Microlasers are Aarved from Sol-gel Films Deposited on Silicon (IMAGE)
Caption
Arrays of microlasers (left) are carved from sol-gel silica films on silicon wafers by photolithography, etching and reflowing steps. When light is coupled into a microlaser through a whisker-thin optical fiber (right) rare-earth atoms (in this case erbium), excited by the pump light, begin to fluoresce (right). Because some of the light penetrates the glass, the laser modes are perturbed by particles that land on the ring.
Credit
J. Zhu, L. He, S.K. Ozdemir, and L. Yang/ WUSTL
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