SURFACE ENHANCED 2ND HARMONIC-GENERATION IN COLD DEPOSITED SILVER FILMS AND SCANNING TUNNELING MICROSCOPY

被引：9
作者：
AKTSIPETROV, OA
NIKULIN, AA
PANOV, VI
VASILEV, SI
机构：
[1] Physics Department, Moscow State University, Moscow
来源：
SOLID STATE COMMUNICATIONS | 1990年 / 73卷 / 06期
关键词：
D O I：
10.1016/0038-1098(90)90041-9
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The nature of surface enhancement in cold deposited silver films (CDF) is studied by means of reflected second harmonic (RSH) generation and scanning tunneling microscopy. A strong dependence of RSH radiation intensity, polarization and angular distribution on film mass thickness and temperature is observed. The surface enhancement vanishes irreversibly in CDF heated up to >220 K. Intercrystallite fractures (pores) are detected in the structure of annealed films. This residual porosity is interpreted as a result of self-diffusion healing of deeper fractures. The experimental results confirm that in CDF the surface enhancement has a ″classical ″ electromagnetic origin and is due to intercrystallite pores with sufficiently small values of the width/depth ratio. A simple theoretical model is proposed to estimate analytically the enhancement in structures such as deep narrow crevices. © 1990.
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页码：411 / 415
页数：5
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