近晶A相液晶从均匀的各向同性相中萌生时,其平直界面失稳后选择具有正弦周期的界面模式作为演化路径.采用偏振光成像的方法测量了几种液晶界面失稳后所选模式的周期.把界面模式作为变量,以模式的能量泛函积分为作用量,构建模式选择的唯象模型,通过数值计算在全域内找到使作用量最小的波数,这个波数可反映近晶A相液晶界面失稳后实际选择的界面模式的特征.
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