Results 31 to 40 of about 659,213 (221)

Theoretical Analysis of a Volume Holographic Lens Using Matlab [PDF]

, 2019
Volume holographic lenses have great potential for different types of applications requiring light redirection and beam shaping such as solar light collection and LED light management.
Sanjay Kumar Keshri, Kevin Murphy, Keshri, Sanjay, Izabela Naydenova, Martin, Suzanne, Naydenova, Izabela, Murphy, Kevin, Suzanne Martin   +7 more
core   +1 more source

Diffractive Optical Elements with a Large Angle of Operation Recorded in Acrylamide Based Photopolymer on Flexible Substrates

International Journal of Polymer Science, 2014
A holographic device characterised by a large angular range of operation is under development. The aim of this study is to increase the angular working range of the diffractive lens by stacking three layers of high efficiency optical elements on top of ...
Hoda Akbari, Izabela Naydenova, Lina Persechini, Sean M. Garner, Pat Cimo, Suzanne Martin   +5 more
doaj   +1 more source

Ferroelectric Liquid Crystal Compound Lens Based on Pancharatnam–Berry Phase

Crystals, 2022
We report a ferroelectric liquid crystal (FLC) compound lens based on the Pancharatnam–Berry (PB) phase. The phase of the FLC compound lens is an integration of polarization grating and a PB lens. Thus, when light passes through an FLC compound lens, the
Ying Ma, Mingkui Yin, Yuhang Shan, Vladimir G. Chigrinov, Hoi-Sing Kwok, Jianlin Zhao   +5 more
doaj   +1 more source

Design of a 2 diopter holographic progressive lens

Optics Express, 2018
In this contribution, we investigate the use of holographic optical elements (HOEs) as progressive addition lenses (PALs). We design HOEs with high diffraction efficiency (DE) using the Fourier Modal Method (FMM) and optimize an optical system comprising two of these HOEs to fulfill the optical function of a 2 diopter (dpt) PAL. The resulting design is
Jannik M. Trapp, Manuel Decker, Jörg Petschulat, Thomas Pertsch, Toufic G. Jabbour   +4 more
openaire   +2 more sources

Holographic detection of nanoparticles using acoustically actuated nanolenses

Nature Communications, 2020
Detection of small, translucent particles is challenging due to their low inherent scattering. Here, the authors present an easy, high-throughput, label-free method for detecting nanoparticles in low volumes of liquids on a disposable chip, using an ...
Aniruddha Ray, Muhammad Arslan Khalid, Andriejus Demčenko, Mustafa Daloglu, Derek Tseng, Julien Reboud, Jonathan M. Cooper, Aydogan Ozcan   +7 more
doaj   +1 more source

GRIN-lens-based in-line digital holographic microscopy

Applied Optics, 2023
In-line digital holographic microscopy (DHM) provides three-dimensional images with large fields of view and depths of field and micrometer-scale resolution, using a compact, cost-effective, and stable setup. Here, we develop the theoretical background and experimentally demonstrate an in-line DHM based on a gradient-index (GRIN) rod lens. In addition,
Ali Akbar Khorshad, Nicholas Devaney
openaire   +2 more sources

Resolution Analysis in a Lens-Free On-Chip Digital Holographic Microscope [PDF]

IEEE Transactions on Computational Imaging, 2020
Lens-free on-chip digital holographic microscopy (LFOCDHM) is a modern imaging technique whereby the sample is placed directly onto or very close to the digital sensor, and illuminated by a partially coherent source located far above it. The scattered object wave interferes with the reference (unscattered) wave at the plane where a digital sensor is ...
Jialin Zhang 0003, Jiasong Sun, Qian Chen 0002, Chao Zuo 0001   +3 more
openaire   +3 more sources

A Study on Augmented 3D Display Optimization Based on Holographic Optical Element for High Depth and Magnified Image

Frontiers in Physics, 2021
Modern Pepper's ghost—“floating hologram”—systems generally use transparent screens called half mirrors or foils. this system must have the same screen size as the image size in order to display a large-sized image.
Sungjae Ha, Leehwan Hwang, Jaehyun Lee, Philippe Gentet, Soonchul Kwon, Seunghyun Lee   +5 more
doaj   +1 more source

Monolithically 3D‐Printed Spectral‐Spatial Meta‐Authenticators

Advanced Materials, EarlyView.
A single height map printed in a low‐index resin by two‐photon lithography encodes multiple visible wavelengths in one metasurface without any polarization optics. A fabrication‐aware optimization folds the printable height levels into the design, so the device is printed as optimized.
Cherry Park, Shiqi Hu, Youngsun Jeon, Junsuk Rho   +3 more
wiley   +1 more source

Wood‐Derived Nanocellulose‐Biocarbon Fresnel‐Zone Plate Lenses for Sub‐THz Frequency Applications

Advanced Materials Technologies, EarlyView.
Wood‐derived nanocellulose and lignin‐based biocarbon were combined to fabricate fully bio‐based Fresnel zone plate (FZP) lenses for sub‐terahertz frequencies. These sustainable FZP lenses exhibit low dielectric loss and high directivity, achieving performance comparable to that of metallic references, and remain functional under environmental stress ...
Riikka Haataja, Mikko Kokkonen, Niina Halonen, Sami Myllymäki, Umair Rafique, Mandeep Singh, Ossi Laitinen, Heli Jantunen, Kristiina Oksman, Henrikki Liimatainen   +9 more
wiley   +1 more source