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Spectral Hole-Burning and Related Spectroscopies: Science and Applications

Room Temperature Persistent Spectral Hole Burning using Dielectric Particles as Photonic Atoms

S. Arnold

Published Jan 1, 1991• 0 citations
Publisher

Abstract

Persistent spectral hole burning at room temperature has recently been demonstrated using a 2-D collection of fluorescent spherical microparticles having a random distribution of sizes.1 In this system, known as a Microparticle Hole Burning Medium(MHBM), the differences in the frequencies of Morphology Dependent Resonances(MDR) with size enables one to generate a fluorescence excitation spectrum which is heterogeneous.

DOI
10.1364/pshb.1991.fa1

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Persistent spectral hole burning at room temperature has recently been demonstrated using a 2-D collection of fluorescent spherical microparticles having a random distribution of sizes.1 In this system, known as a Microparticle Hole Burning Medium(MHBM), the differences in the frequencies of Morphology Dependent Resonances(MDR) with size enables one to generate a fluorescence excitation spectrum which is heterogeneous.
Persistent spectral hole burning with multiplicity was realized at room temperature for Nile blue molecules-doped polymeric dielectric spherical microparticles based on morphology-dependent resonances. Hole parameters depending on burning conditions were studied. Dynamical characteristic behavior of hole formation was measured and analyzed with a model based on rate equations. The effective hole formation rate was obtained by simulation. Photophysical and photochemical mechanisms of the room temperature hole burning for this system was discussed.
Recently, photonic atoms (dielectric microspheres) have enjoyed the attention of the optical spectroscopy community. A variety of linear and nonlinear optical processes have been observed in liquid microdroplets. But solid state photonic devices using these properties are scarce. A first of these applications is the room temperature microparticle hole-burning memory. New applications can be envisioned if microparticle resonances can be coupled to traveling waves in optical fibers. In this paper we demonstrate the excitation of narrow morphology dependent resonances of microparticles placed on an optical fiber. Furthermore we reveal a model for this process which describes the coupling efficiency in terms of the geometrical and material properties of the microparticle-fiber system.
For next generation high density optical storage, extensive studies on persistent spectral hole burning (PSHB) have been performed, because they have a large potential for a high density frequency-domain optical data storage. PSHB has been observed at room temperature in Sm-doped crystals and glasses. Among them, glasses are considered to be more favorable than single crystals, due to their wide inhomogeneous line width and easy process for mass production. In the study, we developed a new glass mixture which shows room temperature PSHB with a inhomogeneous line width broadened up to 70 cm/sup -1/. The PSHB was characterized by investigating the time decay pattern of fluorescence and the excitation spectra.
Efforts to create materials in which to burn holes at higher temperatures face an inherent contradiction: the need for inhomogeneous line broadening from host-guest interactions, vs. the desire to limit the homogeneous line broadening from thermal fluctuations of host-guest interactions (i.e. phonon broadening). A different approach to the question of how to burn holes at high temperatures was recently conceived and experimentally confirmed.1 This approach relies on using distributions of chromophore-doped optical cavities as the hole burning medium. The effect was recently observed in dye-doped micro-spheres. As a simple model illustrating the important effects characteristic to these Mie theory cavity resonances in spheres, the Fabry-Perot is treated analytically and numerically in this work.