scholarly journals Birefringence improvement in azopolymer doped with MFI zeolite nanoparticles

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Dimana Nazarova ◽  
Lian Nedelchev ◽  
Svetlana Mintova
Keyword(s):  
Composite Materials ◽  
High Efficiency ◽  
Inorganic Nanoparticles ◽  
Inorganic Materials ◽  
Side Chain ◽  
Holographic Recording ◽  
Diffractive Optical Elements ◽  
Mfi Zeolite ◽  
Optical Elements ◽  
Type Zeolite

AbstractHybrid organic/inorganic materials based on combination of polymers and inorganic nanoparticles (NP) attract considerable attention due to their advantageous electrical, optical, or mechanical properties. Recently it was reported that doping photopolymers with nanoparticles allows to achieve near 100% net diffraction efficiency in case of conventional holographic recording. Thus, we have synthesized novel organic/inorganic composite materials by incorporating MFI (Mordenite Framework Inverted) type zeolite nanoparticles in an amorphous side-chain azopolymer. A considerable improvement of the photoresponse in thin films of these composite materials has been observed compared to the non-doped samples - nearly 25% increase of the saturated value of the birefringence.Moreover the photoinduced birefringence is stable in time which allows these materials to be used as media for diffractive optical elements with high efficiency and unique polarization properties.

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.

Novel continuously shaped diffractive optical elements enable high efficiency beam shaping

2010 ◽  
Author(s):  
Yuri V. Miklyaev ◽  
Waleri Imgrunt ◽  
Vladimir S. Pavelyev ◽  
Denis G. Kachalov ◽  
Tanja Bizjak ◽  
...  
Keyword(s):  
High Efficiency ◽  
Beam Shaping ◽  
Diffractive Optical Elements ◽  
Optical Elements

scholarly journals Compositional Changes for Reduction of Polymerisation-Induced Shrinkage in Holographic Photopolymers

2016 ◽  
Vol 2016 ◽  
pp. 1-11
Author(s):  
D. Cody ◽  
M. Moothanchery ◽  
E. Mihaylova ◽  
V. Toal ◽  
S. Mintova ◽  
...  
Keyword(s):  
Data Storage ◽  
Holographic Recording ◽  
Holographic Data Storage ◽  
Compositional Change ◽  
Monomer Molecule ◽  
Optical Elements ◽  
Interferometric Technique ◽  
Type Zeolite ◽  
Compositional Changes ◽  
Acrylamide Monomer

Polymerisation-induced shrinkage is one of the main reasons why many photopolymer materials are not used for certain applications including holographic optical elements and holographic data storage. Here, two compositional changes for the reduction of shrinkage in an acrylamide-based photopolymer are reported. A holographic interferometric technique was used to study changes in the dynamics of the shrinkage processes occurring in the modified photopolymer during holographic recording in real time. Firstly, the effect of the replacement of the acrylamide monomer in the photopolymer composition with a larger monomer molecule, diacetone acrylamide, on polymerisation-induced shrinkage has been studied. A reduction in relative shrinkage of 10–15% is obtained using this compositional change. The second method tested for shrinkage reduction involved the incorporation of BEA-type zeolite nanoparticles in the acrylamide-based photopolymer. A reduction in relative shrinkage of 13% was observed for acrylamide photopolymer layers doped with 2.5% wt. BEA zeolites in comparison to the undoped photopolymer.

Simple and universal method in designs of high-efficiency diffractive optical elements for spectrum separation and beam concentration

2017 ◽  
Vol 26 (7) ◽  
pp. 074202
Author(s):  
Wen-Qi Xu ◽  
Dong-Feng Lin ◽  
Xin Xu ◽  
Jia-Sheng Ye ◽  
Xin-Ke Wang ◽  
...  
Keyword(s):  
High Efficiency ◽  
Universal Method ◽  
Diffractive Optical Elements ◽  
Optical Elements

High quality diffractive optical elements (DOEs) using SMILE imprint technique

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Simon Drieschner ◽  
Fabian Kloiber ◽  
Marc Hennemeyer ◽  
Jan J. Klein ◽  
Manuel W. Thesen
Keyword(s):  
Soft Lithography ◽  
High Efficiency ◽  
Low Cost ◽  
Industrial Applications ◽  
Diffractive Optical Elements ◽  
Large Area ◽  
High Quality ◽  
Optical Elements ◽  
Uv Curable ◽  
Aspect Ratios

Abstract Augmented reality (AR) enhancing the existing natural environment by overlaying a virtual world is an emerging and growing market and attracts huge commercial interest into optical devices which can be implemented into head-mounted AR equipment. Diffractive optical elements (DOEs) are considered as the most promising candidate to meet the market’s requirements such as compactness, low-cost, and reliability. Hence, they allow building alternatives to large display headsets for virtual reality (VR) by lightweight glasses. Soft lithography replication offers a pathway to the fabrication of large area DOEs with high aspect ratios, multilevel features, and critical dimensions below the diffractive optical limit down to 50 nm also in the scope of mass manufacturing. In combination with tailored UV-curable photopolymers, the fabrication time can be drastically reduced making it very appealing to industrial applications. Here, we illustrate the key features of high efficiency DOEs and how the SMILE (SUSS MicroTec Imprint Lithography Equipment) technique can be used with advanced imprint photopolymers to obtain high quality binary DOEs meeting the market’s requirements providing a very versatile tool to imprint both nano- and microstructures.

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