As the most common nonlinear optical process, second harmonic generation (SHG) has
important application value in the field of nanophotonics. With the rapid development of …

High-power terahertz (THz) generation in the frequency range of 0.1–10 THz has been a fast-
developing research area ever since the beginning of the THz boom two decades ago …

Even though the terahertz spectrum is well suited for chemical identification, material
characterization, biological sensing and medical imaging, practical development of these …

Integrated thin-film lithium niobate platform has recently emerged as a promising candidate
for next-generation, high-efficiency wavelength conversion systems that allow dense …

The phase-matching condition is a key aspect in nonlinear wavelength conversion
processes, which requires the momenta of the photons involved in the processes to be …

Photonic integrated circuits hold promise as miniaturized and scalable platforms for classical
and quantum photonic information processing. Second-order nonlinearity (χ^(2)) is the basis …

In the last decade quantum cascade lasers (QCLs) have become the most widely used
source of mid-infrared radiation, finding large scale applications because of their wide …

In its 60 years of existence, the field of nonlinear optics has gained momentum especially
over the past two decades thanks to major breakthroughs in material science and …

We describe a novel approach based on topology optimization that enables automatic
discovery of wavelength-scale photonic structures for achieving high-efficiency second …

The terahertz spectral range (λ= 30–300 µm) has long been devoid of compact, electrically
pumped, room-temperature semiconductor sources,,,. Despite recent progress with terahertz …