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Journal of the Optical Society of America B

Resonant focusing in a planar microcavity

Hervé Rigneault, Serge Monneret, Christoph Ira Westbrook

Published Nov 1, 1998• 7 citations
Publisher

Abstract

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.

DOI
10.1364/josab.15.002712

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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.
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 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.
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.
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.
Small optical microresonators are structures which confine light to volumes with dimensions on the order of one wavelength and provide an important means for controlling light-matter interaction in integrated optics. In this Paper, we would like to present our work on the study of the interaction of single quantum emitters or nanoparticles located in the confined optical field of a single-mode microresonator. The interaction possibilities between a general photonic system and a quantum system are discussed, with special focus on the effect of resonant microcavities. For the case of the optical microresonator used in our experiments, we present a model based on the transfer matrix method which can analytically describe the radiative enhancement of even complex resonator geometries. This allows not only the optimization of resonator geometries, but gives accurate information on the radiative processes occurring in the cavity, allowing the extraction of information normally inaccessible in optical measurements.