Optical second-harmonic generation from jellium: the classical nonlinear and nonlocal response tensor studied via the CIB model

Hans Riis Jensen; Ole Keller

doi:10.1117/12.20468

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1 August 1990 Optical second-harmonic generation from jellium: the classical nonlinear and nonlocal response tensor studied via the CIB model

Hans Riis Jensen, Ole Keller

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Proceedings Volume 1273, Nonlinear Optical Materials III; (1990) https://doi.org/10.1117/12.20468
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands

Abstract

This paper describes a joint study of the structure and nonlinear optical properties of vacuum evaporated thin films of copper phthalocyanine (CuPc for brevity). Film thickness ranes from 50 to 500 nm. The anisotropic paramagnetic resonance of Cu ions reveals that the Pc rings lie almost parallel to the substrate plane with however a large angular distribution (300 FWHM). Third harmonic optical generation measurements performed at 1. 064 im and 1. 907 .tmfundamenta1 velengths give respectivel2 an average value of the cubic susceptibility = (4 0. 4) • 10 e. s. u. and (2. 1± O.2)• 1O e.s.u. These values, although significantly higher than for a common ionic crystal, are about one order of magnitude lower than in conjugated 1-D systems, which shows that the 2-D u-electron delocalization is less profitable than the l-D one. Besides third harmonic, we have also observed second harmonic generation. Its polarization dependence is characteristic of a quadratic susceptibility enhanced in one direction, almost pependicular to the substrate, with d 2 1O e.s.u. The possible origins eff of d are discussed. eff

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Hans Riis Jensen and Ole Keller "Optical second-harmonic generation from jellium: the classical nonlinear and nonlocal response tensor studied via the CIB model", Proc. SPIE 1273, Nonlinear Optical Materials III, (1 August 1990); https://doi.org/10.1117/12.20468

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