skip to content

Yusuf Hamied Department of Chemistry

Portrait of sv319

Professor of Chemistry and Bio-materials

Photonic structures in Nature and Bio-mimetic Materials

Research Interests

Photonic structures in nature

Colour in nature is everywhere: animals and plants develop structures on sub-micrometer scale to manipulate light and to obtain brilliant and iridescent colours. This kind of colouration, named structural since it is not obtained using pigmentation, results from various mechanisms, including multilayered materials, crystalline inclusions and surface diffraction gratings. Pollia condensata fruits are one of the most striking examples of  strong iridescent colouration in plants. The colour is caused by Bragg-reflection of helicoidally stacked cellulose microfibrils, which form multilayers in the cell walls of the epicarp. The bright blue colour of this fruit is more intense than that of many previously described biological materials. Uniquely in nature, the reflected colour differs from cell to cell, as the layer thicknesses in the multilayer stack vary, giving the fruit a striking pixelated or ’pointillist’ appearance.

PNAS 109, 15712–15715, (2012)

Another striking example is the white of the Cyphochilus beetle which is native to South-East Asia, is whiter than paper, thanks to ultra-thin scales which cover its body. A new investigation of the optical properties of these scales has shown that they are able to scatter light more efficiently than any other biological tissue known, which is how they are able to achieve such a bright whiteness.

Scientific Reports 4, 6075 doi:10.1038/srep06075 (2014)


  1. BBSRC David Phillips fellowship
  2. Next Generation fellowship
  3. Isaac Newton Trust

Watch Professor Vignolini discuss her research

Selected Publications

[1] Pointillist structural colour in Pollia fruit

S. Vignolini, P. J. Rudall, A. V. Rowland, A. Reed, E. Moyroud, R. B. Faden, J. J. Baumberg, B. J. Glover, U. Steiner; PNAS 109, 15712–15715, (2012). 

[2] Controlled bio-inspired self-assembly of cellulose-based chiral reflectors 

A. G. Dumanli, G. Kamita, J. Landman, H. van der Kooij, B. J. Glover, J. J. Baumberg, U Steiner, S. Vignolini;  Adv. Opt. Mat. DOI: 10.1002/adom.201400112  (2014)

[3]Bright-White Beetle scales Optimise Multiple Scattering of Light

M. Burresi, L. Cortese, L. Pattelli, M. Kolle, P.Vukusic, D. Wiersma, U. Steiner, and S.Vignolini; Scientific Reports 4, 6075 doi:10.1038/srep06075 (2014)



Modeling the cholesteric pitch of apolar cellulose nanocrystal suspensions using a chiral hard-bundle model
M Chiappini, S Dussi, B Frka-Petesic, S Vignolini, M Dijkstra
– The Journal of Chemical Physics
Effect of thermal treatments on chiral nematic cellulose nanocrystal films.
G Guidetti, B Frka-Petesic, AG Dumanli, WY Hamad, S Vignolini
– Carbohydrate Polymers
Large-scale fabrication of structurally coloured cellulose nanocrystal films and effect pigments.
BE Droguet, H-L Liang, B Frka-Petesic, RM Parker, MFL De Volder, JJ Baumberg, S Vignolini
– Nature Materials
Microcavity-Like Exciton-Polaritons can be the Primary Photoexcitation in Bare Organic Semiconductors
R Pandya, RYS Chen, Q Gu, J Sung, C Schnedermann, OS Ojambati, R Chikkaraddy, J Gorman, G Jacucci, OD Onelli, T Willhammar, DN Johnstone, SM Collins, PA Midgley, F Auras, T Baikie, R Jayaprakash, F Mathevet, R Soucek, M Du, AM Alvertis, A Ashoka, S Vignolini, DG Lidzey, JJ Baumberg, RH Friend, T Barisien, L Legrand, AW Chin, J Yuen-Zhou, SK Saikin, P Kukura, AJ Musser, A Rao
– Nature communications
Recent Advances in Block Copolymer Self-Assembly for the Fabrication of Photonic Films and Pigments
Z Wang, CLC Chan, TH Zhao, RM Parker, S Vignolini
– Advanced Optical Materials
Mechanochromic, Structurally Colored and Edible Hydrogels prepared from Hydroxypropyl Cellulose and Gelatin
CH Barty-King, CLC Chan, RM Parker, MM Bay, R Vadrucci, M De Volder, S Vignolini
– Advanced Materials
Synthetic algal-bacteria consortia for space-efficient microalgal growth in a simple hydrogel system
N Martin, T Bernat, J Dinasquet, A Stofko, A Damon, DD Deheyn, F Azam, JE Smith, MP Davey, AG Smith, S Vignolini, D Wangpraseurt
– Journal of Applied Phycology
Interplay between order and disorder in natural photonic structures
L Schertel, G Jacucci, G Theodora Van De Kerhof, S Vignolini
– 2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021
Microcavity-Like Exciton-Polaritons can be the Primary Photoexcitation in Bare Organic Semiconductors
A Rao, R Pandya, R Chen, Q Gu, J Sung, C Schnedermann, O Ojambati, R Chikkaraddy, J Gorman, G Jacucci, O Onelli, T Willhammar, D Johnstone, S Collins, P Midgley, F Auras, T Baikie, R Jayaprakash, F Mathevet, R Soucek, M Du, A Alvertis, A Ashoka, S Vignolini, D Lidzey, J Baumberg, R Friend, T Barisien, L Legrand, A Chin, J Yuen-Zhou, S Saikin, P Kukura, A Musser
Using structural colour to track length scale of cell-wall layers in developing Pollia japonica fruits.
R Middleton, E Moyroud, B Glover, S Vignolini
– The New phytologist
  • <
  • 3 of 17
  • >

Research Group

Research Interest Groups

Telephone number

01223 761490 (shared)

Email address