Optical nanoantennas can be used for coupling radiation to or from waveguides in analogy to micro- and radio-wave systems. In this letter we provide a systematic description of the design approaches for a coupler to a plasmonic slot waveguide in the telecom range around 1.55 µm with realistic excitation from a lensed optical fiber. We show that the best coupling efficiency of 26% can be achieve...

Absfrucf-A comprehensive analysis of the symmetric nonlinear directional coupler as a function of the excitation conditions is reported. The analysis is based on a coupled-mode technique in normalized (dimensionless) parameters, using the linear supermodes of the guiding structure, most of the results being derived from the Hamiltonian of the resulting nonlinear equations. The exchange of power...

In a three-guide coupler with multimode central waveguide more than two modes of the entire structure participate in the coupling between the outer waveguides. Using a three mode approximation we found simple conditions for complete power transfer between the outer waveguides: the device length has to match certain multiples of the conventionally defined coupling length. The specific form of th...

A Yb(3+):Ca(4)GdO(BO(3))(3) (Yb:GdCOB) crystal has been diode pumped for the first time to our knowledge. We obtained 47.5% slope efficiency at 6 degrees C, producing 191 mW of power at 1050 nm, with a 2.4% output coupler. Temperature does not significantly affect the laser performance: At room temperature we still obtained 180 mW of power for the same cavity. We achieved tunability of the Yb:G...

We propose a mode-evolution-based coupler for high saturation power germanium-on-silicon photodetectors. This coupler uniformly illuminates the intrinsic germanium region of the detector, decreasing saturation effects, such as carrier screening, observed at high input powers. We demonstrate 70% more photocurrent generation (9.1-15.5 mA) and more than 40 times higher opto-electrical bandwidth (0...

TV combiner is a device which can be used to transmit two or more TV or FM programs with different frequencies and power levels by a single wide band antenna simultaneously. One of the following three methods is usually used for its construction: 1-Star Point Filters, 2-Directional Coupler Filters and 3Phase Line Method. In this paper, using phase line method which is simpler compared to other ...

in this paper a novel all-optical logic nand, nor and xor gate based on nonlinear directional coupler theory is demonstrated. we use the identical structure which contains three waveguides, for designing these gates; the only difference however, is the power of inputs light beam. in other words, while a beam with 4 w/μm in power considered as logical one, the output is nand gate and if a beam w...

Superconducting coupler architecture demonstrates great potential for scalable and high-performance quantum processors, yet how to design efficiently automatically "Qubit-Coupler-Qubit (QCQ)" from the layout perspective remains obscure. In this work, optimal QCQ is studied first time we come up with three key findings. Firstly, acquire crucial zero-coupling condition that only dependent on geom...