Whispering gallery mode microdisk cavities fabricated by direct laser writing are studied using dark-field imaging and spectroscopy in the visible spectral range. Dark-field imaging allows us to directly visualize the spatial intensity distribution of whispering gallery modes. We extract their azimuthal and radial mode indices from dark-field images, and find the axial mode number from the disp...

Optical fiber taper waveguides are used to improve the efficiency of room temperature photoluminescence measurements of AlGaAs microdisk resonant cavities with embedded self-assembled InAs quantum dots. As a near-field collection optic, the fiber taper improves the collection efficiency from microdisk lasers by a factor of 15–100 times in comparison to conventional normal incidence free-space c...

Diamond nanocrystals containing NV color centers are positioned with 100-nanometer-scale accuracy in the near-field of a high-Q SiO(2) microdisk cavity using a fiber taper. The cavity modified nanocrystal photoluminescence is studied, with Fano-like quantum interference features observed in the far-field emission spectrum. A quantum optical model of the system is proposed and fit to the measure...

We show that a novel material InNAsP grown on InP is superior for long-wavelength microdisk lasers (and so expected for edge-emitting lasers) because of its larger conduction band offset from the addition of a small amount of nitrogen (0.5%–1%). The maximum temperature of operation for an InNAsP–GaInAsP microdisk laser is 70 C, which is about 120 C higher than that of a similar laser fabricated...

A model for quantitative analysis of microdisk laser emission spectra is presented. Conformal mapping is used to determine radial and azimuthal eigenvalues, eigenvectors, and cavity Q corresponding to leaky optical resonances in an optically transparent dielectric disk. The effects of gain and loss in a microcavity active medium are also included in the model. Our results compare well with expe...

A quantum master equation model for the interaction between a two-level system and whispering-gallery modes WGMs of a microdisk cavity is presented, with specific attention paid to current experiments involving a semiconductor quantum dot QD embedded in a fiber-coupled AlxGa1−xAs microdisk cavity. In standard single mode cavity QED, three important rates characterize the system: the QD-cavity c...

We conducted a thorough experimental and numerical study of the micromagnetic properties Permalloy (Ni$_{80}$Fe$_{20}$) microdisks exhibiting target domain structures at remanence. Vortex configurations are quite common in such correspond to an in-plane flux closure configuration cylindrical symmetry with out-of-plane magnetized core. In contrast, observed thicker characterized by vortex compon...