We observe a room-temperature low-threshold transition to coherent polariton state in bulk GaN microcavities the strong-coupling regime. Nonresonant pulsed optical pumping produces rapid thermalization and yields clear emission threshold of 1 mW, corresponding an absorbed energy density $29\text{ }\text{ }\ensuremath{\mu}\mathrm{J}\text{ }{\mathrm{cm}}^{\ensuremath{-}2}$, order magnitude smaller than best optically pumped (In,Ga)N quantum-well surface-emitting lasers (VCSELs). Angular...

Conventional surface plasmons have a wave vector exceeding that of light in vacuum, and therefore cannot be directly excited by is simply incident on the surface. However, we propose plasmon-polariton state can formed at boundary between metal dielectric Bragg mirror zero in-plane produced direct optical excitation. In analogy with electronic states crystal proposed Tamm, call these excitations Tamm plasmons, predict they may exist both TE TM polarizations are characterized parabolic...

We report on the first experimental observation of Tamm plasmon polaritons (TPPs) formed at interface between a metal and dielectric Bragg reflector (DBR). In contrast to conventional surface plasmons, TPPs have an in-plane wavevector less than light in vacuum, which allows for their direct optical excitation. The angular resolved reflectivity transmission spectra GaAs∕AlAs DBR covered by Au films various thicknesses show resonances associated with TPP low temperatures room temperature....

A remarkable analogy is established between the well-known spin Hall effect and polarization dependence of Rayleigh scattering light in microcavities. This results from strong elastic exciton polaritons: if initial polariton state has a zero characterized by some linear polarization, scattered polaritons become strongly polarized. The can be positive or negative dependent on orientation direction scattering. Very surprisingly, polarizations clockwise anticlockwise have different signs....

Wannier-Mott excitons in the wurzite-type semiconductor material ZnO are stable at room temperature, have an extremely large oscillator strength, and emit blue light. This makes excellent potential candidate for fabrication of room-temperature lasers where coherent light amplification is ruled by fascinating mechanism Bose condensation exciton polaritons. We report direct optical measurement strength f ZnO. The longitudinal transverse splitting resonances ${\ensuremath{\Gamma}}_{5}(B)$...

Quantum Division The notion of quantum mechanics is that variables are expressed as integer values. In fluids, for instance, vortices quantized in terms the polarization and phase shifts observed multiples 2π, is, full rotations each variable around vortex core. Theoretical work has predicted some instances there should be half-quantum vortices, where circumventing core characterized by just π polarization. By observing exciton-polariton condensates Lagoudakis et al. (p. 974 ) present...

Tamm states of light are lossless interface modes decaying exponentially in the surrounding media. We show that they can be formed at boundary between two periodical dielectric structures, one having a period close to wavelength and another double wavelength. The order layers has crucial effect on states. in-plane dispersion these is parabolic with effective masses slightly different for TE TM polarizations, both ${10}^{\ensuremath{-}5}$ free electron mass.

By exploiting the polarization multistability of polaritons, we show that polarized signals can be conducted in plane a semiconductor microcavity along controlled channels or "neurons." Furthermore, because interaction polaritons with opposite spins it is possible to realize binary logic gates operating on degree freedom. Multiple integrated together form an optical circuit contained single microcavity.

Abstract Solid-state cavity quantum electrodynamics is a rapidly advancing field, which explores the frontiers of light–matter coupling. Metal-based approaches are particular interest in this as they carry potential to squeeze optical modes spaces significantly below diffraction limit. Transition metal dichalcogenides ideally suited active material electrodynamics, interact strongly with light at ultimate monolayer Here, we implement Tamm-plasmon-polariton structure and study coupling WSe 2...

A comprehensive theoretical and experimental study of linear exciton-light coupling in single coupled semiconductor microcavities is presented: emphasis given to angular dispersion polarization effects the strong-coupling regime. The phase delay dielectric mirrors carries a nontrivial angle dependence. splitting cavity modes increases with internal as ${\mathrm{sin}}^{2}{\ensuremath{\theta}}_{\mathrm{eff}}.$ Comparison results on GaAs-based...

From a theoretical point of view, we discuss variety phenomena linked to the spin and polarization degree freedom exciton-polaritons in semiconductor microcavities. We start with linear optical effects including Hall effect, formation vortices ballistic propagation polarized exciton-polaritons. Next, interplay between spin-dependent dynamics Bose condensation 2D system microcavity polaritons is addressed. Theoretically, this many-body interacting particles described by spinor...

We observe the buildup of strong ($\ensuremath{\sim}50%$) spontaneous vector polarization in emission from a GaN-based polariton laser excited by short optical pulses at room temperature. The Stokes emitted light changes its orientation randomly one excitation pulse to another, so that time-integrated remains zero. This behavior is completely different any previous laser. interpret this observation terms symmetry breaking Bose-Einstein condensate exciton polaritons.

The critical temperature for Bose condensation of exciton polaritons in an AlGaN microcavity containing 9 GaN quantum wells is calculated to be T=460 K. We have modeled the kinetics such a device using two-dimensional Boltzmann equation. Room-temperature lasing found with threshold as small 100 mW. kinetic blocking polariton relaxation that prevents formation Bose-condensed phase at low temperatures disappears high temperatures, especially n-doped samples. Thus, microcavities are excellent...

Resonant transmission of light through a microcavity in the strong coupling regime is used to estimate strength interaction between polaritons with parallel $({\ensuremath{\alpha}}_{1})$ or antiparallel $({\ensuremath{\alpha}}_{2})$ spins. The ratio ${\ensuremath{\alpha}}_{2}/{\ensuremath{\alpha}}_{1}$ found be strongly dependent on detuning exciton and photon modes. From negative zero it changes from about 0 less than $\ensuremath{-}1$. Our observations indicate that at certain conditions...

New effects of polarization multistability and hysteresis in a coherently driven polariton system semiconductor microcavity are predicted theoretically analyzed. The arises due to polarization-dependent polariton-polariton interactions can be revealed resolved photoluminescence experiments. pumping power required observe this effect is 4 orders magnitude lower than the characteristic conventional bistable optical systems.

Mie resonances due to scattering or absorption of light in InN-containing clusters metallic In may have been erroneously interpreted as the infrared band gap tens papers. Here we show by direct thermally detected optical measurements that true InN is markedly wider than currently accepted 0.7 eV. Microcathodoluminescence studies complemented imaging shown bright emission at 0.7--0.8 eV arises a close vicinity inclusions and likely associated with surface states metal$/$InN interfaces.

The relaxation bottleneck present in the dispersion relation of exciton polaritons semiconductor microcavities has prevented realization low threshold lasing based on exciton-polariton condensation. Here we show theoretically that introduction a cold electron gas into such structures induces efficient electron-polariton scattering. This process allows condensation accumulated at to final emitting state with transition time few picoseconds, opening way new generation low-threshold...

We revisit the exciton mechanism of superconductivity in framework microcavity physics, replacing virtual excitons as a binding agent Cooper pairs by excitations an exciton-polariton Bose-Einstein condensate. consider model where quantum well with two-dimensional electron gas is sandwiched between two undoped wells, polariton condensate formed. show that critical temperature for dramatically increases population, opening new route towards high-temperature superconductivity.