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Journal of the Optical Society of America B

Spontaneous emission properties of Pr ions located in planar dielectric microcavities

S. Robert, Hervé Rigneault, Frédéric Lamarque

Published Jun 1, 1998• 27 citations
Publisher

Abstract

Spontaneous emission control around 490 nm for praseodymium ions implanted inside planar dielectric structures, such as microcavities, is investigated and compared with a theory. Using an Ar+ laser at 457.9 nm as the pump beam, we demonstrate the existence of an optimal pumping angle. Furthermore, we obtain enhanced and directive radiation patterns for the wavelength at which the cavities are tuned (490 nm) and underline very wavelength-dependent behavior of the patterns. In any case, good agreement is obtained between experiment and theory when we take the intrinsic Pr spectrum of emission into account independently of the structures’ influence.

DOI
10.1364/josab.15.001773

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Spontaneous emission control around 490 nm for praseodymium ions implanted inside planar dielectric structures, such as microcavities, is investigated and compared with a theory. Using an Ar+ laser at 457.9 nm as the pump beam, we demonstrate the existence of an optimal pumping angle. Furthermore, we obtain enhanced and directive radiation patterns for the wavelength at which the cavities are tuned (490 nm) and underline very wavelength-dependent behavior of the patterns. In any case, good agreement is obtained between experiment and theory when we take the intrinsic Pr spectrum of emission into account independently of the structures’ influence.
We investigate theoretically and experimentally the optical properties of planar Ta2O5/SiO2 multilayer structures implanted with rare earth ions such as erbium and praseodymium. We demonstrate that the spontaneous emission can be strongly enhanced in a direction normal to the layers if the luminescent ions are located in the spacer of a resonant Fabry-Perot type microcavity. Nevertheless, we show that a large amount of light is emitted into the guided modes of the planar stack reducing the optical confinement which is likely to be reached within this type of dielectric microcavities.
Spontaneous emission control for luminescent species located inside multilayer dielectric thin films is investigated theoretically in the framework of classical and quantum electrodynamics. Theory is compared to experimental results concerning rare earth ions implanted inside Ta2O5/SiO2 microcavities. We show that although the planar cavities can control the radiation pattern of sources, these structures are unable to affect significantly the atomic lifetime. The first attempts to etch 3D microcavities are presented.
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We study the focusing of a Gaussian laser beam in a microscopic planar cavity when the laser wavelength is resonant in the cavity but the beam divergence is larger than the acceptance angle of the cavity. Using the luminescence of implanted praseodymium ions as a microscopic probe for the total electric field inside the spacer of the microresonator, we investigate theoretically and experimentally how strong focusing alters the photoexcitation of luminescent species located inside such a structure.
A complete set of cavity modes in planar dielectric microcavities is presented which naturally includes guided modes. We show that most of these orthonormal fields can be derived from a coherent superposition of plane waves incoming on the stack from the air and from the substrate. Spontaneous emission of a dipole located inside the microcavity is analyzed, in terms of cavity modes. Derivation of the radiation pattern in the air and in the substrate is presented. The power emitted into the guided modes is also determined. Finally, a numerical analysis of the radiative properties of an erbium atom located in a Fabry-P\'erot multilayer dielectric microcavity is investigated. We show that a large amount of light is emitted into the guided modes of the structure, in spite of the Fabry-P\'erot resonance, which increases the spontaneous emission rate in a normal direction. \textcopyright{} 1996 The American Physical Society.
Spontaneous emission of erbium atoms implanted in various planar multidielectric stacks is investigated. Computational and experimental analyses are performed so as to assess the amount of light leaking into the radiative and the guided modes of the structures. The key point is the demonstration of the dominant emission into the guided modes, even though the atoms are implanted in the spacer of a resonant microcavity structure. The result is of practical interest since it challenges the conventional idea about the electromagnetic confinement, which is likely to be reached within planar microcavities.