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.

Polarization entanglement visibility of photon pairs emitted by a quantum dot embedded in a microcavity

Abstract: We study the photon emission from a quantum dot embedded in a microcavity. Incoherent pumping of its excitons and biexciton provokes the emission of leaky and cavity modes. By solving a master equation we obtain the correlation functions required to compute the spectrum and the relative efficiency among the emission of pairs and single photons. A quantum regime appears for low pumping and large rate of emission. By means of a post-selection process, a two beams experiment with different linear polarizations could be performed producing a large polarization entanglement visibility precisely in the quantum regime.

Theoretical Study of Tunable Optical Resonators in Periodic and Quasiperiodic One-Dimensional Photonic Structures Incorporating a Nematic Liquid Crystal

Abstract: In this work, the transfer matrix method (TMM) is employed to investigate the optical properties of one-dimensional periodic and quasiperiodic photonic crystals containing nematic liquid crystal (NLC) layers. This structure is expressed as (ABC)J(CBA)J and made of alternated layers of isotropic dielectrics SiO2 (A), BGO (B) and nematic liquid crystal (C). The simulation study shows that the proposed ternary configuration exhibits tunable defect mode within the photonic band gap (PBG) that can be manipulated by adjusting the thicknesses of NLC layers in order of the periodic lattice. In addition, the optimized structure permits for strong confinement light giving rise to an optical microcavity. The application of an applied voltage into NLC layers enables improving the sensitivity by guiding the local defect mode. It has been also shown that by applying quasiperiodic inflation according to Rudin Shapiro Sequence (RSS) scheme to main periodic structure, several tunable resonant modes appear within the PBG. The presence of such sharp resonant peaks reflects that the quasiperiodic NLC-based structure behaves like multiple microcavites with strong light-matter coupling.

Lasing threshold behavior of microcavities: Observation by polarization and spectroscopic measurements.

Abstract: We propose and demonstrate the use of polarization to determine the threshold of an optical microcavity when the output power versus pump power does not show a sharp threshold. A lasing threshold is observed via a sharp transition in the polarization and a simultaneous reduction in emission linewidth. We find that dipole angular diffusion in a dye gain medium has a significant effect on the polarization of the emission. A theoretical model including the diffusion process is presented. Quantitative agreement with the measurements is obtained.

Multimode laser emission from laterally confined organic microcavities

Abstract: Room-temperature multimode laser emission is observed in a microcavity consisting of dielectric mirrors and small-molecular-weight organic photonic dots as a cavity layer. The structure shows simultaneous lasing of a wide variety of transverse modes. A comparison of the laser operating characteristics with those of unpatterned structures shows an enhancement in the spontaneous emission coupling factor by more than two orders of magnitude due to the lateral confinement. The spectral features are in quantitative agreement with calculations of quantized photonic states in three-dimensional optical cavities.

Vertical microcavity surface‐emitting ring laser

Abstract: We report the performance of a novel surface‐emitting laser of ring structure (RSEL). The far‐field emission pattern of the RSEL remains a near‐diffraction limited single lobe at 3 times the threshold current level. The structure may also be used to achieve beam width much less than that of the diffraction limit of Gaussian near‐field distribution.