Efficiency studies of second-harmonic-active organic dye coverages

Marowsky, G.; Gierulski, A.; Steinhoff, R.; Dorsch, Dieter; Eidenschnik, R.; Rieger, B.

doi:10.1364/josab.4.000956

Cited by 34 publications

(6 citation statements)

References 37 publications

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“…We fabricated the LB films of NaBuPc by Z-type deposition to investigate their SHG activity. The macroscopic second-order susceptibility (χ (2) ) and the molecular hyperpolarizability (β) of the LB films on a quartz substrate were determined using the following equations: − where l is the film thickness, I ω is the incident intensity, n ω and n 2 ω are the refractive indices at 1.064 μm and 532 nm, f ω,2ω = [( n ω,2ω ) 2 + 2]/3 is a local field factor and ρ is the surface density of the monolayer. By comparison with the signal from the quartz (Y-cut) reference, the SH intensity and other parameters are listed in Table .…”

Section: Resultsmentioning

confidence: 99%

Characterization, Second-Harmonic Generation, and Gas-Sensitive Properties of Langmuir−Blodgett Films of 1,8-Naphthalimide-tri-tert-butylphthalocyanine

Liu

Hu$^{

et al. 2000

J. Phys. Chem. B

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Langmuir−Blodgett (LB) films of a new metal-free asymmetrically substituted phthalocyanine (Pc), 1,8-naphthalimide-tri-tert-butylphthalocyanine (NaBuPc), were fabricated and characterized by UV−vis spectrometry, atomic force microscopy, and small-angle X-ray diffraction (SAXRD). The results proved that the asymmetrically substituted Pc not only possesses good solubility in common organic solvents but also possesses an ideal LB film forming ability. From its surface pressure−area isotherm and SAXRD pattern, the configuration of the phthalocyanine molecules both at the air−water interface and in the LB films was demonstrated at a tilted angle (72°) to the water surface or solid substrate. The second-harmonic generation (SHG) of a three-layer LB film of NaBuPc was measured. Its SH intensity relative to a Y-cut quartz wedge is approximately 1.76. The values of second-order susceptibility (χ(2)) and the molecular hyperpolarizability (β) from the multilayers are 8.32 × 10-9 and 5.97 × 10-30 esu, respectively. Gas sensors based on the LB films of NaBuPc demonstrated good gas sensitivity to nitrogen dioxide at room temperature. A linear relationship between the logarithm of the concentration of NO2 and the resistance of the sensor was observed, providing a basis for the application as gas sensors in the future.

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Section: Resultsmentioning

confidence: 99%

Characterization, Second-Harmonic Generation, and Gas-Sensitive Properties of Langmuir−Blodgett Films of 1,8-Naphthalimide-tri-tert-butylphthalocyanine

Liu

Hu$^{

et al. 2000

J. Phys. Chem. B

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“…3. Note that the polarization dependence observed is characteristic of a surface type generation [10], but to clearly understand the experimental measurements we consider a theoretical model that includes all 3-D aspects of the interaction taking place in such material structure: The ratio among the several nonzero elements of the nonlinear hyperpolarizability tensor, the spherical distribution of dielectric material in a unit cell, and the organization of the spheres in a 3-D lattice. After the chemical bond between the nonlinear molecule and the sphere surface is formed the ethanol CV will lay flat on the surface of the charged polystyrene sphere.…”

Section: Quadratic Nonlinear Interaction In 3-d Centrosymmetric Photomentioning

confidence: 99%

Visible second-harmonic light generated from a self-organized centrosymmetric lattice of nanospheres

et al. 2006

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We designed and fabricated a centrosymmetric material where one may be able to consider an efficient quadratic nonlinear interaction. We followed a solid phase-supported organic synthesis methodology to covalently bind a large number of highly nonlinear molecules to the surface of polystyrene nanospheres. Such chemically modified optically nonlinear latex spheres, when suspended in water, are seen to perfectly self-organize into a centrosymmetric lattice. Taking advantage of the nonlinear interaction located at the sphere-water interface and the photonic crystal properties of the fabricated material we were able to generate second-harmonic light visible to the naked eye.

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“…Therefore, it is essential to control the molecular packing within the organized assemblies (6)(7)(8). In addition, characterization of the component molecules in these assemblies, especially in molecular thin films, has also been the subject of a number of studies (9)(10)(11)(12)(13)(14). In recent years, optical second harmonic generation (SHG) has developed into a useful probe of adsorbed molecules on surfaces (15)(16)(17).…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Chromophore Orientation of Rhodamine B Amphiphiles in Langmuir–Blodgett Monolayers

Ishibashi

Sato

Baba

et al. 2001

Journal of Colloid and Interface Science

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Efficiency studies of second-harmonic-active organic dye coverages

Cited by 34 publications

References 37 publications

Characterization, Second-Harmonic Generation, and Gas-Sensitive Properties of Langmuir−Blodgett Films of 1,8-Naphthalimide-tri-tert-butylphthalocyanine

Characterization, Second-Harmonic Generation, and Gas-Sensitive Properties of Langmuir−Blodgett Films of 1,8-Naphthalimide-tri-tert-butylphthalocyanine

Visible second-harmonic light generated from a self-organized centrosymmetric lattice of nanospheres

Characterization of the Chromophore Orientation of Rhodamine B Amphiphiles in Langmuir–Blodgett Monolayers

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