Optical microcavity

About: Optical microcavity is a research topic. Over the lifetime, 2599 publications have been published within this topic receiving 72125 citations. The topic is also known as: optical microcavities.

Photonic molecules doped with semiconductor nanocrystals

Abstract: We report on coherent cavity field coupling in linear chains and arrays of exactly size-matched spherical microcavities doped with $\mathrm{CdSe}$ quantum dots. The spatial distribution and the dominant polarization type of both the weakly and strongly coupled cavity resonances are studied spectrally and spatially resolved in various coupled resonator geometries. Both experiment and theory show strong photon mode coupling with pronounced mode splitting as well as weak coupling with no significant loss in $Q$-factor depending on the emitter position and orientation.

Organic electroluminescent device with plural microcavities

Abstract: An OED with a first microcavity including a first transparent spacer positioned adjacent the diode light output and a first mirror stack positioned on the first spacer to reflect light back into the OED and to define an optical length of the first microcavity. The optical length of the first microcavity being such that light emitted from the first microcavity has a first spectrum. A second microcavity including a second transparent spacer positioned adjacent the first microcavity and a second mirror stack positioned on the second spacer to reflect light toward the first microcavity and to define an optical length of the second microcavity. The optical length of the second microcavity being such that light emitted from the second microcavity has a second spectrum. Additional microcavities can be placed in the structure to further enhance and alter the light spectrum.

Scaling laws of the cavity enhancement for nitrogen-vacancy centers in diamond

Abstract: We employ a fiber-based optical microcavity with high finesse to study the enhancement of phonon sideband fluorescence of nitrogen-vacancy centers in nanodiamonds. Harnessing the full tunability and open access of the resonator, we explicitly demonstrate the scaling laws of the Purcell enhancement by varying both the mode volume and the quality factor over a large range. While changes in the emission lifetime remain small in the regime of a broadband emitter, we observe an increase of the emission spectral density by up to a factor of 300. This gives a direct measure of the Purcell factor that could be achieved with this resonator and an emitter whose linewidth is narrower than the cavity linewidth. Our results show a method for the realization of wavelength-tunable narrow-band single-photon sources and demonstrate a system that has the potential to reach the strong-coupling regime.

Bose–Einstein condensation of paraxial light

Abstract: Photons, due to the virtually vanishing photon–photon interaction, constitute to very good approximation an ideal Bose gas, but owing to the vanishing chemical potential a (free) photon gas does not show Bose–Einstein condensation. However, this is not necessarily true for a lower-dimensional photon gas. By means of a fluorescence induced thermalization process in an optical microcavity one can achieve a thermal photon gas with freely adjustable chemical potential. Experimentally, we have observed thermalization and subsequently Bose–Einstein condensation of the photon gas at room temperature. In this paper, we give a detailed description of the experiment, which is based on a dye-filled optical microcavity, acting as a white-wall box for photons. Thermalization is achieved in a photon number-conserving way by photon scattering off the dye molecules, and the cavity mirrors both provide an effective photon mass and a confining potential-key prerequisites for the Bose–Einstein condensation of photons. The experimental results are in good agreement with both a statistical and a simple rate equation model, describing the properties of the thermalized photon gas.

Optical excitation and probing of whispering gallery modes in bottle microresonators: potential for all-fiber add–drop filters

Abstract: We have investigated the optical excitation and probing of bottle microresonators experimentally, using fiber tapers. The channel-dropping characteristics of such devices are shown to depend on the excitation configuration. In addition, the axial leakage behavior of these microresonators is characterized.