scholarly journals Inverse design and demonstration of high-performance wide-angle diffractive optical elements

2020 ◽  
Vol 28 (15) ◽  
pp. 22321 ◽  
Author(s):  
Dong Cheon Kim ◽  
Andreas Hermerschmidt ◽  
Pavel Dyachenko ◽  
Toralf Scharf
Keyword(s):  
High Performance ◽  
Inverse Design ◽  
Wide Angle ◽  
Diffractive Optical Elements ◽  
Optical Elements

scholarly journals Inverse design of diffractive optical elements using step-transition perturbation approach

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Dong Cheon Kim ◽  
Andreas Hermerschmidt ◽  
Pavel Dyachenko ◽  
Toralf Scharf
Keyword(s):  
Surface Profile ◽  
Optimization Method ◽  
Inverse Design ◽  
Perturbation Approach ◽  
Diffractive Optical Elements ◽  
Optical Elements ◽  
Design Flexibility ◽  
Gradient Based ◽  
Step Transition ◽  
Efficient Approximation

AbstractDiffractive optical elements are ultra-thin optical components required for a variety of applications because of their high design flexibility. We introduce a gradient-based optimization method based on a step-transition perturbation approach which is an efficient approximation method using local field perturbations due to sharp surface profile transitions. Step-transition perturbation approach be available to calculate the gradient of figure of merit straightforwardly, we implemented optimization method based on this gradient. This fast and accurate inverse design creates binary (2-level) diffractive elements with small features generating the wide angle beam arrays. The results of the experimental characterization confirm that the optimization based on the perturbation method is valid for 1-to-117 fan-out grating generating beam pattern of linear array.

Synthesizing High-performance Reconfigurable Meta-devices through Multi-objective Optimization

2021 ◽  
Vol 35 (11) ◽  
pp. 1441-1442
Author(s):  
Sawyer Campbell ◽  
Yuhao Wu ◽  
Eric Whiting ◽  
Lei Kang ◽  
Pingjuan Werner ◽  
...  
Keyword(s):  
Phase Change ◽  
High Performance ◽  
Phase Change Materials ◽  
State Of The Art ◽  
Power Reduction ◽  
Inverse Design ◽  
Challenging Problem ◽  
Multi Objective Optimization ◽  
Optical Elements ◽  
Multi Objective

Metasurfaces offer the potential to realize large SWaP (size, weight, and power) reduction over conventional optical elements for their ability to achieve comparable functionalities in ultrathin geometries. Moreover, metasurfaces designed with phase change materials offer the potential to go beyond what is achievable by conventional optics by enabling multiple functionalities in a single reconfigurable meta-device. However, designing a single metasurface geometry that simultaneously achieves multiple desired functionalities while meeting all bandwidth requirements and fabrication constraints is a very challenging problem. Fortunately, this challenge can be overcome by the use of state-of-the-art multi-objective optimization algorithms which are well-suited for the inverse-design of multifunctional meta-devices.

Cross-diffractive optical elements for wide angle geometric camera calibration

2011 ◽  
Vol 36 (24) ◽  
pp. 4770 ◽  
Author(s):  
Simon Thibault ◽  
Aymen Arfaoui ◽  
Pierre Desaulniers
Keyword(s):  
Camera Calibration ◽  
Wide Angle ◽  
Diffractive Optical Elements ◽  
Optical Elements

Multi-step electron beam technology for the fabrication of high performance diffractive optical elements

2005 ◽  
Vol 77 (3-4) ◽  
pp. 347-357 ◽  
Author(s):  
A. Kowalik ◽  
K. Góra ◽  
Z. Jaroszewicz ◽  
A. Kołodziejczyk
Keyword(s):  
Electron Beam ◽  
High Performance ◽  
Diffractive Optical Elements ◽  
Optical Elements

A Recommender System for Inverse Design of Polycarbonates and Polyesters

2020 ◽  
Author(s):  
Nathaniel Park ◽  
Dmitry Yu. Zubarev ◽  
James L. Hedrick ◽  
Vivien Kiyek ◽  
Christiaan Corbet ◽  
...  
Keyword(s):  
Ring Opening ◽  
High Performance ◽  
Recommendation System ◽  
Polymeric Materials ◽  
Monomer Conversion ◽  
Design Strategy ◽  
Ring Opening Polymerization ◽  
Inverse Design ◽  
False Negatives ◽  
Accelerate Development

The convergence of artificial intelligence and machine learning with material science holds significant promise to rapidly accelerate development timelines of new high-performance polymeric materials. Within this context, we report an inverse design strategy for polycarbonate and polyester discovery based on a recommendation system that proposes polymerization experiments that are likely to produce materials with targeted properties. Following recommendations of the system driven by the historical ring-opening polymerization results, we carried out experiments targeting specific ranges of monomer conversion and dispersity of the polymers obtained from cyclic lactones and carbonates. The results of the experiments were in close agreement with the recommendation targets with few false negatives or positives obtained for each class.<br>

scholarly journals Frequency Division Multiplexing of Terahertz Waves Realized by Diffractive Optical Elements

2021 ◽  
Vol 11 (14) ◽  
pp. 6246
Author(s):  
Paweł Komorowski ◽  
Patrycja Czerwińska ◽  
Mateusz Kaluza ◽  
Mateusz Surma ◽  
Przemysław Zagrajek ◽  
...  
Keyword(s):  
Frequency Division Multiplexing ◽  
Diffractive Optical Elements ◽  
Frequency Division ◽  
Terahertz Waves ◽  
Optical Elements ◽  
Telecommunication Systems ◽  
Wide Range ◽  
The Future ◽  
Wireless Telecommunication ◽  
Finite Distance

Recently, one of the most commonly discussed applications of terahertz radiation is wireless telecommunication. It is believed that the future 6G systems will utilize this frequency range. Although the exact technology of future telecommunication systems is not yet known, it is certain that methods for increasing their bandwidth should be investigated in advance. In this paper, we present the diffractive optical elements for the frequency division multiplexing of terahertz waves. The structures have been designed as a combination of a binary phase grating and a converging diffractive lens. The grating allows for differentiating the frequencies, while the lens assures separation and focusing at the finite distance. Designed structures have been manufactured from polyamide PA12 using the SLS 3D printer and verified experimentally. Simulations and experimental results are shown for different focal lengths. Moreover, parallel data transmission is shown for two channels of different carrier frequencies propagating in the same optical path. The designed structure allowed for detecting both signals independently without observable crosstalk. The proposed diffractive elements can work in a wide range of terahertz and sub-terahertz frequencies, depending on the design assumptions. Therefore, they can be considered as an appealing solution, regardless of the band finally used by the future telecommunication systems.

scholarly journals Nanooptical elements for visual verification

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alexander Goncharsky ◽  
Anton Goncharsky ◽  
Dmitry Melnik ◽  
Svyatoslav Durlevich
Keyword(s):  
Electron Beam ◽  
Electron Beam Lithography ◽  
Mass Production ◽  
Optical Element ◽  
Visual Image ◽  
Zero Order ◽  
Diffractive Optical Elements ◽  
Optical Elements ◽  
Standard Equipment ◽  
Diffractive Element

AbstractThis paper focuses on the development of flat diffractive optical elements (DOEs) for protecting banknotes, documents, plastic cards, and securities against counterfeiting. A DOE is a flat diffractive element whose microrelief, when illuminated by white light, forms a visual image consisting of several symbols (digits or letters), which move across the optical element when tilted. The images formed by these elements are asymmetric with respect to the zero order. To form these images, the microrelief of a DOE must itself be asymmetric. The microrelief has a depth of ~ 0.3 microns and is shaped with an accuracy of ~ 10–15 nm using electron-beam lithography. The DOEs developed in this work are securely protected against counterfeiting and can be replicated hundreds of millions of times using standard equipment meant for the mass production of relief holograms.

scholarly journals Mobile snapshot hyperspectral imaging device for skin evaluation using diffractive optical elements

2021 ◽  
Author(s):  
Christian Kern ◽  
Uwe Speck ◽  
Rainer Riesenberg ◽  
Carina Reble ◽  
Georg Khazaka ◽  
...  
Keyword(s):  
Hyperspectral Imaging ◽  
Diffractive Optical Elements ◽  
Optical Elements ◽  
Imaging Device
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