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A Study of Chirality in Gold Nanostructures with Second Harmonic Generation

100%
Valev V., Silhanek A., Gillijns W., Moshchalkov V., Verbiest T.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
498-500
EN
We present the second harmonic generation - circular dichroism response from G-shaped gold nanostructures for P-polarized incoming light. By eliminating the contributions of anisotropy to the signal, an absolute measure of the second harmonic generation - circular dichroism is presented. The system of planar nanostructures is an excellent model for studying the correlation between optical properties and chiral morphology at the nanoscale. Samples with both enantiomorphs of the chiral pattern were prepared and, demonstrating the unambiguous presence of chirality, the second harmonic generation - circular dichroism response from two such samples was fitted simultaneously with a single set of fitting parameters.
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A Spectroscopic Study on the Nonlinear Optical Susceptibilities of Organic Molecules

86%
Foerier S., Valev V., Koeckelberghs G., Kolmychek I., Aksipetrov O., Verbiest T.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
927-934
EN
We report on the investigation of the spectral dependence of nonlinear optical susceptibilities, that describe second harmonic generation - circular dichroism, the nonlinear optical analogue of circular dichroism. The design and implementation of a state of the art experimental setup, used for the characterization of a series of organic molecules in the near-infrared range, will be discussed. We emphasize on the main characteristics like wavelength control, polarization and data-acquisition to present the setup. Some preliminary results show its strength to detect chirality at the molecular and supramolecular level.
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