刻在聚合物薄膜上的全息光栅拉曼成像

Raman image from a thin film of azobenzene-containing polymer thin film (300 nm) that is periodically structured (periodicity of ~1 μm).

A Raman spectrum was recorded every 100 nm along the X and Y directions with an integration time of 5 seconds per spectrum (λ excitation=752.4 nm). The variation of the Raman signal was integrated over the [1060-1180]cm-1 spectral domain. Details on the Raman profile are obtained with a spatial resolution better than λ/2 (at the diffraction limit).

图1给出了具有周期性结构（周期约1mm）表面修饰偶氮苯的聚合物薄膜（300 nm）的拉曼成像图。

使用Labram HR 800（HORIBA JobinYvon）光谱仪、倒置显微镜（Olympus IX 71）和X、Y压电平台进行拉曼测量，以获得最佳精度和高重复性的样品样品。配合使用100倍，NA值为0.9的显微镜物镜。

沿X和Y方向每隔100 nm采集一个拉曼光谱，单个光谱的积分时间为5秒（激发波长为752.4 nm）。对1060到1180cm^-1段光谱进行积分。必须强调的是，拉曼成像细节是以优于λ/2（在衍射极限下）的空间分辨率获得的。