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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling constants depend...
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The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
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Quasi-light Storage for Optical Data Packets
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Published on: February 6, 2014

Bisdioxaborine polymethines with large third-order nonlinearities for all-optical signal processing.

Joel M Hales1, Shijun Zheng, Stephen Barlow

  • 1School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA.

Journal of the American Chemical Society
|August 31, 2006
PubMed
Summary

New polymethine dyes offer significant advancements for all-optical signal processing. These organic materials exhibit large, ultrafast third-order nonlinearities and low loss in the near-infrared, crucial for photonic devices.

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Area of Science:

  • Organic nonlinear optics
  • Materials science for photonics
  • All-optical signal processing

Background:

  • Organic materials with large third-order nonlinearities are essential for all-optical signal processing.
  • The near-infrared spectral regime is critical for photonic device development.

Purpose of the Study:

  • To develop novel polymethine materials with enhanced third-order nonlinear optical properties.
  • To investigate bisdioxaborine-terminated polymethine dyes for near-infrared applications.

Main Methods:

  • Synthesis and characterization of extended bisdioxaborine polymethine anions.
  • Measurement of third-order microscopic nonlinearity (gamma) at 1.3 µm.
  • Evaluation of linear and nonlinear optical properties of neat films, including third-order macroscopic nonlinearity (chi(3)) and temporal response.

Main Results:

  • An extended bisdioxaborine polymethine anion demonstrated a large third-order microscopic nonlinearity (|gamma| = 5.7 x 10^-32 esu) at 1.3 µm without symmetry breaking.
  • Neat films exhibited low linear loss and a significant third-order macroscopic nonlinearity (|chi(3)| = 3.6 x 10^-10 esu) with a <8 ps response time.
  • The real part of chi(3) was substantially larger than the imaginary component.

Conclusions:

  • The developed bisdioxaborine polymethine dyes possess excellent figures of merit for all-optical signal processing.
  • These materials are suitable for applications across the entire telecommunications band.
  • The study highlights the potential of these organic materials for advanced photonic devices.