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Dr Flynn Castles

Flynn CastlesPhD, Engineering, University of Cambridge

Lecturer in the Antennas & Electromagnetics Group
Leadership Team Member

School of Electronic Engineering and Computer Science
Eng E205
+44 (0)20 7882 5331

www.eecs.qmul.ac.uk/profiles/castlesflynn.html

Research

polymer composites, metamaterials, liquid crystals, active materials

Research Interests

Publications

 CASTLES F (2016). Microwave dielectric characterisation of 3D-printed BaTiO3/ABS polymer composites. 
10.1038/srep22714
 
CASTLES F (2014). Stretchable liquid-crystal blue-phase gels. 
10.1038/nmat3993

Publications of specific relevance to Materials Research

Publications

2020

  • Castles F, Fells JAJ, Isakov D, Morris SM, Watt AAR and Grant PS (2020). Active Metamaterials with Negative Static Electric Susceptibility. Wiley  Advanced Materials  1904863-1904863. 10.1002/adma.201904863

2017

  • Isakov D, Stevens CJ, Castles F and Grant PS (2017). A Split Ring Resonator Dielectric Probe for Near-Field Dielectric Imaging. Scientific Reports  vol. 7, (1) 10.1038/s41598-017-02176-3

2016

  • Isakov D, Stevens CJ, Castles F and Grant PS (2016). 3D-Printed High Dielectric Contrast Gradient Index Flat Lens for a Directive Antenna with Reduced Dimensions. Advanced Materials Technologies  vol. 1, (6) 10.1002/admt.201600072
  • Isakov DV, Lei Q, Castles F, Stevens CJ, Grovenor CRM and Grant PS (2016). 3D printed anisotropic dielectric composite with meta-material features. Materials and Design  vol. 93, 423-430. 10.1016/j.matdes.2015.12.176
  • CASTLES F (2016). Microwave dielectric characterisation of 3D-printed BaTiO3/ABS polymer composites. Nature Publishing Group  Scientific Reports  10.1038/srep22714
  • Wood SM, Castles F, Elston SJ and Morris SM (2016). Wavelength-tuneable laser emission from stretchable chiral nematic liquid crystal gels via in situ photopolymerization. Rsc Advances  vol. 6, (38) 31919-31924. 10.1039/c6ra05024g

2015

  • Castles F (2015). Linear electro-optic effects due to high-order spatial dispersion. Physical Review a - Atomic, Molecular, and Optical Physics  vol. 92, (6) 10.1103/PhysRevA.92.063804
  • Castles F (2015). A model for the Pockels effect in distorted liquid crystal blue phases. Applied Physics Letters  vol. 107, (10) 10.1063/1.4930579
  • Grant PS, Castles F, Lei Q, Wang Y, Janurudin JM, Isakov D, Speller S, Dancer C and Grovenor CRM (2015). Manufacture of electrical and magnetic graded and anisotropic materials for novel manipulations of microwaves. Philosophical Transactions of The Royal Society a: Mathematical, Physical and Engineering Sciences  vol. 373, (2049) 10.1098/rsta.2014.0353

2014

  • CASTLES F (2014). Stretchable liquid-crystal blue-phase gels. Nature Publishing Group  Nature Materials  vol. 13, 817-821. 10.1038/nmat3993
  • Lorenz A, Gardiner DJ, Morris SM, Castles F, Qasim MM, Choi SS, Kim WS, Coles HJ and Wilkinson TD (2014). Electrical addressing of polymer stabilized hyper-twisted chiral nematic liquid crystals with interdigitated electrodes: Experiment and model. Applied Physics Letters  vol. 104, (7) 10.1063/1.4865558

2013

  • Wood SM, Mavrogordatos TK, Morris SM, Hands PJW, Castles F, Gardiner DJ, Atkinson KL, Coles HJ and Wilkinson TD (2013). Adaptive holographic pumping of thin-film organic lasers. Optics Letters  vol. 38, (21) 4483-4486. 10.1364/OL.38.004483
  • Morris SM, Qasim MM, Cheng KT, Castles F, Ko DH, Gardiner DJ, Nosheen S, Wilkinson TD, Coles HJ, Burgess C and Hill L (2013). Optically activated shutter using a photo-tunable short-pitch chiral nematic liquid crystal. Applied Physics Letters  vol. 103, (10) 10.1063/1.4818679
  • Ko DH, Morris SM, Lorenz A, Castles F, Butt H, Gardiner DJ, Qasim MM, Wallikewitz B, Hands PJW, Wilkinson TD, Amaratunga GAJ, Coles HJ and Friend RH (2013). A nano-patterned photonic crystal laser with a dye-doped liquid crystal. Applied Physics Letters  vol. 103, (5) 10.1063/1.4816243
  • Castles F (2013). Liquid crystal research highlights. Liquid Crystals Today  vol. 22, (1) 17-18. 10.1080/1358314X.2013.813726
  • Morris SM, Qasim MM, Gardiner DJ, Hands PJW, Castles F, Tu G, Huck WTS, Friend RH and Coles HJ (2013). Liquid crystalline chromophores for photonic band-edge laser devices. Optical Materials  vol. 35, (5) 837-842. 10.1016/j.optmat.2012.10.046
  • Castles F, Morris SM and Coles HJ (2013). Response to comment on 'The limits of flexoelectricity in liquid crystals' [AIP Advances 3, 019101 (2013)]. Aip Advances  vol. 3, (1) 10.1063/1.4774286

2012

  • Atkinson KL, Morris SM, Qasim MM, Castles F, Gardiner DJ, Hands PJW, Choi SS, Kim WS and Coles HJ (2012). Increasing the flexoelastic ratio of liquid crystals using highly fluorinated ester-linked bimesogens. Physical Chemistry Chemical Physics  vol. 14, (47) 16377-16385. 10.1039/c2cp43535g
  • Castles F (2012). Liquid crystal research highlights. Liquid Crystals Today  vol. 21, (3) 74-75. 10.1080/1358314X.2012.720456
  • Castles F (2012). Liquid crystal research highlights. Liquid Crystals Today  vol. 21, (4) 81-82. 10.1080/1358314X.2012.773609
  • Mavrogordatos TK, Morris SM, Castles F, Hands PJW, Ford AD, Coles HJ and Wilkinson TD (2012). Density of photon states in dye-doped chiral nematic liquid crystal cells in the presence of losses and gain. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics  vol. 86, (1) 10.1103/PhysRevE.86.011705
  • Castles F, Green SC, Gardiner DJ, Morris SM and Coles HJ (2012). Flexoelectric coefficient measurements in the nematic liquid crystal phase of 5CB. Aip Advances  vol. 2, (2) 10.1063/1.4723681
  • Castles F (2012). Liquid crystal research highlights. Liquid Crystals Today  vol. 21, (2) 49-50. 10.1080/1358314X.2012.673913
  • Gardiner DJ, Morris SM, Hands PJW, Castles F, Qasim MM, Kim WS, Choi SS, Wilkinson TD and Coles HJ (2012). Spontaneous induction of the uniform lying helix alignment in bimesogenic liquid crystals for the flexoelectro-optic effect. Applied Physics Letters  vol. 100, (6) 10.1063/1.3682305
  • Atkinson KL, Morris SM, Castles F, Qasim MM, Gardiner DJ and Coles HJ (2012). Flexoelectric and elastic coefficients of odd and even homologous bimesogens. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics  vol. 85, (1) 10.1103/PhysRevE.85.012701
  • Castles F, Day FV, Morris SM, Ko DH, Gardiner DJ, Qasim MM, Nosheen S, Hands PJW, Choi SS, Friend RH and Coles HJ (2012). Blue-phase templated fabrication of three-dimensional nanostructures for photonic applications. Nature Materials  vol. 11, (7) 599-603. 10.1038/nmat3330
  • Castles F (2012). Liquid crystal research highlights. Liquid Crystals Today  vol. 21, (1) 27-28. 10.1080/1358314X.2012.656398

2011

  • Morris SM, Gardiner DJ, Castles F, Hands PJW, Wilkinson TD and Coles HJ (2011). Fast-switching phase gratings using in-plane addressed short-pitch polymer stabilized chiral nematic liquid crystals. Applied Physics Letters  vol. 99, (25) 10.1063/1.3670041
  • Castles F, Morris SM and Coles HJ (2011). The limits of flexoelectricity in liquid crystals. Aip Advances  vol. 1, (3) 10.1063/1.3624725
  • Gardiner DJ, Morris SM, Castles F, Qasim MM, Kim WS, Choi SS, Park HJ, Chung IJ and Coles HJ (2011). Polymer stabilized chiral nematic liquid crystals for fast switching and high contrast electro-optic devices. Applied Physics Letters  vol. 98, (26) 10.1063/1.3605597

2010

  • Castles F, Morris SM, Terentjev EM and Coles HJ (2010). Thermodynamically stable blue phases. Physical Review Letters  vol. 104, (15) 10.1103/PhysRevLett.104.157801
  • Castles F, Morris SM, Gardiner DJ, Malik QM and Coles HJ (2010). Ultra-fast-switching flexoelectric liquid-crystal display with high contrast. Journal of The Society For Information Display  vol. 18, (2) 128-133. 10.1889/JSID18.2.128

2009

  • Choi SS, Castles F, Morris SM and Coles HJ (2009). High contrast chiral nematic liquid crystal device using negative dielectric material. Applied Physics Letters  vol. 95, (19) 10.1063/1.3248219
  • Castles F, Morris SM and Coles HJ (2009). Flexoelectro-optic properties of chiral nematic liquid crystals in the uniform standing helix configuration. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics  vol. 80, (3) 10.1103/PhysRevE.80.031709