Showing papers by "Y. R. Shen published in 1981"
TL;DR: Second harmonic generation at a silver-air interface was enhanced due to surface roughness by a factor of 10{sup 4} as mentioned in this paper, which is believed to be responsible for the effect An unusually broad luminescence background extending far beyond the antiStokes side of the second harmonic was also observed
Abstract: Second harmonic generation at a silver-air interface was enhanced due to surface roughness by a factor of 10{sup 4} The local field enhancement is believed to be responsible for the effect An unusually broad luminescence background extending far beyond the antiStokes side of the second harmonic was also observed
440 citations
TL;DR: In this article, second-harmonic generation is shown to be sensitive enough to detect molecular monolayers adsorbed on a silver surface, which can be easily observed during and after an electrolytic cycle.
Abstract: Second-harmonic generation is shown to be sensitive enough to detect molecular monolayers adsorbed on a silver surface. Adsorption of AgCl and pyridine on silver during and after an electrolytic cycle can be easily observed.
145 citations
TL;DR: In this article, an increase in the optical second-harmonic signal arising from an electrochemically treated silver surface upon adsorption of a monolayer of the centrosymmetric molecule pyrazine is reported and an effective second-order non-linear polarizability for the adsorbed species deduced.
43 citations
TL;DR: In this paper, the authors describe the preliminary results of their recent venture in this area and describe the possibility of using surface nonlinear optics for material studies, which is a very interesting topic.
Abstract: Surface electromagnetic waves are waves propagating along the interface of two media. Their existence was predicted by SOMMERFIELD in 1909 [1]. In recent years, they have found interesting applications in the study of overlayers and molecular adsorption on surfaces [2], in probing of phase transitions [3], and in measurements of refractive indices [4]. In our laboratory, we have been interested in the nonlinear interaction of surface electromagnetic waves. The motivation is two fold. First, while nonlinear optics in the bulk is a well developed field, surface nonlinear optics is still in its infant stage. Second, we would like to look into the possibility of using surface nonlinear optics for material studies. In this paper, we describe the preliminary results of our recent venture in this area.
12 citations
TL;DR: In this article, four-wave mixing with two circularly polarized counter-propagating waves inducing a helical birefringence structure can be used to measure a number of material parameters of a liquid crystalline medium.
Abstract: Four-wave mixing with two circularly polarized counter-propagating waves inducing a helical birefringence structure can be used to measure a number of material parameters of a liquid crystalline medium. Application to a cholesteric substance is particularly interesting. A resonant effect is expected when the induced helix has a pitch coinciding with the natural helical pitch of the medium towards the isotropic → cholesteric transition. Field-induced shift in the transition temperature is also expected.
5 citations
01 Jan 1981
TL;DR: In this paper, the feasibility of using second-harmonic generation to detect the adsorption of molecular monolayers on a metal surface in an electrolytic solution is discussed.
Abstract: The observation of a number of surface-enhanced nonlinear optical effects is discussed. The feasibility of using second-harmonic generation to detect the adsorption of molecular monolayers on a metal surface in an electrolytic solution is shown.
1 citations