Photochromic polyurethanes for rewritable CGHs in optical testing

Pariani, Giorgio; Bertarelli, Chiara; Dassa, Giovanni; Bianco, Andrea; Zerbi, G.

doi:10.1364/oe.19.004536

Cited by 25 publications

(22 citation statements)

References 39 publications

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“…Among photochromic materials, diarylethenes have a special role since they combine high photochromic performances with the thermal stability of the colored state [2]. The variation of both their extinction coefficient (in the UV-Vis spectral region) and their refractive index (in the NIR spectral region) has been applied to develop rewritable optical elements for optics [3,4] including amplitude elements such as computer generated holograms [5,6], transparency masks for lithography [7][8][9], and astronomical multiobject spectroscopy [10].…”

Section: Introductionmentioning

confidence: 99%

Photochromic Polyurethanes Showing a Strong Change of Transparency and Refractive Index

et al. 2017

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Photochromic polymers have been studied as rewritable systems for optical elements with tunable transparency in the visible and refractive index in the NIR. Six diarylethene monomers have been synthesized to give thin films of photochromic polyurethanes. The absorption properties of the monomers in solution and of the corresponding polymeric films have been evaluated showing that a transparency contrast in the visible spectrum of the order of 10 3 can be obtained by a suitable choice of the chemical structure and illumination wavelength. The change in the refractive index in the NIR have been determined by ellipsometry showing changes larger than 10 −2 . A trend of this variation with the absorption properties has been also highlighted. Fresnel lenses working on the basis of both a change of the transparency and the refractive index (amplitude and phase) have been demonstrated.

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Section: Introductionmentioning

confidence: 99%

Photochromic Polyurethanes Showing a Strong Change of Transparency and Refractive Index

et al. 2017

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“…In this framework, photochromic polymers are for sure effective, as recent applications demonstrated [13,31]. On the other hand, issues are still present, mainly regarding the actual possibility to fully exploit the properties these materials possess.…”

Section: Photochromic Materials and Photoconversion Modelmentioning

confidence: 99%

“…In the field of holography, photochromic materials have been considered interesting and extensively studied [7][8][9][10][11][12][13], in particular for the following reasons:…”

Section: Introductionmentioning

confidence: 99%

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Photochromic materials for holography: issues and constraints

Bianco

Pariani

Zanutta

et al. 2012

Practical Holography XXVI: Materials and Applications

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Photochromic materials can find application in holography, thanks to the peculiar possibility to change reversibly their transparency in the visible (amplitude holography) and their refractive index in the near infrared region (phase holography). The main advantages of such materials are rewritability and self-development. A large change of the key property is crucial to obtain efficient devices and some strategies are followed, accordingly. Production of the holograms have open important issues regarding the film thickness and the nonlinear response to light, because of the strong absorption of the writing light by the material. Results related to these topics, mainly focused on diarylethene-based materials, are reported.

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“…Reprinted with permission from AAAS. configuration, the photochromic device makes it possible to write and erase different patterns on the same substrate according to the need [46].…”

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confidence: 99%

Control of optical properties through photochromism: a promising approach to photonics

Bianco

Perissinotto

Garbugli

et al. 2011

Laser & Photonics Reviews

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In this work studies on photochromism for optics and photonics are reviewed. The versatility of organic chemistry gives photochromic materials wide opportunities for several applications that range from tunable filters and gratings, to refractive-index modulators for optical fibers and communications, to optical memories and sensors. Moreover, novel results on efficient modulation of amplified emission in a conjugated polymer/photochromic system are presented. Credit for the background image (WR 25 and Tr16-244, open cluster Trumpler 16): NASA, ESA and Jesús Maíz Apellániz

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Photochromic polyurethanes for rewritable CGHs in optical testing

Cited by 25 publications

References 39 publications

Photochromic Polyurethanes Showing a Strong Change of Transparency and Refractive Index

Photochromic Polyurethanes Showing a Strong Change of Transparency and Refractive Index

Photochromic materials for holography: issues and constraints

Control of optical properties through photochromism: a promising approach to photonics

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