To understand how these three ideas work together, it helps first to think about a lone nanoparticle made of some nonmagnetic material, its diameter a small fraction of an optical wavelength.

• 为了理解这三种想法是如何联系到一起的，可以先设想一个由非磁性材料制造的孤立的纳米微粒，其直径为光波波长的若干分之一。