scholarly journals High-efficiency large-angle Pancharatnam phase deflector based on dual-twist design

2017 ◽  
Vol 25 (6) ◽  
pp. 6283 ◽  
Author(s):  
Kun Gao ◽  
Colin McGinty ◽  
Harold Payson ◽  
Shaun Berry ◽  
Joseph Vornehm ◽  
...  
Keyword(s):  
High Efficiency ◽  
Large Angle ◽  
Pancharatnam Phase

Rectangular dielectric metagrating for high-efficiency diffraction with large-angle deflection

2020 ◽  
Vol 18 (7) ◽  
pp. 073601
Author(s):  
Weiyi Shi ◽  
Weimin Deng ◽  
Weinan Liu ◽  
Zepeng Zhuang ◽  
Zhibin Fan ◽  
...  
Keyword(s):  
High Efficiency ◽  
Large Angle

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

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Hoda Akbari ◽  
Izabela Naydenova ◽  
Lina Persechini ◽  
Sean M. Garner ◽  
Pat Cimo ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
High Efficiency ◽  
Large Angle ◽  
Optical Recording ◽  
Holographic Recording ◽  
Angular Range ◽  
Optical Elements ◽  
Lens Element ◽  
Single Lens ◽  
Exposure Energy

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 each other so that light is collected (and focussed) from a broader range of angles. The angular range of each individual lens element is important, and work has already been done in an acrylamide-based photosensitive polymer to broaden the angular range of individual elements using holographic recording at a low spatial frequency. This paper reports new results on the angular selectivity of stacked diffractive lenses. A working range of 12° is achieved. The diffractive focussing elements were recorded holographically with a central spatial frequency of 300 l/mm using exposure energy of 60 mJ/cm2at a range of recording angles. At this spatial frequency with layers of thickness 50 ± 5 µm, a diffraction efficiency of 80% and 50% was achieved in the single lens element and combined device, respectively. The optical recording process and the properties of the multilayer structure are described and discussed. Holographic recording of a single lens element is also successfully demonstrated on a flexible glass substrate (Corning(R) Willow(R) Glass) for the first time.

scholarly journals Large-angle and high-efficiency tunable phase grating using fringe field switching liquid crystal

2015 ◽  
Vol 23 (9) ◽  
pp. 12274 ◽  
Author(s):  
Daming Xu ◽  
Guanjun Tan ◽  
Shin-Tson Wu
Keyword(s):  
Liquid Crystal ◽  
High Efficiency ◽  
Large Angle ◽  
Fringe Field ◽  
Phase Grating

scholarly journals High-efficiency, tunable, fringe-field switching-mode beam steering based on a liquid crystal Pancharatnam phase

2020 ◽  
Vol 59 (34) ◽  
pp. 10706
Author(s):  
Comrun Yousefzadeh ◽  
Andre Van Rynbach ◽  
Doug Bryant ◽  
Philip Bos
Keyword(s):  
Liquid Crystal ◽  
High Efficiency ◽  
Beam Steering ◽  
Fringe Field ◽  
Pancharatnam Phase ◽  
Mode Beam ◽  
Switching Mode

scholarly journals Mid-infrared large-angle high-efficiency retroreflector based on subwavelenght metallic metagrating

2020 ◽  
Vol 69 (1) ◽  
pp. 014211
Author(s):  
Mei-Ou Wang ◽  
Qian Xiao ◽  
Xia Jin ◽  
Yan-Yan Cao ◽  
Ya-Dong Xu
Keyword(s):  
High Efficiency ◽  
Large Angle ◽  
Mid Infrared

scholarly journals Generation of Multiple Pseudo Bessel Beams with Accurately Controllable Propagation Directions and High Efficiency Using a Reflective Metasurface

2020 ◽  
Vol 10 (20) ◽  
pp. 7219
Author(s):  
Haixia Liu ◽  
Hao Xue ◽  
Yongjie Liu ◽  
Long Li
Keyword(s):  
Electromagnetic Waves ◽  
High Efficiency ◽  
Superposition Principle ◽  
Bessel Beam ◽  
Large Angle ◽  
Propagation Distance ◽  
Wireless Power ◽  
Bessel Beams ◽  
Full Wave ◽  
Measurement Results

In this paper, a generation method procedure based on a reflective metasurface is proposed to generate multiple pseudo Bessel beams with accurately controllable propagation directions and high efficiency. Firstly, by adjusting the miniaturized unit cell of the reflective metasurface to modulate the electromagnetic waves using the proposed method, some off-axis pseudo Bessel beams with different propagation directions are generated. Then, by achieving the large-angle deflection and comparing the results with previous existing methods, the superiority of the proposed method is demonstrated. Based on the generated single off-axis pseudo Bessel beam and the superposition principle of the electromagnetic wave, a reflective metasurface with 47 × 47 elements is designed and fabricated at 10 GHz to generate dual pseudo Bessel beams. Full-wave simulation and experimental measurement results validate that the dual pseudo Bessel beams were generated successfully. The propagation directions of the dual pseudo Bessel beams can be controlled accurately by the reflective metasurface, and the efficiency of the beams is 59.2% at a propagation distance of 400 mm. The energy of the beams keeps concentrating along the propagation axes, which provides a new choice for wireless power transfer and wireless communication with one source to multiple receiving targets.

Analysis of a dual-twist Pancharatnam phase device with ultrahigh-efficiency large-angle optical beam steering

2015 ◽  
Vol 54 (34) ◽  
pp. 10035 ◽  
Author(s):  
HsienHui Cheng ◽  
Achintya K. Bhowmik ◽  
Philip J. Bos
Keyword(s):  
Beam Steering ◽  
Large Angle ◽  
Optical Beam ◽  
Pancharatnam Phase

Concept for a transmissive, large angle, light steering device with high efficiency

2015 ◽  
Vol 40 (9) ◽  
pp. 2080 ◽  
Author(s):  
Hsien Hui Cheng ◽  
Achintya K. Bhowmik ◽  
Philip J. Bos
Keyword(s):  
High Efficiency ◽  
Large Angle

Wave‐field extrapolation by the linearly transformed wave equation

Geophysics ◽  
1986 ◽  
Vol 51 (8) ◽  
pp. 1538-1551 ◽  
Author(s):  
Zhiming Li
Keyword(s):  
Wave Equation ◽  
Finite Difference ◽  
High Efficiency ◽  
Seismic Imaging ◽  
Order Approximation ◽  
Finite Difference Methods ◽  
Large Angle ◽  
The One ◽  
First Order Approximation ◽  
Degree Equation

Many approximations to different order of the one‐way scalar wave equation have been suggested in seismic imaging or modeling. Of these approximations, the first‐order approximation, usually called the 15‐degree equation, is most commonly used in industry because of its high efficiency. However, one common constraint of all these approximations is that they cannot handle large‐angle events exactly. Through a linear transformation of the wave equation, the LInearly Transformed Wave EQuation (LITWEQ) is obtainable, without approximation. The LITWEQ has the form of the 15‐degree equation. The solution to the LITWEQ is still a two‐way wave solution. By imposing the boundary condition for upcoming (or downgoing) waves, the LITWEQ can be applied to seismic imaging (or modeling). Implementing the LITWEQ with a finite‐differencing algorithm gives a 180‐degree, or all‐dip, finite‐difference wave‐extrapolation operator, which solves the angle limitation problem of conventional finite‐difference methods.

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