Dielectric optical waveguides constitute the main building blocks of photonic integrated
circuits (PICs). Channels with high refractive index contrast can provide very compact PIC …

A novel class of optical waveguides with a box-shaped cross section consisting of a low-
index inner material surrounded by a thin high-index coating layer is presented. This original …

Optical materials with nearly zero refractive indices have driven emerging applications
ranging from geometry-invariant optical tunneling, nonlinear optics, optical cloaking to …

We demonstrate a novel integrated silicon and ultra-low-loss Si_3N_4 waveguide platform.
Coupling between layers is achieved with (0.4±0.2) dB of loss per transition and a 20 nm 3 …

Guiding light in the low index region of a high refractive index contrast waveguide can be
beneficial for many applications including sensing, nonlinear optics and electro‐optics …

The integration density of photonic integrated circuits has been limited by light coupling
between waveguides. Traditional approaches to layout the waveguide with high density are …

We investigate niobium oxide (NbO) as an alternative waveguide material for applications in
the visible spectral range. NbO has a refractive index ranging between 2.3 and 2.35, which …

It is possible to construct a hollow optical waveguide trapping light in air or a vacuum by
means of reflectors with high reflectivity. In this paper, a variable function is proposed to vary …

Next-generation high-end data processing systems such as Internet switches or servers
approach aggregate bandwidth in excess of 1 Tb/s. The task of providing hundreds of …

Optical waveguides are the most fundamental building blocks of integrated optical circuits.
They are extremely well understood, yet there is still room for surprises. Here, we introduce a …