A polarization splitter and rotator that is compatible with optical integration is presented. In contrast to prior efforts to achieve this functionality, the adiabatic nature of this approach allows for nearly ideal performance over the 1.5-1.6μm regime. c © 2003 Optical Society of America OCIS codes: (130.3120) Integrated optics devices; (130.2790) Guided Waves High index contrast waveguides a...

We propose a quasi-D-shaped photonic-crystal-fiber surface-plasmon-resonance (PCF-SPR) biosensor based on ultrashort side polishing. The gold film layer of the side-polishing PCF-SPR is close to fiber core. It can enhance effect and test strong interaction between samples difficulties process lateral transfer. numerically simulate coupling characteristics sensor by full vector finite element me...

Boltzmann or not? Most luminescent thermometers rely on a configurational crossover between two excited states with high mutual non-radiative transition rates and relative sensitivity. It is shown that these materials follow “quasi”-Boltzmann law as demonstrated for the case of Sm 2+ .

Alrstract--We consider the robust stability problem for a class of uncertain neutral time-delay systems where the characteristic equations involve a polytope ~ of quasipolynomials of neutral type. Given a stability region D in the complex plane our goal is to find a constructive technique to verify the D-stability of ~ (i.e. to verify whether the roots of every quasipolynomial in ~ all belong t...

The ring decomposition technique of part I is extended to the case when the factors in the direct product decomposition are no longer fields but arbitrary chain rings. This includes not only the case of quasi-cyclic codes over rings but also the case of quasi-cyclic codes over fields whose co-index is no longer prime to the characteristic of the field. A new quaternary construction of the Leech...

We provide a method for constructing a class of multivariate copulas depending on a univariate function. We study some properties of this class and present several examples. The same circle of ideas is used in a similar construction of quasi–copulas.

We introduce the notion of a standard system in order to deal with quasi-hereditary algebras. We shall prove that a necessary and sufficient condition for a finite dimensional algebra to be quasi-hereditary is the existence of a full and divisible standard system. As a further application, we obtain a sufficient condition for a standardly stratified algebra. To Roger Carter on his 65th birthday

In this paper, we investigate approximation of quasi-projection operators in Besov spaces B p,q, μ > 0, 1 ≤ p, q ≤ ∞. Suppose I is a countable index set. Let (φi)i∈I be a family of functions in Lp(IR), and let (φ̃i)i∈I be a family of functions in Lp̃(IR), where 1/p+ 1/p̃ = 1. Let Q be the quasi-projection operator given by