Polymeric Materials and their Orientation Techniques for Second-Order Nonlinear Optics

Kajzar, F.; Lee, Kwang-Sup; Jen, Alex K.‐Y.

doi:10.1007/3-540-45642-2_1

Cited by 203 publications

(54 citation statements)

References 163 publications

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“…Such polarization is widely reported in the poling of polymers loaded with similar dye molecules, and can be assisted by thermal and optical effects. [17][18][19] Such poling effects are often associated with a simultaneous reconfiguration of the internal degrees of freedom of the molecule. The magnitude of the polarization required to produce the effects we have observed can be estimated using a description proposed by Kobayashi et al [3] This description is based on the assumption that when the gate voltage is equal to the threshold voltage the applied gate electric field exactly compensates the remnant polarization P rem of the DR19 layer.…”

Section: à2mentioning

confidence: 99%

Dipolar Chromophore Functional Layers in Organic Field Effect Transistors

et al. 2008

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A layer of functionalized disperse red 19 (DR19) chromophore molecules leads to novel reversible photoelectrical characteristics in organic thin film field effect transistor. Photoassisted poling, along with the change in the dipole of the DR19 under illumination, and photoinduced charge transfer to electron traps in the DR19 layer combine to change the threshold voltage of transistors by up to 100 V.

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Section: à2mentioning

confidence: 99%

Dipolar Chromophore Functional Layers in Organic Field Effect Transistors

et al. 2008

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“…This organization is either through self-assembly such as crystallization [23], or by directed assembly methods such as Langmuir-Blodgett-Kuhn deposition [24], layer-by-layer deposition [25]- [27], and, in the case of polymer films, electric field poling [28]. These methods of aligning molecules are quite different from those present in nature.…”

mentioning

confidence: 99%

Sum-frequency spectroscopy and imaging of aligned helical polypeptides

Knoesen

Pakalnis

Zhao

et al. 2004

IEEE J. Select. Topics Quantum Electron.

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Abstract-The sum-frequency spectroscopy signatures of NH-(amide A) and C = O (amide I) groups, the amide segments in all proteins, are measured in thin films that consist of an ensemble of right-handed, helical poly--benzyl-L-glutamate (PBLG) macromolecules that are endgrafted and self-organized into a monomolecular film with a large degree of unidirectional order. Distinct sum-frequency spectral signatures associated with the amide A and the amide I bands are observed because of a strong noncentro-symmetry produced by intra-and intermolecular forces. Hydrogen bonding self-organizes amino and acidic groups within the molecular helical scaffold. In an endgrafted thin film, repulsive electrostatic forces between PBLG macromolecules stabilize the organization between molecules. The average orientation of the PBLG chain was measured. Imaging scans using sum-frequency generation, complemented by atomic force microscopy, were used to investigate the uniformity of orientation of the PBLG chains.

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“…These materials have very strong potential applications as active materials in photonic micro devices such as: EO modulators, optical switches, THz generation, digital signal processing, phased array radar, and so on [1][2][3][4][5][6]. But these applications have the same requirements: large EO properties both at the molecular level and as elaborated materials [7][8][9]. Tricyanofuran-and tricyanopyrroline-based chromophores are employed in the design of highly active NLO chromophore; these chromophores have large ground state dipole moments and exhibit electronic transitions at a long wavelength [10,11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of novel polyarylate with elecrooptical chromophores as side chain as electro-optic host polymer

et al. 2012

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Two novel soluble polyarylates with different nonlinear optical chromophores as the side chains were prepared and characterized by UV-visible spectra, nuclear magnetic resonance, and infrared spectroscopy. The titled polymers show us good thermal stability; the thermal decomposition temperature values were 201 and 253°C, respectively, for polymer sPAR-CTCF and sPAR-CTCP. The glass transition temperatures were 139 and 122°C for sPAR-CTCF and sPAR-CTCP, respectively. Chromophore FTC-wl was doped in these polymers as a guest chromophore to form binary chromophore electro-optic (EO) system. And super large EO coefficients (124 pm/V) were found from FTC-wl-doped sPAR-CTCP binary chromophore system at high chromophore loading density.

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Polymeric Materials and their Orientation Techniques for Second-Order Nonlinear Optics

Cited by 203 publications

References 163 publications

Dipolar Chromophore Functional Layers in Organic Field Effect Transistors

Dipolar Chromophore Functional Layers in Organic Field Effect Transistors

Sum-frequency spectroscopy and imaging of aligned helical polypeptides

Synthesis of novel polyarylate with elecrooptical chromophores as side chain as electro-optic host polymer

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