Third harmonic generation spectra of degenerate ground state derivatives of poly (1,6-heptadiyne)

Halvorson, C.; Wu, R.; Moses, D.; Wudl, Fred; Heeger, Alan J.

doi:10.1016/0009-2614(93)87112-g

Cited by 11 publications

(6 citation statements)

References 16 publications

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“…[32][33][34][35][36][37][38] Over the past two decades, THG has emerged as a useful nonlinear spectroscopy tool [39][40][41][42][43] that has been widely used to identify two-and three-photon resonances in solids and thin films. 29,35,37,38,[44][45][46][47][48] In addition, this work indicates a sensitive THG dependence on the molecular structures and interactions of solutes and solvents. [49][50][51] Here we report on THG at the solution/glass interface as a means to explore the contribution of electronic resonances to THG spectra of solution-phase biocompounds.…”

Section: Introductionmentioning

confidence: 65%

Spectroscopy of third-harmonic generation: evidence for resonances in model compounds and ligated hemoglobin

et al. 2006

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We report on third-harmonic generation (THG) of biomolecular solutions at the fluid/glass interface as a means to probe resonant contributions to their nonlinear absorption spectra that could serve as contrast mechanisms for functional imaging. Our source was 100 fs laser pulses whose center wavelength varied from 760 to 1000 nm. We find evidence of a two-photon resonance in the ratio of third-order susceptibilities, sample ͑3͒ ͑3͒ / glass ͑3͒ , for aqueous solutions of Rhodamine B, Fura-2, and hemoglobin and a three-photon resonance in sample ͑3͒ ͑3͒ / glass ͑3͒ for solutions of bovine serum albumin. Consistent with past work, we find evidence of a one-photon resonance of sample ͑3͒ ͑3͒ / glass ͑3͒ for water, while confirming a lack of resonant enhancement for benzene. At physiological concentrations, hemoglobin in different ligand-binding states could be distinguished on the basis of features of its THG spectrum.

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Section: Introductionmentioning

confidence: 65%

Spectroscopy of third-harmonic generation: evidence for resonances in model compounds and ligated hemoglobin

et al. 2006

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“…It is also instructive to examine the evolution of the nonlinearity with increasing conjugation length (L) or, equivalently, the number of π-electrons. For polymethines, it has been demonstrated that both μ ge and 1/E ge scale as L; 43 therefore, since the N term scales as μ ge 4 and…”

Section: Nonlinear Optical Response Of Various Molecularmentioning

confidence: 99%

Design of Organic Chromophores for All-Optical Signal Processing Applications

et al. 2013

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Organic materials possess many key attributes that make them suitable for exploitation in all-optical signal processing applications including facile tunability of their optical properties, strong and ultrafast nonlinear optical response, and potential for integration into device structures. In this perspective, we present molecular design guidelines for organic chromophores that could serve as the active constituents for such materials. Using a relatively simple model, a candidate class of chromophores, namely cyanine-like polymethines, is identified based on promising microscopic nonlinear optical properties in the near-IR spectral region. The challenges associated with translating these microscopic properties into materials with macroscopic properties suitable for device applications are presented along with molecular engineering approaches for overcoming these hurdles.

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“…While there has been much research aimed at increasing the magnitude of χ (3) , a key problem is that many materials are limited by large nonlinear absorption values (Imχ (3) ), large linear absorption loss, and lack of processability into optical quality films. Strategies that have been pursued to increase nonlinearity include extending conjugation length in polymers such as polyacetylene and polydiacetylenes , and optimizing the bond length (or bond order) alternation in donor−acceptor conjugated molecules or polymethines. − In the latter approach, it has been shown that cyanine-like molecules with vanishing bond length alternation show optimized negative third-order polarizability for discrete molecules of relatively short chain lengths. In this Communication, we report on “cyanine-like” bisdioxaborine polymethines that show very large negative Reχ (3) and small Imχ (3) values in the near-infrared spectral region.…”

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confidence: 99%

Bisdioxaborine Polymethines with Large Third-Order Nonlinearities for All-Optical Signal Processing

et al. 2006

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Organic materials with large third-order nonlinearities in the near-infrared spectral regime are critical in the development of photonic devices to be utilized in all-optical signal processing. We have developed polymethine materials, specifically bisdioxaborine-terminated polymethine dyes, which possess large ultrafast third-order nonlinearities and low nonlinear loss all in the near-infrared spectral regime. An extended bisdioxaborine polymethine anion exhibited the largest value of gamma (third-order microscopic nonlinearity) at 1.3 mum (|gamma| = 5.7 x 10-32 esu) and showed no characteristics of symmetry breaking, unlike other polymethines of similar lengths. A neat film of this molecule maintained relatively low linear loss in the near-infrared and showed a large third-order macroscopic nonlinearity at 1.3 mum (|chi(3)| = 3.6 x 10-10 esu), with a temporal response of less than 8 ps. Furthermore, the real part of chi(3) was nearly an order-of-magnitude larger than the imaginary component. Consequently, this material exhibited good figures of merit for all-optical signal processing throughout the entire telecommunications band.

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Third harmonic generation spectra of degenerate ground state derivatives of poly (1,6-heptadiyne)

Cited by 11 publications

References 16 publications

Spectroscopy of third-harmonic generation: evidence for resonances in model compounds and ligated hemoglobin

Spectroscopy of third-harmonic generation: evidence for resonances in model compounds and ligated hemoglobin

Design of Organic Chromophores for All-Optical Signal Processing Applications

Bisdioxaborine Polymethines with Large Third-Order Nonlinearities for All-Optical Signal Processing

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