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Opportunities for photochromism: rewritable optical elements, holograms and concept devices

Event

Title:
Opportunities for photochromism: rewritable optical elements, holograms and concept devices
When:
Lun, 27. Enero 2020, 15:00 h
Where:
Institut Català de Nanociència i Nanotecnologia (I - Bellaterra (Barcelona)
Category:
Seminarios
Created by:
Sabela Rei

Description

Opportunities for photochromism: rewritable optical elements, holograms and concept devices

Dr Chiara Bertarelli, Politecnico di Milano, Dipartimento di Chimica, Materiali e Ingegneria Chimica ‘Giulio Natta’/ Center for Nano Science and Technology, Milano, Italy

The colour change is the eye-sighted consequence of the molecular isomerization in photochromic materials. Nevertheless, the photochromic process is accompanied by significant modifications of other features such as dipole moment, refractive index, redox potential, conductivity, luminescence etc.. These switching properties can be exploited for a number of applications in imaging, life science or pharmacology, and to develop optical and optoelectronic devices. Here, opportunities to apply photochromism in smart optics are highlighted, where the light-triggered switching in UV–vis absorption and in the refractive index of 1,2- diarylethenes is exploited to develop rewritable optical elements, specifically tunable masks, amplitude and phase holograms and volume gratings. Moreover, the switching of the dipole moment or the conductivity further opens to unusual applications, such as a photochromic electret.

We show that the description of the configuration and the theoretical efficiency of the devices is a relevant issue to be considered in the material design. Furthermore, through a kinetic model that allows to predict or monitor the degree of conversion through the volume of a photochromic layer, we pointed out that the actual coloration of a photochromic material at the solid state strongly depends on the absorption of the illumination wavelength not only of the uncoloured form but also of the colored form. The conversion kinetics in a photochromic system can be described even under complex illumination conditions, and applied to lithography. We determined the influence of the material characteristics on the confinement to subdiffraction dimensions of the transmitted dose, to finally produce patterned surfaces through in Absorbance Modulation Optical Lithography (AMOL).


Venue

Location:
Institut Català de Nanociència i Nanotecnologia (I - Website
Street:
Campus UAB, edifici ICN2
ZIP:
08193
City:
Bellaterra (Barcelona)

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