Periodic and aperiodic liquid crystal-polymer composite structures realized via spatial light modulator direct holography

Infusino, Melissa; Luca, Antonio De; Barna, V.; Caputo, Roberto; Umeton, Cesare

doi:10.1364/oe.20.023138

Cited by 33 publications

(33 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the last place we have evaluated a photopolymer with dispersed liquid crystal molecules, H-PDLC [23][24][25][26][27] DOEs in the low spatial frequency range. Nowadays new components have been included in the standard formulation of classical photopolymer systems to arise unexpected properties, some examples of these components are nano-particles or dispersed liquid crystal molecules (LC), by combining polymers and dispersed liquid crystals a new spectrum of interesting applications was opened.…”

Section: Introductionmentioning

confidence: 99%

“…The opportunity to design new switchable or tunable holographic displays due to phase separation between photopolymer and LC has attracted great attention. For example, the ability to control the diffraction efficiency of holographic optical elements by applying an electric field leads to the possibility of using holographic optical elements in dynamic applications for agile beam steering, nonlinear optics and optical switching devices [23][24][25]. This family of polymers is known as H-PDLC.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization and comparison of different photopolymers for low spatial frequency recording

et al. 2015

View full text Add to dashboard Cite

a b s t r a c tFree-radical photopolymer materials can be fabricated using a wide range of monomers, binders, dyes, etc. It was shown that in some photopolymers the surface and the internal diffusion for acrylamide materials are very different and also it was demonstrated the viability of acrylamide materials to achieve 2p phase depth for low spatial diffractive optical elements. Building on the work developed previously, in this paper, a characterization and a comparison is carried out for three different photopolymers: crosslinked acrylamide based photopolymers, a biophotopol and an H-PDLC material. We have measured the motion of the components inside the material and through the surface using a new index matching component and through the surface. We have studied the introduction of different crosslinkers in order to increase the refractive index modulation and to reduce the thickness required to achieve a phase depth higher than 2p in the diffraction optical elements.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization and comparison of different photopolymers for low spatial frequency recording

et al. 2015

View full text Add to dashboard Cite

show abstract

“…This intensity pattern is the one that will be recorded on the photopolymeric material converted into a phase element, improved by the inclusion of the LCoS with a pixel size of 8 m as opposed to the transmition of LCD with a pixel size of 44 m used in previous studies. This new spatial light modulation opens up a great number of possibilities such as recording symmetric and asymmetric holographic patterns using a single beam [31] or cylindrical or spherical diffractive lenses [32] as well as greatly improving the resolution of diffractive optical elements [33], as in the case of our study. The devices are exposed to an electrical field in order to evaluate the electro-optical response.…”

Section: Methodsmentioning

confidence: 79%

“…Therefore, the grating develops a dynamic behavior that may be modified by electronic means. In this manner, it is possible to make dynamic devices such as tunable-focus lenses, sensors, phase modulators, or prism gratings [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Influence of the spatial frequency on the diffractive optical elements fabrication in PDLCs

Fernández¹,

Fenoll

Gallego³

et al. 2016

SPIE Proceedings

View full text Add to dashboard Cite

Sponsored and Published by SPIEDownloadedThe papers in this volume were part of the technical conference cited on the cover and title page. Papers were selected and subject to review by the editors and conference program committee. Some conference presentations may not be available for publication. Additional papers and presentation recordings may be available online in the SPIE Digital Library at SPIEDigitalLibrary.org.The papers reflect the work and thoughts of the authors and are published herein as submitted. The publisher is not responsible for the validity of the information or for any outcomes resulting from reliance thereon. Copying of material in this book for internal or personal use, or for the internal or personal use of specific clients, beyond the fair use provisions granted by the U.S. Copyright Law is authorized by SPIE subject to payment of copying fees. The Transactional Reporting Service base fee for this volume is $18.00 per article (or portion thereof), which should be paid directly to the Copyright Clearance Center (CCC), 222 Rosewood Drive, Danvers, MA 01923. Payment may also be made electronically through CCC Online at copyright.com. Other copying for republication, resale, advertising or promotion, or any form of systematic or multiple reproduction of any material in this book is prohibited except with permission in writing from the publisher. The CCC fee code is 0277-786X/16/$18.00.Printed in the United States of America.Publication of record for individual papers is online in the SPIE Digital Library. SPIEDigitalLibrary.orgPaper Numbering: Proceedings of SPIE follow an e-First publication model. A unique citation identifier (CID) number is assigned to each article at the time of publication. Utilization of CIDs allows articles to be fully citable as soon as they are published online, and connects the same identifier to all online and print versions of the publication. SPIE uses a six-digit CID article numbering system structured as follows:The first four digits correspond to the SPIE volume number. The last two digits indicate publication order within the volume using a Base 36 numbering system employing both numerals and letters. These two-number sets start with 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 0A, 0B … 0Z, followed by 10-1Z, 20-2Z, etc. The CID Number appears on each page of the manuscript. 9970 1K Scale estimation of objects using template matching 9970 1L Optical correlation algorithm for reconstructing phase skeleton of complex optical fields 9970 1M Methods of restoring spatial phase distribution of complex optical fields 9970 1N 2D Hilbert transform for phase retrieval of speckle fields 9970 1O Using of microparticles for coherent properties of optical fields diagnosing 1PThe interconnection of degree of coherence and Rayleigh particles velocity motion 9970 1Q Fringe-projection method for three-dimensional digitization of human faces 1SThe analysis of long-wave infrared polarization signal of typical material targets

show abstract

“…[1][2][3][4][5][6][7][8][9][10] The basic idea is very simple: when a mixture of two components, one of which is a photosensitive monomer, is exposed to a light pattern at the appropriate frequency, a polymer is formed in the higher-intensity regions and the passive component will be pushed via diffusion into the darker regions. [1][2][3] The advantages of this technique are: (i) it is a one-step procedure easily integrable in a fabrication line (ii) it is relatively less expensive, compared to RSC This very simple idea hides the much more complex physics on the interplay between photochemistry and diffusion for controlling the key parameters of these two processes (e.g.…”

Section: Introductionmentioning

confidence: 99%

Inhomogeneous Photopolymerization in Multicomponent Media

Veltri

Sukhov

Caputo

et al. 2014

Photocured Materials

Self Cite

View full text Add to dashboard Cite

We present a model for the photoinduced formation of composite materials by means of an inhomogeneous curing pattern. The model assumes that redistribution of molecules is due to mass diffusion and incorporates a realistic kinetic description of polymerization processes. Numerical simulations predict two different kinds of structure that have already been experimentally observed when this procedure was used to produce switchable diffraction gratings in polymer-based liquid-crystalline composite materials. We demonstrate how two parameters, related to diffusion and curing intensity, govern the phenomenon and determine the structure that will be formed after the curing process has been completed.

show abstract

Periodic and aperiodic liquid crystal-polymer composite structures realized via spatial light modulator direct holography

Cited by 33 publications

References 25 publications

Characterization and comparison of different photopolymers for low spatial frequency recording

Characterization and comparison of different photopolymers for low spatial frequency recording

Influence of the spatial frequency on the diffractive optical elements fabrication in PDLCs

Inhomogeneous Photopolymerization in Multicomponent Media

Contact Info

Product

Resources

About