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Callum Littlejohns

email: C.Littlejohns@soton.ac.uk
tel: +44 23 8059 2697

Research Fellow

Member of groups

About Callum Littlejohns, BEng

Dr Callum Littlejohns completed his PhD in the field of Silicon Photonics at the Optoelectronics Research Centre, University of Southampton in March 2015, having previously obtained a First Class Honours degree in Electronic Engineering at the University of Surrey. He has now begun his career as a Research Fellow at Nanyang Technological University in Singapore, but remains part of the Silicon Photonics group in the Optoelectronics Research Centre as a visitor. He has a track record of excellence, having received multiple awards throughout his academic life, including the Information Overload category winner at the 2015 EPSRC ICT Pioneers Award and the runner-up prize in the Best Student Poster award at the 2014 Optoelectronics Research Centre Photonics Day. His current research is focussed on mid-infrared silicon photonics, including both passive and active device design, fabrication and characterisation. His research has been published in multiple peer-reviewed journals including Scientific Reports, a Nature Publishing Group journal. His work was also selected as a prestigious post-deadline paper at the IEEE Group IV Photonics conference in Paris, 2014. The work completed during Callum’s PhD has been protected by two separate patents, both fully supported by the University of Southampton.

There are 25 publications in ORC database for 'Littlejohns, C.'

  • 7653 —  C.Alonso-Ramos, M.Nedeljković, D.Benediković, J.Soler Penadés, C.Littlejohns, A.Khokhar, D.Perez-Galacho, L.Vivien, P.Cheben, G.MashanovichGermanium-on-silicon mid-infrared grating couplers with low-reflectivity inverse taper excitation
    Optics Letters 2016 Vol.41(18) pp.4324-4327
    [Abstract]
       [ePrint: 404442]
  • 7613 —  G.Mashanovich, C.Mitchell, J.Soler Penadés, A.Khokhar, C.Littlejohns, W.Cao, Z.Qu, S.Stanković, F.Gardes, T.Ben Masaud, H.Chong, V.Mittal, G.S.Murugan, J.S.Wilkinson, A.C.Peacock, M.NedeljkovićGermanium mid-infrared photonic devices
    Journal of Lightwave Technology 2016 pp.1-7
    [Abstract]
       [ePrint: 403096]
  • 7576 —  Ting Hu, H.Qiu, Z.Zhang, X.Guo, C.Liu, M.S.Rouifed, C.Littlejohns, G.Reed, H.WangA compact ultrabroadband polarization beam splitter utilizing a hybrid plasmonic Y-branch
    IEEE Photonics Journal 2016 Vol.8(4) pp.1-10
    [Abstract]
       [ePrint: 400900]
  • 7575 —  Ting Hu, M.S.Rouifed, H.Qiu, X.Guo, C.Littlejohns, C.Liu, H.WangA polarization splitter and rotator based on a partially etched grating-assisted coupler
    IEEE Photonics Technology Letters 2016 Vol.28(8) pp.911-914
    [Abstract]
       [ePrint: 400899]
  • 7407 —  C.Littlejohns, T.Dominguez Bucio, M.Nedeljković, G.Mashanovich, G.T.Reed, F.GardesLocalised tuneable composition single crystal silicon-germanium-on-insulator for low cost devices
    Advances in Materials Science and Engineering 2016 pp.1-17
    [Abstract]
       [ePrint: 394684]
  • 7384 —  C.Littlejohns, S.R.Mohamed, H.Qiu, T.Guo Zin, Ting Hu, T.Dominguez Bucio, M.Nedeljković, G.Mashanovich, G.T.Reed, F.Gardes, H.WangNear- and mid- infrared group IV photonics
    Energy Materials and Nanotechnology Quantum Meeting Phuket, TH 8-11 Apr 2016 (Invited)
    [Abstract]
       [ePrint: 392891]
  • 7304 —  C.Littlejohns, T.Dominguez Bucio, M.Nedeljković, H.Wang, G.Mashanovich, G.T.Reed, F.GardesTowards a fully functional integrated photonic-electronic platform via a single SiGe growth step
    Scientific Reports 2016 Vol.6(19425) pp.1-6
    [Abstract]
       [ePrint: 386625]
  • 7408 —  D.J.Thomson, C.G.Littlejohns, S.Stanković, M.Nedeljković, S.A.ReynoldsSilicon photonics
    Wiley Encyclopedia of Electrical and Electronics Engineering, Wiley Online 2015 pp.1-22
    [Abstract]
       [ePrint: 394672]
  • 7279 —  M.Nedeljković, J.Soler Penadés, C.J.Mitchell, A.Z.Khokhar, S.Stanković, T.D.Bucio, C.G.Littlejohns, F.Y.Gardes, G.Z.MashanovichSurface-Grating-Coupled Low-Loss Ge-on-Si Rib Waveguides and Multimode Interferometers
    IEEE Photonics Technology Letters 2015 Vol.27(10) pp.1040-1043
    [Abstract]
       [ePrint: 385678]
  • 7271 —  G.Z.Mashanovich, M.Nedeljković, J.Soler Penadés, C.J.Mitchell, A.Z.Khokhar, C.J.Littlejohns, S.Stanković, B.Troia, Y.Wang, S.Reynolds, V.M.N.Passaro, L.Shen, N.Healy, A.C.Peacock, C.Alonso-Ramos, A.Ortega-Moñux, G.Wanguemert-Perez, I.Molina-Fernandez, D.J.Rowe, J.S.Wilkinson, P.Cheben, J.J.Ackert, A.P.Knights, D.J.Thomson, F.Y.GardesGroup IV Mid-Infrared Photonics
    SPIE Conference on Silicon Photonics X San Francisco 9-12 Feb 2015 9367 (Invited)
    [Abstract]
       [ePrint: 386076]
  • 7143 —  C.G.Littlejohns, A.Z.Khokhar, D.J.Thomson, Y.Hu, L.Basset, S.A.Reynolds, G.Z.Mashanovich, G.T.Reed, F.Y.GardesGe-on-Si plasma enhanced chemical vapor deposition for low cost photodetectors
    IEEE Photonics Journal 2015 Vol.1-8
    [Abstract]
       [ePrint: 378979]
  • 7126 —  C.G.LittlejohnsSilicon-germanium for photonic applications
    PhD Thesis - 2015
    [Abstract]
       [ePrint: 376480]
  • 7082 —  G.Z.Mashanovich, M.Nedeljković, J.Soler Penadés, C.J.Mitchell, A.Z.Khokhar, C.J.Littlejohns, S.Stanković, B.Troia, Y.Wang, S.Reynolds, V.M.N.Passaro, L.Shen, N.Healy, A.C.Peacock, C.Alonso-Ramos, A.Ortega-Moñux, G.Wanguemert-Perez, I.Molina-Fernandez, D.J.Rowe, J.S.Wilkinson, P.Cheben, J.J.Ackert, A.P.Knights, D.J.Thomson, F.Y.GardesMid-IR group IV photonics
    SPIE Photonics West '15 San Francisco 7-12 Feb 2015 pp.9367-25 (Invited)    [ePrint: 384446]
  • 7079 —  M.Nedeljković, J.Soler Penadés, A.Z.Khokhar, C.J.Mitchell, S.Stanković, T.Dominguez Bucio, C.G.Littlejohns, F.Y.Gardes, G.Z.MashanovichGrating coupled low loss Ge-on-Si waveguides and multimode interferometers for the mid-infrared
    OFC '15 Los Angeles, CA 22-26 Mar 2015    [ePrint: 384448]
  • 6854 —  C.G.Littlejohns, M.Nedeljković, C.F.Mallinson, J.F.Watts, G.Z.Mashanovich, G.T.Reed, F.Y.GardesNext generation device grade silicon-germanium on insulator
    Scientific Reports 2015 Vol.5 Art.No.8288
    [Abstract]
       [ePrint: 375138]
  • 7085 —  G.T.Reed, G.Z.Mashanovich, F.Y.Gardes, D.J.Thomson, Y.Hu, J.Soler Penadés, M.Nedeljković, A.Khokar, P.Thomas, C.Littlejohns, A.Ahmad, S.Reynolds, R.Topley, C.Mitchell, S.Stanković, X.Chen, P.R.Wilson, L.Ke, T.M.Ben Masaud, A.Tarazona, H.ChongSilicon Photonics
    7th International Silicon-Germanium Technology and Device Meeting Singapore 2-4 Jun 2014 (plenary)    [ePrint: 384203]
  • 7083 —  G.T.Reed, Y.Hu, G.Z.Mashanovich, F.Y.Gardes, D.J.Thomson, J.Soler Penadés, M.Nedeljković, A.Khokar, P.Thomas, C.J.Littlejohns, A.Ahmad, S.Reynolds, R.Topley, C.Mitchell, S.Stanković, D.J.Richardson, P.Petropoulos, P.Thomas, P.R.Wilson, L.Ke, T.M.Ben Masaud, A.Tarazona, H.ChongNear infrared and the mid infrared silicon photonic devices
    Nano Korea '14 Symposium Seoul, South Korea 2-4 Jul 2014 (Invited)    [ePrint: 384205]
  • 6853 —  C.G.Littlejohns, M.Nedeljković, G.Z.Mashanovich, G.T.Reed, F.Y.GardesSilicon-germanium composition engineering for next generation multilayer devices and systems
    IEEE 11th International Conference on Group IV Photonics (GFP) Institute of Electrical and Electronics Engineers Paris 27-29 Aug 2014 pp.2
    [Abstract]
       [ePrint: 375141]
  • 6852 —  C.G.Littlejohns, F.Y.Gardes, M.Nedeljković, G.Z.Mashanovich, G.T.ReedSilicon diffusion engineering in rapid melt growth of silicon-germanium on insulator
    The Electrochemical Society (ECS) Transactions 2014 Vol.64(6) pp.155-157
    [Abstract]
       [ePrint: 375140]
  • 6598 —  Y.Hu, C.G.Littlejohns, J.Soler Penadés, A.Z.Khokhar, S.Stanković, S.A.Reynolds, C.J.Mitchell, F.Y.Gardes, D.J.ThomsonMultichannel silicon photonic devices based on angled multimode interferometers
    Photonics North '14 Montréal 28-30 May 2014 (Invited)
    [Abstract]
       [ePrint: 367976]
  • 6593 —  F.Y.Gardes, T.D.Bucio, C.G.Littlejohns, G.T.Reed, K.Debnath, L.O'FaolainGroup IV functionalization of low index waveguides
    Photonics North Montréal 28-30 May 2014    [ePrint: 367991]
  • 6592 —  F.Y.Gardes, C.G.Littlejohns, J.Soler Penadés, C.J.Mitchell, A.Z.Khokhar, G.T.Reed, G.Z.MashanovichGermanium for photonic applications
    ISTDM 2014: 7th International Silicon-Germanium Technology and Device Meeting Singapore 2-4 Jun 2014
    [Abstract]
       [ePrint: 367988]
  • 6567 —  M.Nedeljković, S.Stanković, C.J.Mitchell, A.Z.Khokhar, S.A.Reynolds, D.J.Thomson, F.Y.Gardes, C.G.Littlejohns, G.T.Reed, G.Z.MashanovichMid-infrared thermo-optic modulators in SoI
    IEEE Photonics Technology Letters 2014 Vol.26(13) pp.1352-1355
    [Abstract]
       [ePrint: 367560]
  • 6544 —  G.T.Reed, G.Z.Mashanovich, F.Y.Gardes, D.J.Thomson, Y.Hu, J.Soler Penadés, M.Nedeljković, A.Z.Khokhar, P.Thomas, C.G.Littlejohns, A.Ahmad, S.A.Reynolds, R.Topley, C.Mitchell, S.Stanković, N.Owens, X.Chen, P.R.Wilson, L.Ke, T.M.Ben Masaud, A.Tarazona, H.M.H.ChongRecent results in Silicon Photonics at the University of Southampton
    Photonics West 2014 San Francisco, USA 1-6 Feb 2014
    [Abstract]
       [ePrint: 367780]
  • 6541 —  G.T.Reed, G.Z.Mashanovich, F.Y.Gardes, D.J.Thomson, Y.Hu, J.Soler Penadés, M.Nedeljković, A.Z.Khokhar, P.Thomas, C.G.Littlejohns, A.Ahmed, S.A.Reynolds, R.Topley, C.Mitchell, S.Stanković, P.R.Wilson, L.Ke, T.M.Ben Masaud, A.Tarazona, H.M.H.ChongSilicon photonic devices for the near - and mid-infrared wavelength ranges
    Mediterranean Photonics Conference Trani, Italy 7-9 May 2014 (Invited)    [ePrint: 384227]

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