Picosecond acoustics for the characterization of sub-micron polymeric films

被引:7
作者
Bretz, KC
Lee, YC
Krauss, TD
Wise, FW
Sachse, WH
机构
[1] CORNELL UNIV,DEPT APPL PHYS,ITHACA,NY 14853
[2] CORNELL UNIV,DEPT THEORET & APPL MECH,ITHACA,NY 14853
关键词
picosecond acoustics; thin polymer films; polymer characterization;
D O I
10.1016/0041-624X(96)00030-3
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
To characterize 5-50 nm poly(vinyl-2-pyridine) (PVP) films, we generate ultra-high frequency longitudinal acoustic waves (30-150 GHz) in Al using femtosecond laser pulses in a time delayed 'pump' and 'probe' beam configuration. For polymer him thicknesses of 12 nm we find an enhanced longitudinal wavespeed of 3858 m s(-1). The acoustic response from a PVP film with a thickness of 5 nm has been detected.
引用
收藏
页码:513 / 515
页数:3
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