OSA's Digital Library

Spotlight on Optics

Spotlight on Optics

| HIGHLIGHTED ARTICLES FROM OSA JOURNALS

  • October 2012

Optics InfoBase > Spotlight on Optics > Disordered packings of core-shell particles with angle-independent structural colors


Disordered packings of core-shell particles with angle-independent structural colors

Published in Optical Materials Express, Vol. 2 Issue 10, pp.1343-1352 (2012)
by Sofia Magkiriadou, Jin-Gyu Park, Young-Seok Kim, and Vinothan N. Manoharan

Source article Abstract | Full Text: XHTML | Full Text: PDF


Spotlight summary: The brightest colours in nature are obtained in nature by nanostructuring materials on length scales of the order of the light wavelength. Self-assembly techniques that lead the production of such materials allow intense and tunable colours without the use of pigments and dyes.

Sofia Magkiriadou and co-workers demonstrated a simple and costless technique to produce an angle-independent colour. Core-shell colloidal particles consisting of high refractive index core and a soft shell were assembled in a disordered network by centrifugation. Constructive interference between light scattered from the high refractive index core occurs due to short-range correlations in the system. Since the structure is isotropic, the interference condition does not vary with orientation, leading to a colour that is independent of the viewing angle. By varying the distance between the scattering centres, simply by changing the thickness of the soft shells, it is possible to change the resulting colour. A similar mechanism is responsible for the colour of bird feathers.

Such materials may find application in cosmetics or display technology. Structural colour is in fact advantageous with respect to pigments, since it does not fade . Moreover, the fact that the shells respond to changes in temperature and pH lead to the possibility of using such materials for sensing application where a variation of the surrounding environment results in a change of colour of the device.

--Silvia Vignolini



ToC Category: Nanomaterials
OCIS Codes: (330.1690) Vision, color, and visual optics : Color
(160.1245) Materials : Artificially engineered materials
(350.4238) Other areas of optics : Nanophotonics and photonic crystals


Posted on October 19, 2012

Add Comment
You must log in to add comments.





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Previous Spotlights

2014

2013

2012

2011

2010

2009