Zoom lenses with variable focal lengths and magnification ratios are essential for many
optical imaging applications. Conventional zoom lenses are composed of multiple refractive …

Optical imaging systems have greatly extended human visual capabilities, enabling the
observation and understanding of diverse phenomena. Imaging technologies span a broad …

Metalenses consisting of nanoscale unit cells provide new opportunities for miniaturization,
light-weight, and diversification of conventional optical lenses. Fabrication of metalenses is …

Thermal imaging at the infrared wavelength regime has long been applied to different areas
such as agriculture and defense industries. Metasurfaces, 2D engineered ultra-thin …

Flat, gradient index, metasurface optics–in particular all-dielectric metalenses–have
emerged and evolved over recent years as compact, lightweight alternative to their …

Polarization and focal length are both critical optical parameters with many applications in
many fields, such as optical communications and imaging. The development of …

Terahertz (THz) waves show outstanding application value in the nondestructive detection of
hidden targets that are impenetrable to visible light. However, the uncertain location of …

Tunable devices based on bilayer metasurfaces have attracted researchers' attention in
recent years for their accurate tuning abilities and high integration. In tunable devices such …

Based on the impedance-matching theory, a double-layer metal structure dynamical
focusing cylindrical metalens with a stretchable substrate was designed at the operation …

Flat lenses with focal length tunability can enable the development of highly integrated
imaging systems. This work explores machine learning to inverse design a multifocal …