Dr Villads Egede Johansen | Bio-inspired Photonics

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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

– Journal of the Royal Society Interface

(2019)

9,

20180055

(doi: 10.1098/rsfs.2018.0055)

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

– Nature Communications

(2018)

9,

3614

(doi: 10.1038/s41467-018-05560-3)

Photonics in Nature: From Order to Disorder

VE Johansen, OD Onelli, LM Steiner, S Vignolini

(2018)

10,

53

(doi: 10.1007/978-3-319-74144-4_3)

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,

2652

(doi: 10.1073/pnas.1716214115)

Topology optimization of microwave waveguide filters

N Aage, V Egede Johansen

– International Journal for Numerical Methods in Engineering

(2017)

112,

283

(doi: 10.1002/nme.5551)

Reproducing the hierarchy of disorder for Morpho-inspired, broad-angle color reflection

B Song, VE Johansen, O Sigmund, JH Shin

– Scientific Reports

(2017)

7,

46023

(doi: 10.1038/srep46023)

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,

4565

(doi: 10.1007/s10853-015-9005-1)

Designing visual appearance using a structured surface

VE Johansen, LH Thamdrup, K Smistrup, T Nielsen, O Sigmund, P Vukusic

– Optica

(2015)

2,

239

(doi: 10.1364/OPTICA.2.000239)

Preparing the generalized Harvey-Shack rough surface scattering method for use with the discrete ordinates method.

VE Johansen

– J Opt Soc Am A Opt Image Sci Vis

(2015)

32,

186

(doi: 10.1364/josaa.32.000186)

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,

28

(doi: 10.1016/j.surfcoat.2014.05.047)