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Dr Nicholas Roberts
Dr Nicholas Roberts
MPhys (Manc), PhD(Manc)
Area of research
Detection of light and colour in nature
My research is focused on investigating optical mechanisms that underlie sensory abilities such as polarization vision and the evolution of the bio-optics of signaling and photoreception.
My work adopts a broad intra- and inter-disciplinary approach, using a combination of physics based techniques (microspectrophotometry, laser tweezing, optical modelling and X-ray scattering) and behavioural studies (operant conditioning and novel optomotor techniques). Ultimately, I want to understand how visual information helps guide aspects of animal behaviour.
I gained my first degree, an MPhys in Physics and Astrophysics, in 1999 at the University of Manchester. I stayed on in Manchester and completed a PhD in the Liquid Crystal Physics Group with Prof Helen Gleeson in 2003. The focus of my work was on optical studies of model biological liquid crystal systems relating to vertebrate photoreceptors. During my PhD, I conducted much of my biological research at University of Victoria, BC, Canada. After a year as a post-doc back in Manchester, I was awarded a Leverhulme Trust Early Career fellowship to conduct research on vertebrate polarization vision. In 2006, I was awarded an EPSRC Life Science Interface fellowship to work on optical design in vertebrate and invertebrate visual systems, splitting my time between the new Photon Science Institute at Manchester and Queens University in Canada. In Oct 2009, I started a 5 year BBSRC David Philips Fellowship based in the Ecology of Vision Group here at Bristol.
Activities / Findings
- Polarization vision.
- Vision in the deep sea – how photoreceptors work under pressure.
- The physiological optics of rods and cones.
- Animals that manipulate polarized light.
- The evolution of silver reflectors.
- The evolution of polarization signals.
- Optics of oil droplets.
- polarisation vision
- behavioural techniques
- laser tweezing
- optical modelling
- X-ray scattering
- Jordan, TM, Partridge, JC & Roberts, NW 2012, Non-polarizing broadband multilayer reflectors in fish. Nature Photonics, vol 6., pp. 759-763
- Roberts, N, T-S, C, N.J., M & T.W., C 2009, A biological quarter-wave retarder with excellent achromaticity in the visible wavelength region. Nature Photonics, vol 3., pp. 641 - 644
- Temple, S, Pignatelli, V, Cook, T, How, MJ, Chiou, T-S, Roberts, N & Marshall, N 2012, High-resolution polarisation vision in a cuttlefish. Current Biology, vol 22., pp. R121 - R122
- Grigorenko, A, Roberts, N, Dickinson, M & Zhang, Y 2008, Nanometric optical tweezers based on nanostructured substrates. Nature Photonics, vol 2., pp. 365 - 370
- Roberts, N, Porter, M & Cronin, T 2011, The molecular basis of mechanisms underlying polarization vision. Philosophical Transactions of the Royal Society B: Biological Sciences, vol 366., pp. 627 - 637
- Jewell, S, Vukusic, P & Roberts, N 2007, Circularly polarized color reflection in the beetle Plusiotis boucardi. New Journal Physics, vol 9., pp. 99
Read more >
- Enright, JM, Toomey, MB, Sato, Temple, S, Allen, JR, Fujiwara, R, Kramlinger, VM, Nagy, LD, Johnson, KM, Xiao, Y, How, M, Johnson, SL, Roberts, N, Kefalov, VJ, Guengerich, P & Corbo, J 2015, Cyp27c1 red-shifts the spectral sensitivity of photoreceptors by converting vitamin A1 to A2. Current Biology, vol 25., pp. 1-10
- How, M, Christy, J, Temple, S, Hemmi, JM, Marshall, NJ & Roberts, N 2015, Target detection is enhanced by polarization vision in a fiddler crab. Current Biology.
- Sharkey, C, Partridge, J & Roberts, N 2015, Polarization sensitivity as a visual contrast enhancer in the Emperor 1 dragonfly larva,Anax imperator (Leach, 1815). The Journal of Experimental Biology.
- Wilby, D, Toomey, M, Olsson, P, Frederiksen, R, Cornwall, C, Oulton, R, Kelber, A, Corbo, J & Roberts, N 2015, Optics of cone photoreceptors in the chicken (Gallus gallus domesticus). Journal of the Royal Society Interface, vol 12.
Networks & contacts
- Prof Thomas Cronin (UMBC)
- Prof Justin Marshall (Uni Queensland)
- Prof Joe Corbo (WUSTL)
- Prof Almut Kelber (Lund)
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