An experimental setup of three coupled PT -symmetric waveguides showing the characteristics of a third-order exceptional point (EP3) has been investigated by Heiss and Wunner in an idealized model of three δ-function waveguides [W. D. Heiss and G. Wunner, J. Phys. A 49, 495303 (2016)]. Here we extend these investigations to realistic, extended waveguide systems. We place major focus on the stro...

The fundamental properties of a bimodal waveguide interferometer were studied to evaluate its suitability for high sensitive biosensing applications. KeywordsBimodal waveguide, biosensors,, integrated optics, multimode waveguides, optical waveguides

Recent progress in the development of Continuous Wave Terahertz sources based on Ultra-Fast Photodetectors operating at 1.55 μm is reported. The Uni-Travelling Carrier Photodiode is realised as a broadband and high-efficiency photomixer while the frequency response advantage of employing a travelling wave design is demonstrated. State-of-the-art bandwidth-efficiency product from Coplanar Wavegu...

We prove exponential decay for the solution of the Schrödinger equation on a dissipative waveguide. The absorption is effective everywhere on the boundary but the geometric control condition is not satisfied. The proof relies on separation of variables and the Riesz basis property for the eigenfunctions of the transverse operator. The case where the absorption index takes negative values is als...

We show that the main guiding mechanisms in dielectric-core photonic crystal optical waveguides are total internal reflection and distributed Bragg reflection. We also show that by placing a slab of semiconductor material between two photonic band gap ~PBG! mirrors, we can obtain waveguide modes at frequencies out of the photonic bandgap. These modes are similar to the modes of a conventional d...

A bow-tie slot antenna fed by a coplanar waveguide is designed for wideband operation for radar applications. The new design exhibits 40% bandwidth with center frequency around 1 1 GHz. One and two elements are designed analyzed and verification with measurements is presented.

We propose a novel hollow-core slow light waveguide using high contrast grating (HCG). Light propagates in air along a path bounded by two HCG layers. A strong interaction between the light and the HCG leads to a large group index, and thus the slow light effect. Waveguide loss and group index can be optimized separately by tuning the HCG and waveguide parameters. High performance slow light is...

The paper presents the design of a novel ultra-wideband microwave crossover for the use in microstrip circuits. The proposed structure includes a double microstrip-coplanar waveguide (CPW) vertical interconnect in single-layer substrate technology which allows an inclusion of a finite-width coplanar waveguide (CPW) on the top side of the substrate to achieve the required cross-link. The present...

Failure mode characterization was applied to coplanar transmission lines by utilizing 0.5–10-GHz S-parameter measurements and post-calculated TDR (Time-Domain-Reflectometry) analysis. Coplanar waveguide transmission lines were inkjet-printed on 1.0-mmthick flexible plastic RF substrates. Inductive, resistive, and capacitive types of failures — as the main failure modes caused by manufacturing, ...