Characterisation of the solid-water interface using sum-frequency spectroscopy

The nonlinear optical effect known as sum-frequency generation is used to generate vibrational spectra of molecules adsorbed at interfaces. The characteristics of sum-frequency spectroscopy (SFS) are described and the unique features that make SFS well-suited to the study of the solid-water interface are explained. Examples of sum-frequency spectra of organised molecular systems are presented, with particular emphasis on the effect of interactions with other species in solution. Future developments of relevance to biosensor research are briefly addressed.     

Human gaze is systematically offset from the center of cone topography

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Local Field Spectroscopy of Metal Dimers by TPL Microscopy

We report on two-photon photoluminescence (TPL) spectroscopy on metal dimers made of two gold nanoparticles separated by subwavelength distances. A direct comparison with far-field scattering measurements shows that TPL provides additional data on the structure modes of major importance for their use in surface-enhanced Raman scattering, enhanced fluorescence, and sensing.