A sort of gravitational waveguide effect in cosmology could explain, in principle, the huge luminosities coming from quasars using the cosmological large scale structures as selfoc–type or planar waveguides. Furthermore, other anomalous phenomena connected with quasars, as the existence of “brothers” or “twins” objects having different brilliancy but similar spectra and redshifts, placed on the...

We introduce a liquid-filled photonic crystal fiber to simulate a retinal cone photoreceptor mosaic and the directionality selective mechanism broadly known as the Stiles-Crawford effect. Experimental measurements are realized across the visible spectrum to study waveguide coupling and directionality at different managed waveguide parameters. The crystal fiber method is a hybrid tool between th...

The characteristics of guided waves scattered by nonuniform Bragg waveguide gratings are systematically investigated by using a staircase approximation, which is a combination of the building blocks of the multimode network theory and a rigorous mode-matching procedure. The bent dielectric waveguides, periodically with Bragg gratings of rectangular profile and chirped waveguide gratings, are ta...

A sort of gravitational waveguide effect in cosmol-ogy could explain some anomalous phenomena which cannot be understood by the current gravitational lensing models as the existence of " twins " objects with similar spectra and redshifts posed on the sky with large angular distance. Furthermore, the huge luminosities of quasars could be explained using filamen-tary or planar cosmological struct...

Erratum: Equations D5 and E3 in the appendices of [1] contain typographical errors. They should read W ≡ diag(W í µí±›); W í µí±› ≡ í µí± � 0í µí±› í µí±£ 0í µí±› í µí±– 0í µí±› = í µí±£ 0í µí±› * í µí±£ 0í µí±› í µí± � 0í µí±› í µí± 0í µí±› * (D5) and U ≡ diag � |í µí±£ 0í µí±š | í µí±£ 0í µí±š �Re�í µí± ref í µí±š � �í µí± ref í µí±š � �. (E3) Also, the reference to Eq. (20) just after e...

A new time-domain theory for waveguides has been presented in the paper. The electromagnetic fields are first expanded by using the complete sets of vector modal functions derived from the transverse electric field. The expansion coefficients are then determined by solving inhomogeneous Klein-Gordon equation in terms of retarded Green’s function. The theory has been validated by considering pro...

A novel planar Penning trap is presented, which results from the projection of the well-known three-dimensional cylindrical trap onto the surface of a chip. The introduced trap is also a coplanar-waveguide cavity, similar to those used in circuit quantum electrodynamics experiments with superconducting two-level systems. It opens up the possibility of integrating a single trapped electron, or g...

In this Article dispersion characteristic of conventional optical waveguide with helical winding at core – cladding interface has been obtained. The model dispersion characteristics of optical waveguide with helical winding at core-cladding interface have been obtained for five different pitch angles. This paper includes dispersion characteristics of optical waveguide with helical winding, and ...

We present and validate a semianalytical quasi-normal mode (QNM) theory for the local density of states (LDOS) in coupled photonic crystal (PhC) cavity-waveguide structures. By means of an expansion of the Green's function on one or a few QNMs, a closed-form expression for the LDOS is obtained, and for two types of two-dimensional PhCs, with one and two cavities side-coupled to an extended wave...