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  4. Microlenses on Bragg Reflectors to Create Iridescent Colors
 
research article

Microlenses on Bragg Reflectors to Create Iridescent Colors

Scharf, Toralf  
•
Jaquet, Sylvain
•
Ruffieux, Patrick  
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2008
Japanese Journal of Applied Physics

In nature strong colors play an important role in scaring away predators or finding a mate. Often, the strongest and brightest colors arise from coherent scattering and reflection on periodic structures on a length scale of several micro- or nanometers. Until recently, many theoretical combinations of diffractive structure and interference layers have been investigated and nearly nothing has been done on combinations of refractive structures and multilayer interferences. Only a few realizations have been achieved. We constructed and studied optical systems that mimic nature and are fabricated completely from organic materials. In this study we concentrate on combinations of Bragg reflectors and microlenses. Fabrication was carried out by spin-coating of organic interference layers and soft replication of microlenses. We studied reflection properties of such structures and discuss herein their behavior under different illumination conditions. To provide deeper insight, a model based on ray tracing is used that allows simulation of main characteristics. Particular optical configurations exist where the reflected color is insensitive to observation angles, while others have only one preferred direction of response.

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Type
research article
DOI
10.1143/JJAP.47.6699
Author(s)
Scharf, Toralf  
Jaquet, Sylvain
Ruffieux, Patrick  
Herzig, Hans Peter  
Date Issued

2008

Published in
Japanese Journal of Applied Physics
Volume

47

Issue

8

Start page

6699

End page

6705

Subjects

iridescent colors

•

structural color

•

organic photonic components

•

microoptics

•

photonic nanostructures

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

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https://infoscience.epfl.ch/handle/20.500.14299/41354
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