BACKGROUND Metasurfaces have opened up a number of remarkable new approaches to
manipulate light. These flat optical elements are constructed from a dense array of strongly …

Compared with conventional optical elements, 2D photonic metasurfaces, consisting of
arrays of antennas with subwavelength thickness (the 'meta-atoms'), enable the …

The size and operating energy of a nonlinear optical device are fundamentally constrained
by the weakness of the nonlinear optical response of common materials. Here, we report …

New propagation regimes for light arise from the ability to tune the dielectric permittivity to
extremely low values. Here, we demonstrate a universal approach based on the low linear …

Free from phase-matching constraints, plasmonic metasurfaces have contributed
significantly to the control of optical nonlinearity and enhancement of nonlinear generation …

In the past 20 years, we have reached a broad understanding of many light-driven
phenomena in nanoscale systems. The temporal dynamics of the excited states are instead …

Optical switching has important applications in optical information processing, optical
computing, and optical communications. The long-term pursuit of optical switch is to achieve …

Probing the transition from a metallic state to a molecular state in gold nanoparticles is
fundamentally important for understanding the origin of surface plasmon resonance and the …

All-optical control of plasmons can enable optical switches with high speeds, small footprints
and high on/off ratios. Here we demonstrate ultrafast plasmon modulation in the near …

The evolution from the metallic (or plasmonic) to molecular state in metal nanoparticles
constitutes a central question in nanoscience research because of its importance in …