Results 41 to 50 of about 2,375 (203)
Inverse Design of High-NA Metalens for Maskless Lithography
, 2022 We demonstrate an axisymmetric inverse-designed metalens to improve the performance of zone-plate-array lithography (ZPAL), one of the maskless lithography approaches, that offer a new paradigm for nanoscale research and industry.
Haejun Chung (5565737) +4 more
core +2 more sources
Nanomaterials, 2022 Needle beams have received widespread attention due to their unique characteristics of high intensity, small focal size, and extended depth of focus (DOF).
Zhe Shen, Shijie Huang
doaj +1 more source
High numerical aperture metalens to generate an energy backflow
Компьютерная оптика, 2020 Using electronic beam lithography and reactive ion beam etching, a metalens is manufactured in a thin layer of amorphous silicon of a 130-nm depth, a 30-µm diameter, and a 633-nm focal length (equal to the illumination wavelength).
V.V. Kotlyar +3 more
doaj +1 more source
Photonic crystal fiber metalens [PDF]
Nanophotonics, 2018 Abstract Conventional optical fiber has excellent performance in guiding light, which has been widely employed for long‐distance optical communication. Although the optical fiber is efficient for transmitting light, its functionality is limited by the dielectric properties of the core’s and cladding’s materials (e.g.
Jingyi Yang +6 more
openaire +4 more sources
Design and fabrication of bifunctional metalenses [PDF]
, 2022 openRegarding light beams, an interesting feature is the spatial distribution of their wavefront. In fact, the wavefront of light beams can be engineered to obtain a precise shape through the local modification of the phase of the electromagnetic wave ...
BONALDO, DANIELE
core
Designing high-efficiency extended depth-of-focus metalens via topology-shape optimization
Nanophotonics, 2022 Longitudinal optical field modulation is of critical importance in a wide range of applications, including optical imaging, spectroscopy, and optical manipulation.
Zheng Yuhan +8 more
doaj +1 more source
Achromatic Metalens in the Visible and Metalens with Reverse Chromatic Dispersion
, 2017 In this letter, we experimentally report an achromatic metalens (AML) operating over a continuous bandwidth in the visible. This is accomplished via dispersion engineering of dielectric phase shifters: titanium dioxide nanopillars tiled on a dielectric spacer layer above a metallic mirror.
Khorasaninejad, M. +6 more
openaire +2 more sources
Inverse design of sub-diffraction focusing metalens by adjoint-based topology optimization
New Journal of Physics, 2023 Breaking the diffraction limit to realize imaging at the nanoscale is challenging in scientific research. Traditional sub-diffraction focusing metalens is obtained by arranging artificially selected unit cells, of which the design process is passive and ...
Lianhong Dong +7 more
doaj +1 more source
Design of Polarization-Independent Reflective Metalens in the Ultraviolet–Visible Wavelength Region
Nanomaterials, 2021 Flat lens or metalens, as one of the most important application branches of metasurfaces, has recently been attracting significant research interest. Various reflective and transmissive metalenses have been demonstrated in the terathertz, infrared and ...
Huifang Guo +6 more
doaj +1 more source
Role of refractive index in metalens performance [PDF]
Applied Optics, 2019 Sub-wavelength diffractive optics, commonly known as metasurfaces, have recently garnered significant attention for their ability to create ultra-thin flat lenses with extremely short focal lengths. Several materials with different refractive indices have been used to create metasurface lenses (metalenses).
Elyas Bayati +4 more
openaire +3 more sources