No abstract

We report dual EIT in a symmetric split-ring resonator in near-IR for varying incident angles. The metasurface supports TD and quasi-BIC MQ resonances with high Q resonance of 780 and 560 at 2º incident angle.

A novel concave shaped resonant waveguide grating has been proposed whereby simple tweaking of the etched trench dimensions can lead to high quality resonances, which can be useful in narrow band filters.

The stability of Kerr frequency combs due to the combined effect of Kerr nonlinearity and the free-carrier effects in a Silicon racetrack microring resonator has been studied through numerical simulations at low temperatures.

Dispersion engineering and enhanced light–matter interaction are the most desirable attributes for creating linear and nonlinear devices. It is always a challenging task to achieve both characteristics simultaneously. In this paper, we present a design of a silicon waveguide that provides not only enhanced light–matter interaction, measured through evanescent field strength, but also a platform to realize compact couplers and enhanced four-wave mixing efficiency. We make use of a convex-shaped design and numerically evaluate its modal characteristics. The design supports two zero dispersion wavelengths, from 1.2 µm to 1.3 µm and 1.7 µm to 1.8 µm, which can be tailored by changing the shape design parameters such as depth. Numerical simulations reveal that the depth of the convex shape affects both linear and nonlinear properties of the designed waveguide. We observe significant improvement of 15.2 dB in four-wave mixing efficiency when the waveguide is covered with a monolayer of graphene, illustrating the capabilities of such convex-shaped waveguides.