Hi, I've already made a question and recently received a reply. My question is how does a microcantilever have a torsional resonant mode. We generally study a longitudinal mode, not so much considering the torsional mode. The man who replied to my question said "It's because of the material it is made from. Torsional modes can be induced in two ways. Firstly an asymmetric force or secondly a symmetric force on an crystalline structure which is asymmetric. " But I still have a difficulty in understanding that meaning. Can anyone describe it much easier?