NDLI: Interference between second-harmonic generation from a substrate and from an adsorbate layer

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Interference between second-harmonic generation from a substrate and from an adsorbate layer

Content Provider	Semantic Scholar
Author	Berkovic, Garry Shen, Yuen Ron
Copyright Year	2002
Abstract	INTRODUCTION In recent years optical second-harmonic generation (SHG) has developed into a useful probe of adsorbate molecules on surfaces.", 2 It has been applied to a wide variety of adsorbate-covered surfaces, ranging from single crystals under ultrahigh vacuum conditions3'4 to liquids and amorphous solids under ambient conditions.5-1" From these experiments it is possible to deduce concentration and orientation of molecular adsorbates 5 as well as to observe desorption, 4 two-dimensional phase transitions,6 and chemical reactions7 of the adsorbed species. Furthermore, SHG from a monolayer of an adsorbate molecular species has been used for measuring second-order nonlinear-optical coefficients of molecules. ' 9 The fact that SHG can be used as a surface probe for such a wide variety of uses stems from the high surface selectivity and specificity inherent in SHG. This is because, as a second-order process, SHG is forbidden under the electricdipole approximation in a medium with central symmetry, but the symmetry is necessarily broken at a surface.'2 Consider, for example, SHG from reflection at an air-solid interface. The effective surface nonlinear polarization responsible for the SHG is given by'
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://pubman.mpdl.mpg.de/pubman/item/escidoc:2395444/component/escidoc:2395450/2395444.pdf?mode=download
Language	English
Access Restriction	Open
Subject Keyword	Antidepressive Agents, Second-Generation Approximation Coefficient Experiment Interface Device Component Interference (communication) Liquid substance Nonlinear system Polarization (waves) Segmented Hyper Graphics Selectivity (electronic) Sensitivity and specificity Substrate (electronics) solid substance
Content Type	Text
Resource Type	Article

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