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 proposed a compact and efficient polarization rotator (PR) based on an asymmetric hybrid plasmonics waveguide (HPW) the lithium-niobate-on-insulator (LNOI) platform. focus design of rotation angle balance between two modes. The presented device exhibits extinction ratio as high 59.58 dB insertion loss 1.44 with length only 13.7 μm. fabrication tolerances suitable process are also discussed t...

We study the linear and nonlinear response of a unidirectional reflector where breaking Lorentz reciprocity is observed. The device under test consists racetrack microresonator, with an embedded S-shaped waveguide, coupled to external bus waveguide (BW). This geometry known as "taiji" microresonator (TJMR), allows selectively couple counter-propagating modes depending on propagation direction i...

We first report a simple nanoplasmonic sensor for both universal and slow-light sensing in a Fano resonance-based waveguide system. A theoretical model based on the coupling of resonant modes is provided for the inside physics mechanism, which is supported by the numerical FDTD results. The revealed evolution of the sensing property shows that the Fano asymmetric factor p plays an important rol...

A low cross-polarization slot array antenna in the narrow wall of ridge waveguide is presented. A non-angled slot which is created in the narrow wall of the ridge waveguide is considered to be used as radiating resonant slot. The normalized resistance and normalized reactance curves are presented for design purposes. A six element slot array waveguide antenna with ridges on its narrow wall is t...

Label-free photonic biosensors fabricated on silicon-on-insulator (SOI) can provide compact size, high evanescent field strength at the silicon waveguide surface, and volume fabrication potential. However, due to the large thermo optic coefficient of water-based biosamples, the sensors are temperature-sensitive. Consequently, active temperature control is usually used. However, for low cost app...

When a relativistic, femtosecond laser pulse enters waveguide, the energy is coupled into waveguide optical modes. The longitudinal field effectively accelerates electrons along axis of channel, while asymmetric transverse electromagnetic fields tend to expel fast radially outwards. At exit $\sim$${\rm nC}$, $\sim$$10\ {\rm MeV}$ electron bunch converts its mJ}$ terahertz (THz) through coherent...

Dynamical parametric encirclement around an Exceptional Point (EP) and corresponding asymmetric state transfer phenomenon have attracted considerable attention recently. In this context, beyond the reported time-asymmetric dynamics a second-order EP (EP2) in two-level system, investigation of similar third-order (EP3) multi-state having comparably complex topology with rich physics, is lacking....

Directional couplers are critical components in photonic integrated circuits used in optical communication systems. The conventional directional couplers with laterally arranged waveguides can not achieve very short coupling lengths due to extreme sensitivity to fabrication variations and limitations to produce uniformly very narrow gap layers.1) Vertical directional couplers, however, can obta...

We report on a new synthesis method of reflection filters with multilayer and waveguide structures. The filter is characterized by bandwidth as small as ≤ 1 nm for effective use in wavelength-division-multiplexed optical communications. Both the transfer-matrix method and the Fourier transformation are employed to determine the filter reflection from a spatially varying refractive index. In con...