We present results of our ab initio studies of electronic and dynamic properties of ideal palladium hydride PdH and its vacancy ordered defect phase Pd3VacH4 with L12 crystal structure proposed theoretically and found experimentally. Quantum and electronic properties of these hydrides, such as phonon dispersion relations and the vacancy formation enthalpies have been studied. Dynamic stability ...

Introduction: The operation of a laser in a stable single fundamental mode is important for a variety of applications, such as short and midrange optical networks (high quality local area networks and storage area networks). For these purposes, vertical cavity surface-emitting lasers (VCSELs) show more promise in many cases over distributed feedback (DFB) lasers for a variety of reasons: easy a...

Flexible boundary condition methods couple an isolated defect to a harmonically responding medium through the bulk lattice Green’s function; in the case of an interface, interfacial lattice Green’s functions. We present a method to compute the lattice Green’s function for a planar interface with arbitrary atomic interactions suited for the study of line defect/interface interactions. The interf...

Silicon photonic crystal sensors have become very attractive for various optical sensing applications. Using silicon as a material platform provides the ability to fabricate sensors with other photonic devices on a single chip. In this paper, a new optical sensor based on optical resonance in a one-dimensional silicon photonic crystal with an air defect is theoretically studied for refractive i...

W e present experiments on a single particle driven through a threedimensional colloidal crystal. Using optical tweezers a tracer particle was trapped in the bulk of a colloidal crystal of host spheres. The crystal was moved past the trapped particle at constant velocities. Only the tracer particle was trapped because it had a high refractive index core, while no optical forces were exerted on ...

Gate dielectrics comprised of nanocrystalline HfO2 in gate stacks with thin SiO2/SiON interfacial transition regions display significant asymmetries with respect to trapping of Si substrate injected holes and electrons. Based on spectroscopic studies, and guided by ab initio theory, electron and hole traps in HfO2 and other transition metal elemental oxides are assigned to O-atom divacancies, c...

Cyclohexane, C6H12, is one of the simplest organic molecules due to its sixfold symmetry and weak van der Waals interaction. The dynamic characteristics have been extensively studied in the liquid and plastic crystal phases by spectroscopic means and have been analysed in terms of an unhindered rotator model. The transition from the liquid to the plastic crystal at 6.55C involves a low entropy ...

In the present work, a new vertical cavity surface emitting laser (VCSEL) structure employing combined oxide layer and single defect photonic crystal index guiding layer has been investigated for L-band optical fiber application. The basic design goal was to obtain photonic crystal VCSEL (PhC VCSEL) with the high power, high slop efficiency and low threshold that operate at 1.55-1.6μm wavelengt...

The paper focuses on the void swelling processes in materials subjected to radiation, that occur due formation of ensemble crystal lattice. According theoretical analysis kinetics and pore size distribution with regard defect migration, numerical calculations are performed for nickel.

here, we propose an add-drop and a channel drop filter based on two-dimensional photonic crystal all circular ring resonators. these structures are made of a square lattice of silicon rods with the refractive index n1=3.464 surrounded by air (with refractive index n2=1). the broadest photonic band gap occurs at the filling ratio of r/a = 0.17. two linear defect w1 waveguides couple to the ring....