We report room-temperature lasing from an optically pumped subwavelength-scale cylindrical InGaAsP pillar surrounded by circular Bragg reflectors on a metal substrate with a dielectric spacer layer. By taking advantage of wide in-plane photonic bandgaps and proper vertical antiresonances, three dielectric Bragg pairs produce a sufficient optical feedback capable of low threshold lasing from the...

|In this paper, the region of interest consists of the spherical dielectric earth, coated with a dielectric layer under the air. First, we will derive the formulas for the electromagnetic ­ eld in the earth of a vertical electric dipole located in the air and those of a vertical magnetic dipole, respectively. Then, the formulas for the components of the ­ eld in the air generated by a horizonta...

In this paper we look at the effect of Fringe-Enhanced-Barrier-lowering (FEBL) for highK dielectric MOSFETs and the dependence of FEBL on various technological parameters (spacer dielectrics, overlap length, dielectric stack, S/D junction depth and dielectric thickness). We show that FEBL needs to be contained in order to maintain the performance advantage with scaled high-K dielectric MOSFETs....

We study localized modes at a surface of a multilayer structure made of graphene layers separated by dielectric layers. We demonstrate the existence of deeply subwavelength surface modes that can be associated with the electromagnetic Tamm states, with the frequencies in the THz frequency range the negative group velocities. We suggest that the dispersion properties of these Tamm surface modes ...

The scattering of a surface wave of a dielectric layer backed by a ground plane from the whispering-gallerymode dielectric resonators is considered by use of the surface potential approach and analytical regularization. Efficient numerical algorithms have been developed with applications to the bandstop filter design. Transmitted and reflected power fractions and radiation and absorption losses...

Application of π-multilayer technology is extended to high extinction coefficient materials, which is introduced into metal-dielectric filter design. Metal materials often have high extinction coefficients in far ultraviolet (FUV) region, so optical thickness of metal materials should be smaller than that of the dielectric material. A broadband FUV filter of 9-layer non-periodic Al/MgF2 multila...

We have grown and compared microstructures and dielectric properties of PNZST thin films prepared on two different substrates by sol /gel methods. To ensure a complete single-phase perovskite PNZST thin film, a capping layer of PbO must be added to the top surface of the thin film before final heat treatment. Microstructure characterization was examined with X-ray diffraction, scanning and tran...

A theory is presented for the dispersion relations of the nonlinear phonon-polaritons arising when phonons are coupled to the electromagnetic waves in multilayered structures of nonlinear materials. The calculations are applied to a multilayered structure consisting of a thin film surrounded by semi-infinite bounding media where each layer may have a frequency dependent dielectric function and ...

The dielectric functions of Gaand As-terminated GaAs~001! surfaces are determined by using a three-layer model and experimentally available surface photoabsorption ~SPA! data, and are compared to those previously obtained from reflectance-difference spectroscopy. Using the SPA-derived dielectric functions, approaches for optimizing conditions in SPA experiments for GaAs and other materials are ...

In this paper, we have proposed a shell type dielectric microsphere resonator in order to enhance its quality factor. In this work we have assumed that the radius of dielectric microsphere is 12μm and that the interior metal layer radius is 11.5μm. We have obtained analytic equations for Vector potentials, characteristic equation, quality factor, resonance frequency and resonance location of TE...