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Japanese Journal of Applied Physics

Reflection-Induced Light Correlation in Spontaneous Emission in Front of a Mirror

Hiroshi Taniguchi, Hiroshi Yamada, Tamiya Fujiwara, Hiroto Ito, Shinji Tanosaki, Mamoru Baba

Published Aug 1, 1993• 1 citation
Publisher

Abstract

It is shown that fluorescence spectra from a dye-doped polymer film in front of a mirror exhibit angular and spectral localization effects caused by self-interference in the spontaneous emission. Spectral results obtained experimentally, which are dependent on film thickness, are found to be in good agreement with the calculated results predicted by a semiclassical description.

DOI
10.1143/jjap.32.3457

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It is shown that fluorescence spectra from a dye-doped polymer film in front of a mirror exhibit angular and spectral localization effects caused by self-interference in the spontaneous emission. Spectral results obtained experimentally, which are dependent on film thickness, are found to be in good agreement with the calculated results predicted by a semiclassical description.
Fluorescence lifetimes of thin, rhodamine 6G-doped polymer layers in front of a mirror have been determined as a function of the emitter-mirror separation and the conditions of excitation and observation. Lifetime is well known to depend on the spatial emitter-mirror separation. The explanation of experimental data needs to consider direction, polarization, and numerical aperture of the experimental system. As predicted theoretically, experimental results depend on the conditions of illumination and observation, because of the different lifetimes of emitters aligned horizontally or vertically with respect to the plane of interfaces and their selection by the experimental system. This effect is not observable when ions are used as a source of fluorescence, because ensemble averaging depends on the properties of sources.
We discuss, from a classical as well as a quantum-mechanical point of view, the effect of the coupling of an excited two-level system with itself due to emission and absorption of electric-dipole radiation, the emitted radiation being reflected by a nearby mirror. Expressions familiar from resonance-scattering theory are found for the shift of the transition frequency and linewidth from their values in the absence of the mirror. This renormalization effect leads to spatial modulation in the transition frequency and width of the excited state due to its resonant interaction with itself via the radiation field reflected from the mirror. This formalism is applied to some recent experiments with monomolecular dye layers. The experimental values of the fluorescence lifetime are in good agreement with the theory for distances from 500 to 6000 \AA{}.