We report a novel subwavelength grating that has a very broad reflection spectrum and very
high reflectivity. The design is scalable for different wavelengths. It facilitates monolithic …

A new class of planar optics has emerged using subwavelength gratings with a large
refractive index contrast, herein referred to as high-contrast gratings (HCGs). This seemingly …

Metasurfaces, two dimensional (2D) metamaterials comprised of subwavelength features,
can be used to tailor the amplitude, phase and polarisation of an incident electromagnetic …

Recently, metamaterials-inspired diffraction gratings (or metagratings) have demonstrated
unprecedented efficiency in wavefront manipulation by means of relatively simple structures …

Molding the wavefront of light is a basic principle of any optical design. In conventional
optical components such as lenses and waveplates, the wavefront is controlled via …

The high refractive index of hydrogenated amorphous silicon (a‐Si: H) at optical frequencies
is an essential property for the efficient modulation of the phase and amplitude of light …

In the past centuries, the scale of engineering optics has evolved toward two opposite
directions: one is represented by giant telescopes with apertures larger than tens of meters …

The growing maturity of nanofabrication has ushered massive sophisticated optical
structures available on a photonic chip. The integration of subwavelength-structured …

The growing maturity of nanofabrication technology has recently enabled the deployment of
high‐quality subwavelength nanostructures on photonic chips. Combining existing photonic …

Periodic structures with a sub‐wavelength pitch have been known since Hertz conducted his
first experiments on the polarization of electromagnetic waves. While the use of these …