Fractals in microcavities: Giant coupled, multiplicative enhancement of optical responses

Citation
W. Kim et al., Fractals in microcavities: Giant coupled, multiplicative enhancement of optical responses, PHYS REV L, 82(24), 1999, pp. 4811-4814
Citations number
18
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
82
Issue
24
Year of publication
1999
Pages
4811 - 4814
Database
ISI
SICI code
0031-9007(19990614)82:24<4811:FIMGCM>2.0.ZU;2-H
Abstract
A novel class of optical materials, microcavities doped with nanostructured fractal aggregates, was studied. Fractal aggregate optical excitations may be concentrated in regions smaller than the diffraction limit of conventio nal optics, resulting in large local fields. Seeding the aggregates into mi crocavities further increases the local fields because of light trapping by microcavity resonance modes. These microcomposites possess unique optical properties, including very large probabilities of radiative processes. In o ur experiments, lasing at extremely low pump intensities, below 1 mW, and s trongly enhanced Raman scattering was observed in fractal-microcavity-dye c omposites.