Room Temperature Microparticle based Persistent Spectral Hole Burning Memory
S. Arnold, C.T. Liu, W.B. Whitten and J.M. Ramsey
Opt. Lett. 16, 420-422(1991)

We show both theoretically and experimentally that a random distribution of spherical microparticles may be used as a spectral hole burning memory. This microparticle hole burning memory, which can be both written and read at room temperature, is direct consequence of the properties of morphology-dependent resonances of microparticles.