2008 NOV 24 - (VerticalNews.com) -- According to a study from Argentina, "We studied the intensity of resonant Raman scattering due to optical phonons in a planar II-VI-type semiconductor microcavity in the regime of strong coupling between light and matter. Two different sets of independent experiments were performed at near outgoing resonance with the middle polariton (MP) branch of the cavity."

  "In the first, the Stokes-shifted photons were kept at exact resonance with the MP, varying the photonic or excitonic character of the polariton. In the second, only the incoming light wavelength was varied, and the resonant profile of the inelastic scattered intensity was studied when the system was tuned out of the resonant condition. Taking some matrix elements as free parameters, both independent experiments are quantitatively described by a model which incorporates lifetime effects in both excitons and photons, and the coupling of the cavity photons to the electron-hole continuum," wrote A. Bruchhausen and colleagues ...read more

  2008 NOV 24 - (VerticalNews.com) -- "We have experimentally demonstrated the fabrication of GaAs triangular two-dimensional photonic crystals (2D PCs) on a silicon wafer by divinylsiloxane-bis(benzocyclobutene) (DVS-BCB) wafer bonding. Various types of 2D PCs, including cavities and waveguides, have been successfully fabricated," researchers in Tsukuba, Japan report.

  "A 2D PC array with a total of similar to 900 array elements has been well formed in a 0.9 x 0.7 mm(2) region. In addition, we have theoretically analyzed the photonic band structures GaAs triangular 2D PCs covered with DVS-BCB cladding. Although the cladding is not air, a large photonic band gap fir transverse-electric modes can be obtained. We also investigated various properties of DVS-BCB-clad 2D PC cavities, including modal symmetry resonant frequency," wrote M. Okano and colleagues ...read more

  2008 NOV 24 - (VerticalNews.com) -- According to recent research from Beijing, People's Republic of China, "A phenomenological Lagrangian approach is employed to study the electromagnetic properties of the deuteron. The deuteron is regarded as a weakly bound state of the proton and neutron."

  "We construct a general form for the electromagnetic one- and two-body transition operators formulated in terms of the nucleon fields, which are then used in the calculation of the electromagnetic deuteron form factors. One of the two-body operators is responsible for explaining the quadrupole moment form factor," wrote Y.B. Dong and colleagues ...read more