RESONANT-OPTICAL-2ND-HARMONIC GENERATION FROM THIN C-60 FILMS

被引:56
作者
KOOPMANS, B
ANEMA, A
JONKMAN, HT
SAWATZKY, GA
VANDERWOUDE, F
机构
[1] Laboratory of Solid State Physics, Materials Science Centre, University of Groningen, 9747 AG Groningen
来源
PHYSICAL REVIEW B | 1993年 / 48卷 / 04期
关键词
D O I
10.1103/PhysRevB.48.2759
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We studied the optical-second-harmonic generation from thin C60 films, using a combination of frequency-, rotational-, angular-, and film-thickness-dependent measurements. We present a method to resolve the phase of chi(2) by exploiting the interference between the C60 overlayer contribution and the anisotropic Si(111) substrate contributions. We find a strong and sharp resonance at 2HBARomega = 3.60 eV. The linewidth is found to be surprisingly small as compared to linear ellipsometry and third-harmonic-generation experiments. The intensity as a function of film thickness agrees with a model considering interference effects between equal second-harmonic contributions- from the inner C60/Si interface and the outer C60 surface. The possibility of nonlocal bulk contributions is discussed.
引用
收藏
页码:2759 / 2764
页数:6
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