TY - JOUR AB - Microresonators containing quantum dots find application in devices like single photon emitters for quantum information technology as well as low threshold laser devices. We demonstrate the fabrication of 60 nm thin zinc-blende AlN microdisks including cubic GaN quantum dots using dry chemical etching techniques. Scanning electron microscopy analysis reveals the morphology with smooth surfaces of the microdisks. Micro-photoluminescence measurements exhibit optically active quantum dots. Furthermore this is the first report of resonator modes in the emission spectrum of a cubic AlN microdisk. AU - Bürger, M. AU - Kemper, R.M. AU - Bader, C.A. AU - Ruth, M. AU - Declair, S. AU - Meier, Cedrik AU - Förstner, Jens AU - As, D.J. ID - 3959 JF - Journal of Crystal Growth KW - tet_topic_qd KW - tet_topic_microdisk SN - 0022-0248 TI - Cubic GaN quantum dots embedded in zinc-blende AlN microdisks VL - 378 ER - TY - JOUR AB - Whispering gallery modes (WGMs) were observed in 60 nm thin cubic AlN microdisk resonators containing a single layer of non-polar cubic GaN quantum dots. Freestanding microdisks were patterned by means of electron beam lithography and a two step reactive ion etching process. Micro-photoluminescence spectroscopy investigations were performed for optical characterization. We analyzed the mode spacing for disk diameters ranging from 2-4 lm. Numerical investigations using three dimensional finite difference time domain calculations were in good agreement with the experimental data. Whispering gallery modes of the radial orders 1 and 2 were identified by means of simulated mode field distributions. AU - Bürger, M. AU - Ruth, M. AU - Declair, S. AU - Förstner, Jens AU - Meier, Cedrik AU - As, Donat Josef ID - 3963 IS - 8 JF - Applied Physics Letters KW - tet_topic_qd KW - tet_topic_microdisk SN - 0003-6951 TI - Whispering gallery modes in zinc-blende AlN microdisks containing non-polar GaN quantum dots VL - 102 ER - TY - JOUR AB - We numerically investigate the coupling between circular resonators and study strong light‐matter coupling of single as well as multiple circular resonators to quantum‐mechanical resonators in two dimensional model simulations. For all cases, the computed resonances of the coupled system as function of the detuning show anti‐crossings. The obtained mode splittings of coupled optical resonators are strongly depending on distance and cluster in almost degenerate eigenstates for large distances, as is known from coupled resonator optical waveguides. Vacuum Rabi splitting is observed for a quantum dot strongly coupled to eigenmodes of single perfectly cylindrical resonators. AU - Declair, S. AU - Meier, Torsten AU - Förstner, Jens ID - 4118 IS - 4 JF - physica status solidi (c) KW - tet_topic_phc KW - tet_topic_microdisk SN - 1862-6351 TI - Numerical investigation of the coupling between microdisk modes and quantum dots VL - 8 ER - TY - JOUR AB - We numerically investigate the behavior of Whispering Gallery Modes (WGMs) in circularly shaped resonators like microdisks, with diameters in the range of optical vacuum wavelengths. The microdisk is embedded in an uniaxial anisotropic dielectric environment. By changing the optical anisotropy, one obtains spectral tunability of the optical modes. The degree of tunability strongly depends on the radial (azimuthal) mode order M (N). As the modes approach each other spectrally, anticrossing is observed, leading to a rearrangement of the optical states. AU - Declair, S. AU - Meier, Cedrik AU - Meier, Torsten AU - Förstner, Jens ID - 4125 IS - 4 JF - Photonics and Nanostructures - Fundamentals and Applications KW - tet_topic_microdisk SN - 1569-4410 TI - Anticrossing of Whispering Gallery Modes in microdisk resonators embedded in an anisotropic environment VL - 8 ER - TY - JOUR AB - GaAs-based semiconductor microdisks with high quality whispering gallery modes (Q44000) have been fabricated.A layer of self-organized InAs quantumdots (QDs) served as a light source to feed the optical modes at room temperature. In order to achieve frequency tuning of the optical modes, the microdisk devices have been immersed in 4 – cyano – 4´-pentylbiphenyl (5CB), a liquid crystal(LC) with a nematic phase below the clearing temperature of TC≈34°C .We have studied the device performance in the temperature rangeof T=20-50°C, in order to investigate the influence of the nematic–isotropic phase transition on the optical modes. Moreover,we havea pplied an AC electric field to the device,which leads in the nematic phase to a reorientation of the anisotropic dielectric tensor of the liquid crystal.This electrical anisotropy can be used to achieve electrical tunability of the optical modes.Using the finite-difference time domain (FDTD) technique with an anisotropic material model, we are able to describe the influence of the liquid crystal qualitatively. AU - Piegdon, Karoline A. AU - Offer, Matthias AU - Lorke, Axel AU - Urbanski, Martin AU - Hoischen, Andreas AU - Kitzerow, Heinz-Siegfried AU - Declair, Stefan AU - Förstner, Jens AU - Meier, Torsten AU - Reuter, Dirk AU - Wieck, Andreas D. AU - Meier, Cedrik ID - 4123 IS - 10 JF - Physica E: Low-dimensional Systems and Nanostructures KW - tet_topic_qd KW - tet_topic_microdisk SN - 1386-9477 TI - Self-assembled quantum dots in a liquid-crystal-tunable microdisk resonator VL - 42 ER - TY - JOUR AB - Microdisks made from GaAs with embedded InAs quantum dots are immersed in the liquid crystal 4-cyano-4’-pentylbiphenyl (5CB). The quantum dots serve as emitters feeding the optical modes of the photonic cavity. By changing temperature, the liquid crystal undergoes a phase transition from the isotropic to the nematic state, which can be used as an effective tuning mechanism of the photonic modes of the cavity. In the nematic state, the uniaxial electrical anisotropy of the liquid crystal molecules can be exploited for orienting the material in an electric field, thus externally controlling the birefringence of the material. Using this effect, an electric field induced tuning of the modes is achieved. Numerical simulations using the finite-differences time-domain (FDTD) technique employing an anisotropic dielectric medium allow to understand the alignment of the liquid crystal molecules on the surface of the microdisk resonator. AU - Piegdon, Karoline A. AU - Declair, Stefan AU - Förstner, Jens AU - Meier, Torsten AU - Matthias, Heiner AU - Urbanski, Martin AU - Kitzerow, Heinz-Siegfried AU - Reuter, Dirk AU - Wieck, Andreas D. AU - Lorke, Axel AU - Meier, Cedrik ID - 4172 IS - 8 JF - Optics Express KW - tet_topic_qd KW - tet_topic_microdisk SN - 1094-4087 TI - Tuning quantum-dot based photonic devices with liquid crystals VL - 18 ER - TY - CONF AB - We experimentally and theoretically investigate microdisk resonators with embedded quantum dots immersed in a liquid crystal in its nematic phase, showing the tunabililty of the photonic modes via external parameters like temperature or electric field. AU - Förstner, Jens AU - Meier, Cedrik AU - Piegdon, Karoline AU - Declair, Stefan AU - Hoischen, Andreas AU - Urbanski, Mark AU - Meier, Torsten AU - Kitzerow, Heinz-Siegfried ID - 4181 KW - tet_topic_microdisk SN - 9781557528735 T2 - Advances in Optical Sciences Congress TI - Coupling Dynamics of Quantum Dots in a Liquid-Crystal-Tunable Microdisk Resonator ER - TY - CONF AB - We numerically investigate Whispering Gallery Modes (WGM) in a subwavelength microdisk resonator [1] embedded in an uniaxial anisotropic liquid crystal environment. It is shown that the WGMs have anticrossing behavior when modes of different radial mode order M or azimuthal order N approach each other spectrally. AU - Förstner, Jens AU - Declair, S. AU - Meier, Cedrik AU - Meier, Torsten ID - 4179 IS - 1 KW - tet_topic_microdisk T2 - Theoretical and Computational Nanophotonics Tacona-Photonics TI - Anticrossing of Whispering Gallery Modes in Microdisk Resonators Embedded in a Liquid Crystal VL - 1176 ER -