Structural Colors - Engineered Biomimicry - page 294

for various purposes. Nonpigmented colors also
occur with some frequency in nature, both in living
creatures and inanimate objects. These structural
colors are due to both regular and irregular arrays
of scattering elements. Rich hues of structural col-
ors are usually produced collaboratively by sev-
eral physical mechanisms. A good understanding
of these mechanisms and their interplays will help
us in formulating artificial structural colors for
fabrics, paints, cosmetics, and other applications.

[9] P. Vukusic, Structural colour in Lepidoptera, Curr Biol
16 (2006), R621-R623.
[10] A.L. Ingram and A.R. Parker, A review of the diversity
and evolution of photonic structures in butterflies,
incorporating the work of John Huxley (The Natural
History Museum, London, from 1961 to 1990), Phil
Trans R Soc Lond B 363 (2008), 2465-2480.
[11] S. Kinoshita and S. Yoshioka, Structural colors in
nature: the role of regularity and irregularity in the
structure, Chem Phys Chem 6 (2005), 1442-1459.
[12] B.D. Wilts, H.L. Leertouwer, and D.G. Stavenga,
Imaging scatterometry and microspectrophotometry
of lycaenid butterfly wing scales with perforated mul-
tilayers, J R Soc Interf 6 (2009), S185-S192.
[13] A.R. Parker, The diversity and implications of animal
structural colors, J Exp Biol 201 (1998), 2343-2347.
[14] N. Dushkina and A. Lakhtakia, Structural colors, cos-
metics and fabrics, Proc SPIE 7401 (2009), 740106.
[15] T.F. Anderson and A.G. Richards Jr, An electron micro-
scope study of some structural colors in insects, J Appl
Phys 13 (1942), 748-758.
[16] J.C. Downey and A.C. Allyn, Wing-scale morphology
and nomenclature, Bull Allyn Museum 31 , 1-32.
[17] A.C. Allyn and J.C. Downey, Diffraction structures in
the wing scales of Callophrys (Mitoura) siva siva (Lycae-
nidae), Bull Allyn Museum 40 (1976), 1-6.
[18] A.C. Allyn Jr. and J.C. Downey, Observations on male
U-V reflectance and scale ultrastructure in Phoebis
(Pieridae), Bull Allyn Museum 42 (1977), 1-6.
[19] H. Ghiradella, Development of ultraviolet-reflecting
butterfly scales: how to make an interference filter, J
Morphol 142 (1974), 395-409.
[20] H. Ghiradella and W. Radigan, Development of but-
terfly scales. II. Struts, lattices and surface tension, J
Morphol 150 (1976), 279-297.
[21] H. Ghiradella, Structure of iridescent lepidopteran
scales: variations on several themes, Ann Entomol Soc
Am 77 (1984), 637-645.
[22] H. Ghiradella, Structure and development of irides-
cent lepidopteran scales: the papilionidae as a show-
case family, Ann Entomol Soc Am 78 (1986), 252-264.
[23] H. Ghiradella, Structure and development of irides-
cent butterfly scales: lattices and laminae, J Morphol
202 (1989), 69-88.
[24] K. Kumazawa, S. Tanaka, K. Negita, and H. Tabata,
Fluorescence from wing of Morpho sulkowskyi butterfly,
Jpn J Appl Phys 33 (1994), 2119-2122.
[25] S. Kinoshita, Structural colors in the realm of nature ,
World Scientific, Singapore (2008).
[26] S. Kinoshita, S. Yoshioka, Y. Fujii, and N. Okamoto,
Photophysics of structural color in the Morpho but-
terflies, Forma 17 (2002), 103-121.
[27] S. Kinoshita, S. Yoshioka, and K. Kawagoe, Mechanisms
of structural color in the Morpho butterfly: cooperation

Acknowledgments
ND thanks Prof. Kuniaki Nagayama for introducing her to the
field of structural colors and revealing the secrets of the blue
iridescence of the beautiful M. sulkowskyi butterfly, as well as
for leaving his collection of works and materials on the sub-
ject to her. AL thanks the Charles Godfrey Binder Endowment
at Penn State for sustained support of his research activities.
The authors dedicate this chapter to ND's husband, Dr.
Ceco Dushkin, who authored some of the first works on
structural colors from self-assembled particle arrays and
who created and financially supported the Laboratory
of Nanoparticle Science & Technology at the Faculty of
Chemistry, University of Sofia, in 2000, the first and pioneer-
ing laboratory in Bulgaria in this scientific area. Dr. Ceco
Dushkin passed away on May 19, 2011, at the age of 52.

References
[1] D. Lee, Nature's palette: the science of plant colors , Univer-
sity of Chicago Press, Chicago, IL, USA (2007).
[2] W.D. Bancroft, The colors of colloids. VII, J Phys Chem
23 (1919), 365-414.
[3] H. Ghiradella, Light and color on the wing: structural
colors in butterflies and moths, Appl Opt 30 (1991),
3492-3500.
[4] H. Ghiradella, Structure of butterfly scales: patterning
in an insect cuticle, Microsc Res Tech 27 (1994),
429-438.
[5] K. Kumazawa and H. Tabata, Time-resolved fluores-
cence studies of the wings of Morpho sulkowskyi and
Papilio xuthus butterflies, Zool Sci 13 (1996), 843-847.
[6] C.W. Mason, Structural colors in insects. I, J Phys Chem
30 (1926), 383-395.
[7] http://optics.org/cws/article/research/8351
(accessed 1 July 2009).
[8] S. Wickham, M.C.J. Large, L. Poladian, and L.S. Jermiin,
Exaggeration and suppression of iridescence: the evolu-
tion of two-dimensional butterfly structural colours, J
R Soc Interf 3 (2006), 99-109.