Metamaterials with a Dirac-like cone dispersion at the center of the Brillouin zone behave
like an isotropic and impedance-matched zero refractive index material at the Dirac-point …

With its unique and exclusive linear and nonlinear optical characteristics, epsilon-near-zero
(ENZ) photonics has drawn a tremendous amount of attention in the recent decade in the …

In terahertz (THz) technologies, generation and manipulation of THz waves are two key
processes usually implemented by different device modules. Integrating THz generation and …

Nonlinear optical effects have enabled numerous applications such as laser frequency
conversion, ultrafast electro-optical, and all-optical modulation. Both gaseous and bulk …

Generation and manipulation of terahertz (THz) waves are of vital importance for advancing
THz technology. Nonlinear metasurfaces allow effective integration of both processes into a …

Optical metasurfaces are endowed with unparallel flexibility to manipulate the light field with
a subwavelength spatial resolution. Coupling metasurfaces to materials with strong optical …

We study theoretically and experimentally the nonlinear THz emission from plasmonic
metasurfaces and show that a thin indium-tin oxide (ITO) film significantly affects the …

To prevent the crosstalk between adjacent waveguides in photonic integrated circuits, the
minimum thickness of the cladding layers is around half a wavelength, which imposes a …

When a charged particle penetrates through an optical interface, photon emissions emerge—
a phenomenon known as transition radiation. Being paramount to fundamental physics …

Epsilon-near-zero (ENZ) materials have shown significant potential for nonlinear optical
applications due to their extraordinary enhancement of optical nonlinearity. Our experiments …