Control of Spontanous Emission from Quantum Emitters Using Hyperbolic Metamaterial Substrates

Hyperbolic metamaterials (HMMs) are so named for possessing a hyperboloid-shaped dispersion which gives rise to a large photonic density of states. Quantum emitters placed inside or in the near-field of a HMM have been shown to exhibit strong enhancement of spontaneous emission due to the increase in available states. This thesis focuses on enhancing spontaneous emission of quantum emitters in optical frequencies by utilizing multilayered metal/dielectric composites that form these highly anisotropic metamaterials. In conjunction with the enhanced decay rate we experimentally demonstrate two methods for shaping and directing radiation trapped in the HMM into free space by employing a new class of artificial photonic media which we term a photonic hypercrystal. The ability to significantly enhance the spontaneous emission rate and control the directionality paves the way to practical applications using hyperbolic metamaterials such as sub-wavelength lasers, single-photon sources, and ultrafast light emitting diodes

Strong light-matter coupling in two-dimensional atomic crystals

Two dimensional (2D) atomic crystals of graphene, and transition metal dichalcogenides have emerged as a class of materials that show strong light-matter interaction. This interaction can be further controlled by embedding such materials into optical microcavities. When the interaction is engineered to be stronger than the dissipation of light and matter entities, one approaches the strong coupling regime resulting in the formation of half-light half-matter bosonic quasiparticles called microcavity polaritons. Here we report the evidence of strong light-matter coupling and formation of microcavity polaritons in a two dimensional atomic crystal of molybdenum disulphide (MoS2) embedded inside a dielectric microcavity at room temperature. A Rabi splitting of 46 meV and highly directional emission is observed from the MoS2 microcavity owing to the coupling between the 2D excitons and the cavity photons. Realizing strong coupling effects at room temperature in a disorder free potential landscape is central to the development of practical polaritonic circuits and switches.Comment: 25 pages, 7 figure

Boletín de Segovia: Número 84 - 1884 julio 11

Copia digital. Madrid : Ministerio de Cultura. Subdirección General de Coordinación Bibliotecaria, 200

Visualization 2: Preferential emission into epsilon-near-zero metamaterial [Invited]

S4 - emission wavelength scan of vertical dipole above MM Originally published in Optical Materials Express on 01 December 2015 (ome-5-12-2878

Visualization 1: Preferential emission into epsilon-near-zero metamaterial [Invited]

S3 - emission wavelength scan of horizontal dipole above MM Originally published in Optical Materials Express on 01 December 2015 (ome-5-12-2878