. Nano Mater.

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Second harmonic generation (SHG) is applied widely in frequency conversion, medical imaging, and quantum optics. 4-N,N-dimethylamino-4′-N′-methyl-stilbazolium tosylate (DAST) crystal, which is an outstanding organic nonlinear optical (NLO) material, has attracted considerable attention. To maximize its potential nonlinear properties, new degrees of freedomthe controls of the growth interface and temperature were explored to prepare DAST nanoscale-thick films with giant SHG in this work. Results reveal that a phase transition from a triclinic structure to a monoclinic structure in DAST nanoscale-thick films is initially and irreversibly induced at ∼120 °C. However, the ultrastrong SHG signal which is 4 orders of magnitude larger than those of both an unannealed DAST nanoscale-thick film and an inorganic potassium dihydrogen phosphate crystal can be measured from the DAST nanoscale-thick film deposited on the glass surface and annealed at 200 °C. This is attributed to a large second-order nonlinear susceptibility χ(2) of 7.24 nmV–1, high degree of structural ordering, formation of DAST single-crystal micro-platelets, and relaxation of the phase-matched condition in this case. Interestingly, the isotropic giant SHG response can be measured from such a DAST single-crystal nanoscale-thick film, attributed to the synergistic effects of the anisotropic DAST single-crystal micro-platelets with various preferential orientations distributed uniformly on the substrate surface and the interface interactions between DAST and the glass substrate. These findings shed light on the engineering of DAST nanostructures for significantly enhancing the SHG response, and particularly, they also pave an efficient way toward seeking the strongest nonlinear optical performances from DAST and other NLO organic materials for bioimaging and quantum optics.

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Co/Pt multilayers for magneto‐optical recording

Drent

1991

Advanced Materials

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Today, rewritable data storage based on magneto-optical (MO) recording technology is penetrating the professional data storage market. This technology"] combines the advantages of optical recording such as contactless and thus wearless recording, and a high areal density (> 10' bits/cm) with the, in principle, unlimited rewritability of magnetic recording.Unlike most magnetic recording media, the MO medium commonly has a magnetic easy axis along the film normal which is that strong that the magnetization lies perpendicular to the film plane. In a pre-saturated film, magnetic domains (bits) are written thermomagnetically by a pulsed diode laser. During writing, a static magnetic field is applied with its direction opposite to the original magnetization. This field is lower than the room temperature switching field of the medium but large enough to write reversed domains at elevated temperatures. In this way writing is limited to the heated area only. The size of this area is determined by the size of the diffraction limited spot and by the laser power and is typically 1 pm2 or smaller.The written information is read with the same laser now operating at a power level too low for writing, by detecting the so-called Kerr rotation of the linearly polarized incident light after reflection from the domain pattern. Up and down magnetization correspond to opposite rotation senses of the light vector. The read-out signal is proportional to the product Re, of the reflectivity R and the Kerr rotation 0,. ek is generally rather small, < 0.5 ', but Re, is sufficient for readout with a good signal-to-noise ratio. The smallest domain that can be read depends on the size of the laser spot which in turn depends on the numerical aperture of the focusing lens and the wavelength of the laser light. For the currently available diode lasers of 800 nm wavelength the spot size is about 1 pm'. This size decreases quadratically with decreasing wavelength. Therefore, one way to achieve storage densities higher than lo8 bits/cm2 is to use a laser operating at a wavelength shorter than 800 nm. These are not yet commercially available as solid-state lasers but progress has been made in developing visible-emitting lasers.[2, 31

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Organic materials for frequency doubling

Cited by 19 publications

References 26 publications

On the roles of close shell interactions in the structure of acyl-substituted hydrazones: An experimental and theoretical approach

On the roles of close shell interactions in the structure of acyl-substituted hydrazones: An experimental and theoretical approach

Engineering DAST Nanoscale-Thick Films for Giant and Isotropic Second Harmonic Generation: Implications for Bioimaging and Quantum Optics

Co/Pt multilayers for magneto‐optical recording

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