炫酷科技：tiny built in laser light up living cell

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They may sound like weapons for Ant-Man’s next nemesis, but the microscopic lasers could greatly improve biologists’ ability to
track the movement of individual cells—a possible boon to fields ranging from developmental biology to cancer research.
这篇文章主要是讲制造细胞大小的激光器。它的优势是非常明显的，可以比fluorescence和radio frequency ID更好。

不过要制造一台激光器，就需要有两个条件：

1. 能够受到激发而产生光的材料，一般是指晶体
2. 一个共振腔

难点在于如何在细胞里装进一个容器
以下尝试：

1. In culture, they mixed cells with tiny plastic spheres 5 to 10 micrometers in diameter that had been “doped” with a fluorescent dye. The beads served as the cavities, the dye as the medium.
2. get cells to take up plastic beads, and they created two other kinds of resonating spheres as well

那这么做的目的在于什么呢？

1. 追踪细胞的运动，每一个细胞的塑料球都是有一点不同，这样他们的激发出来的激光就会有一点波长上的区别。这样就可以分开每个细胞了。
2. 每种tissue会吸收不同的beads，那么相比于fluorescence，则有着更大的优势。可以定位millions of cells

难点，更小的beads，更好的吸收。