Energy-lose induced unidirectional light propagation were found in porous alumina based photonic crystal heterostructures. The reflected colors of the sample on the front and back sides illuminations are quite different, however, the transmitted colors have no obvious difference. This kind of unidirectional light propagation can be modulated over the whole visible light region by adjusting the combination of different photonic bandgap as well as the view angle.

The threshold gain of a quasi-static spaser depends only on the dielectric functions of the metal and gain material, while the nanoparticle shape or spasing mode define the resonant wavelength. The figure illustrates this on the example of silver shells embedded in gain material, and shows how the threshold gain increases for finite-sized structures with retardation due to radiative losses.

Schematic of the state space of an N-qubit system. The space is subdivided into N separability classes , (genuinely multipartite entangled), (biseparable), (fully separable). Buchholz et al. have exactly obtained the entanglement measure for a specific family of symmetric states. The geometric entanglement is the geometric distance of the state ρ from the set of k-separable states.

α,ω-Dithiols with reactive terminal thiol groups (HS-R-SH) can be used as a glue between metallic entities. This has been used to measure molecular conductance, create nano-spacers of interest in plasmonics, and build complex metal organic structures, including doped graphene type films. This report discusses key questions regarding protocols of making optimal dithiol metal structures and then describes their build by self assembly and lithography, their chemical composition and functional properties.

A physical interpretation for the room-temperature luminescence decay of colloidal quantum dots using the Kohlrausch relaxation function is proposed. The kinetics of the decay is determined by Förster-type dipole-dipole energy transfer from the quantum dots to anharmonic –CH vibrations of the capping molecules. Evidence for the role of the –CH anharmonic vibrations as photoexcitation energy acceptors is presented and their random distribution explained by the conformational freedom of alkyl chains.

We present an analytical approach to evaluate the geometric measure of multiparticle entanglement for mixed quantum states. Our method allows the computation of this measure for a family of multiparticle states with a certain symmetry and delivers lower bounds on the measure for general states. It works for an arbitrary number of particles, for arbitrary classes of multiparticle entanglement, and can also be used to determine other entanglement measures.

Energy-lose induced unidirectional light propagation were found in porous alumina based photonic crystal heterostructures. The reflected colors of the sample on the front and back sides illuminations are quite different, however, the transmitted colors have no obvious difference. This kind of unidirectional light propagation can be modulated over the whole visible light region by adjusting the combination of different photonic bandgap as well as the view angle.

The threshold of a spaser is analyzed electrodynamically. Quasi-static threshold gain depends only on the dielectric functions of the metal and gain material. Nanoparticle shape, composition, or spasing mode define only the resonant wavelength, which can be tuned to the spectral minimum of the gain. Retardation increases the threshold gain via radiative losses, as quantified using examples of silver spheroids and spherical shells embedded into gain material.

In modern Kaluza-Klein theories which successfully unify gravity, electromagnetism and a scalar field, null geodesics in five dimensions lead to simplified expressions for phase shifts in four-dimensional spacetime. It might be possible to test for an extra dimension by experiments such as those where neutron interferometry is used to measure the Aharonov-Bohm effect.

We present a microcavity phonon-polariton system that is derived from coupling cavity-confined mid-IR photons to the vibronic transition of an organic material. In particular, to achieve strong phonon-photon coupling, we coupled the carbonyl stretch vibrational transition of a polymethyl methacrylate film to the photonic resonance of a low optical-loss microcavity, which consisted of two Ge/ZnS dielectric Bragg reflectors. Transmission measurements show two distinct transmission peaks that are energetically shifted from the bare phonon and cavity resonances, indicating Rabi-splitting and the realization of polaritonic states.

Two different but partner potentials are sharing exactly the same energy spectrum. The supersymmetric eigenfunctions derived from one another by simple creation and annihilation operators and they generate classes of exceptional orthogonal polynomials. A recent topic of a great mathematical interest.