Research Associate

It is impossible to observe all the bright and brilliant colours in nature without demanding explanation! My research focuses on understanding the optical mechanisms governing colouration in natural photonics and biomimetic ditto. My work takes outset in Maxwell's equations from which light propagation and interaction is studied. This involves numerical simulations using FEM, FDTD and the transfer matrix method for multilayers and spherical particles. Theories not directly complying with Maxwell's equations like radiative transfer and scalar diffraction theory are also used when appropriate.

At the moment I work on understanding light reflection from flower petals and bacteria formations.

 

 

Publications

Structural colours in the frond of Microsorum thailandicum
LM Steiner, Y Ogawa, VE Johansen, CR Lundquist, H Whitney, S Vignolini
Interface Focus
(2019)
9
Unexpected stability of aqueous dispersions of raspberry-like colloids.
Y Lan, A Caciagli, G Guidetti, Z Yu, J Liu, V Johansen, M Kamp, C Abell, S Vignolini, O Scherman, E Eiser
Nat Commun
(2018)
9
Photonics in Nature: From Order to Disorder
VE Johansen, OD Onelli, LM Steiner, S Vignolini
(2018)
10
Genetic manipulation of structural color in bacterial colonies.
VE Johansen, L Catón, R Hamidjaja, E Oosterink, BD Wilts, TS Rasmussen, MM Sherlock, CJ Ingham, S Vignolini
Proc Natl Acad Sci U S A
(2018)
115
Topology optimization of microwave waveguide filters
N Aage, V Egede Johansen
International Journal for Numerical Methods in Engineering
(2017)
112
Reproducing the hierarchy of disorder for Morpho-inspired, broad-angle color reflection.
B Song, VE Johansen, O Sigmund, JH Shin
Sci Rep
(2017)
7
Simulation of reflectance from white-anodised aluminium surfaces using polyurethane–TiO2 composite coatings
VC Gudla, VE Johansen, S Canulescu, J Schou, R Ambat
Journal of Materials Science
(2015)
50
Designing visual appearance using a structured surface
VE Johansen, LH Thamdrup, K Smistrup, T Nielsen, O Sigmund, P Vukusic
Optica
(2015)
2
Preparing the generalized Harvey-Shack rough surface scattering method for use with the discrete ordinates method
VE Johansen
Journal of the Optical Society of America. A, Optics, image science, and vision
(2015)
32
Appearance of anodised aluminium: Effect of alloy composition and prior surface finish
M Aggerbeck, S Canulescu, K Dirscherl, VE Johansen, S Engberg, J Schou, R Ambat
Surface and Coatings Technology
(2014)
254

Postdoctoral researcher