Dr. William R. Headley Profile

Dr. William R. Headley

at Univ of Surrey

SPIE Involvement:

Author

Publications (23)

Proceedings Article | 17 January 2011 Paper

Mid-infrared silicon photonic devices

Goran Mashanovich, Milan Milosevic, Milos Nedeljkovic, Nathan Owens, William Headley, Ee Jin Teo, Boqian Xiong, Pengyuan Yang, Youfang Hu

Proceedings Volume 7943, 79430Q (2011) https://doi.org/10.1117/12.876060

KEYWORDS: Silicon, Waveguides, Mid-IR, Silicon photonics, Wave propagation, Oxides, Photoresist materials, Ions, Absorption, Etching

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Proceedings Article | 20 May 2009 Paper

Silicon photonics at the University of Surrey

G. Reed, G. Mashanovich, F. Gardes, R. Gwilliam, N. Wright, D. Thomson, B. Timotijevic, K. Litvinenko, W. Headley, A. Smith, A. Knights, P. Jessop, N. Tarr, J.H. Deane

Proceedings Volume 7366, 736602 (2009) https://doi.org/10.1117/12.823291

KEYWORDS: Waveguides, Silicon, Modulators, Silicon photonics, Polarization, Modulation, Resonators, Doping, Optical filters, Birefringence

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Proceedings Article | 18 February 2009 Paper

Fabrication and tailoring of silicon photonic devices via focused ion beam

S. Howe, W. Headley, D. Cox, G. Mashanovich, D. Thomson, G. Reed

Proceedings Volume 7220, 722011 (2009) https://doi.org/10.1117/12.811008

KEYWORDS: Waveguides, Gallium, Silicon photonics, Etching, Ion beams, Oxides, Atomic force microscopy, Prototyping, Silicon, Optical testing

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Proceedings Article | 18 February 2009 Paper

Free carrier lifetime modification in silicon

N. Wright, D. Thomson, K. Litvinenko, W. Headley, A. Smith, A. Knights, J. H. B. Deane, F. Gardes, G. Mashanovich, R. Gwilliam, G. Reed

Proceedings Volume 7220, 722006 (2009) https://doi.org/10.1117/12.810907

KEYWORDS: Waveguides, Silicon, Raman spectroscopy, Ions, Ion implantation, Absorption, Wave propagation, Optical amplifiers, Optical testing, Raman scattering

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Proceedings Article | 13 February 2008 Paper

An all-silicon channel waveguide fabricated using direct proton beam writing

E. Teo, A. Bettiol, M. B. Breese, P. Yang, G. Mashanovich, W. Headley, G. Reed, D. Blackwood

Proceedings Volume 6898, 68980Q (2008) https://doi.org/10.1117/12.762771

KEYWORDS: Waveguides, Silicon, Annealing, Channel waveguides, Refractive index, Light scattering, Etching, Cladding, Electrochemical etching, Silicon photonics

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Proceedings Article | 12 June 2007 Paper

Future prospects for silicon photonics

William Headley, Graham Reed, Goran Mashanovich, Branislav Timotijevic, Frederic Gardes, David Thomson, Pengyuan Yang, Ee-Jin Teo, Daniel Blackwood, Mark Breese, Andrew Bettiol, Peter Waugh

Proceedings Volume 6593, 65931I (2007) https://doi.org/10.1117/12.736867

KEYWORDS: Waveguides, Silicon, Modulators, Resonators, Silicon photonics, Polarization, Switches, Refractive index, Ions, Oxides

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Proceedings Article | 9 February 2007 Paper

Novel fabrication techniques for silicon photonics

G. Reed, P. Yang, W. Headley, P. Waugh, G. Mashanovich, D. Thomson, R. Gwilliam, E. Teo, D. Blackwood, M.B. Breese, A. Bettiol

Proceedings Volume 6477, 64770E (2007) https://doi.org/10.1117/12.705180

KEYWORDS: Waveguides, Silicon, Fabrication, Silicon photonics, Ion implantation, Refractive index, Oxygen, Etching, Fiber Bragg gratings, Wave propagation

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Proceedings Article | 6 February 2007 Paper

Waveguides and devices in silicon photonics: polarization independence

G. Reed, B. Timotijevic, F. Gardes, G. Mashanovich, W. Headley, N. Emerson

Proceedings Volume 6476, 647602 (2007) https://doi.org/10.1117/12.713956

KEYWORDS: Waveguides, Polarization, Resonators, Silicon, Modulators, Silicon photonics, Phase shifts, Refractive index, Wave propagation, Birefringence

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Proceedings Article | 20 April 2006 Paper

Characteristics of rib waveguide racetrack resonators in SOI

G. Reed, W. Headley, F. Gardes, B. Timotijevic, S. Chan, G. Mashanovich

Proceedings Volume 6183, 61830G (2006) https://doi.org/10.1117/12.666758

KEYWORDS: Resonators, Waveguides, Polarization, Modulation, Modulators, Silicon, Phase shifts, Signal detection, Directional couplers, Wave propagation

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Optical ring/racetrack resonators have the sufficient flexibility to realise many functions in a single device, from filters/multiplexers, to modulators, to switches. The use of Silicon-On-Insulator (SOI) material, coupled with Ultra Large Scale Integration (ULSI) processing techniques, may allow the cost of these devices to become economically advantageous over current components. This paper describes our recent work in developing polarisation independent ring resonators, and subsequent, work on increasing the limited free spectral range and full width half maximum of the resonance. There are two key components that comprise a polarisation-independent racetrack resonator: a polarisation-independent rib waveguide and a polarisation-independent directional coupler. Polarisation independence is achieved in the waveguides when the geometrical design ensures that both polarisation modes propagate with the same effective index. We report on such devices together with polarisation independent couplers, which are achieved by allowing different inter multiples of the coupling length for the TE and the TM modes. By combining these components, the resulting device is a polarisation independent ring resonators. These devices have been thermally modulated by means of a modulated visible laser and alternatively via small heaters fabricated on the waveguides. We have also modelled ring resonator modulators via carrier injection and depletion. Subsequently we have improved the device characteristics by employing smaller bend radii to increase the free spectral range by a factor of 5, and by cascading racetracks to improve the full width half maxima of the resonance by almost 40%. Experimental results are reported for most of the above characteristics. We will further investigate the opportunities for increasing the FSR whilst retaining polarisation independence, the possibility of retaining polarisation independence whilst utilising the properties of the ring resonator to form improved modulators.

Proceedings Article | 1 March 2006 Paper

Experimental evidence of modal properties using directional couplers in silicon-on-insulator

Graham Reed, William Headley, Seong Chan, Goran Masanovic, Simon Howe, David Thomson

Proceedings Volume 6125, 61250N (2006) https://doi.org/10.1117/12.652210

KEYWORDS: Waveguides, Modeling, Directional couplers, Polarization, Oxides, Silicon, Data modeling, Etching, Birefringence, Single mode fibers

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Proceedings Article | 7 March 2005 Paper

Silicon photonics: the early years

Graham Reed, William Headley, C. E. Png

Proceedings Volume 5730, (2005) https://doi.org/10.1117/12.596921

KEYWORDS: Silicon, Waveguides, Modulators, Modulation, Silicon photonics, Sensors, Refractive index, Switches, Switching, Germanium

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Proceedings Article | 7 March 2005 Paper

Preliminary experimental results of a dual grating-assisted directional coupler on SOI

Goran Masanovic, Graham Reed, Vittorio Passaro, William Headley, Branislav Timotijevic, Raghied Atta, Mike Josey, Graham Ensell, Alan Evans

Proceedings Volume 5730, (2005) https://doi.org/10.1117/12.591460

KEYWORDS: Waveguides, Silicon, Directional couplers, Refractive index, Optical fibers, Fiber couplers, Light wave propagation, Etching, Objectives, Sensors

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Proceedings Article | 7 March 2005 Paper

Enhanced polarization-independent optical ring resonators on silicon-on-insulator

William Headley, Graham Reed, Frederic Gardes, Ansheng Liu, Mario Paniccia

Proceedings Volume 5730, (2005) https://doi.org/10.1117/12.590354

KEYWORDS: Waveguides, Polarization, Resonators, Modeling, Silicon, Directional couplers, Etching, Telecommunications, Silicon photonics, Switches

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Proceedings Article | 18 August 2004 Paper

A grating-based coupler for fiber-to-silicon waveguide excitation

Goran Masanovic, Graham Reed, Vittorio Passaro, William Headley, Mike Josey, Graham Ensell, Raghied Atta, Alan Evans

Proceedings Volume 5451, (2004) https://doi.org/10.1117/12.545920

KEYWORDS: Silicon, Waveguides, Refractive index, Etching, Semiconducting wafers, Fiber couplers, Optical fibers, Tolerancing, Plasma enhanced chemical vapor deposition, Integrated optics

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Proceedings Article | 18 August 2004 Paper

Polarization-independent optical ring resonators on silicon-on-insulator

William Headley, Graham Reed, Ansheng Liu, Mario Paniccia, Simon Howe

Proceedings Volume 5451, (2004) https://doi.org/10.1117/12.546536

KEYWORDS: Resonators, Polarization, Waveguides, Silicon, Dense wavelength division multiplexing, Directional couplers, Etching, Modeling, Oxides, Switches

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Proceedings Article | 1 July 2004 Paper

Small devices in SOI: fabrication and design issues

Graham Reed, Goran Masanovic, William Headley, Ching Eng Png, Seong Chan, Soon Lim, Vittorio Passaro, D. Hak, Oded Cohen, Mario Paniccia

Proceedings Volume 5357, (2004) https://doi.org/10.1117/12.527422

KEYWORDS: Waveguides, Silicon, Resonators, Etching, Modulators, Modulation, Birefringence, Polarization, Refractive index, Doping

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Proceedings Article | 1 July 2004 Paper

Fabrication of optical ring resonators in silicon on insulator

William Headley, Graham Reed, Ansheng Liu, Oded Cohen, D. Hak, Mario Paniccia, Simon Howe, Inga Huille

Proceedings Volume 5357, (2004) https://doi.org/10.1117/12.527420

KEYWORDS: Waveguides, Resonators, Polarization, Silicon, Modeling, Etching, Directional couplers, Data modeling, Dense wavelength division multiplexing, Telecommunications

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Proceedings Article | 14 June 2004 Paper

Design and experimental results of small silicon-based optical modulators

Ching Eng Png, Graham Reed, William Headley, Kevin Homewood, Ansheng Liu, Mario Paniccia, Ragheid Atta, Graham Ensell, Alan Evans, D. Hak, Oded Cohen

Proceedings Volume 5356, (2004) https://doi.org/10.1117/12.529385

KEYWORDS: Modulators, Resonators, Modulation, Waveguides, Silicon, Refractive index, Signal detection, Optical modulators, Plasma, Dispersion

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Proceedings Article | 8 December 2003 Paper

Characterization of integrated Bragg gratings on silicon-on-insulator rib waveguides

Seong Chan, Vittorio Passaro, Soon Lim, Ceng Png, William Headley, Goran Masanovic, Graham Reed, Ragheid Atta, Graham Ensell, Alan Evans

Proceedings Volume 5248, (2003) https://doi.org/10.1117/12.511138

KEYWORDS: Waveguides, Etching, Fiber Bragg gratings, Birefringence, Silicon, Reflectivity, Wave propagation, Refractive index, Polarization, Diffraction gratings

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Proceedings Article | 14 June 2002 Paper

Optical coherence imaging of rat tumor spheroids

Ping Yu, M. Mustata, William Headley, David Nolte, J. Turek, Paul French

Proceedings Volume 4619, (2002) https://doi.org/10.1117/12.470485

KEYWORDS: Tumors, Holograms, Coherence imaging, Optical coherence tomography, Four wave mixing, Video, Beam splitters, Biomedical optics, Holography, Cameras

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Proceedings Article | 14 June 2002 Paper

Low-coherence photorefractive holography for high-speed 3D imaging including through scattering media

Christopher Dunsby, Y. Gu, Zunaira Ansari, Duncan Parsons-Karavassilis, Jan Siegel, Masahide Itoh, S. Iwamoto, William Headley, Michael Melloch, David Nolte, Paul French

Proceedings Volume 4619, (2002) https://doi.org/10.1117/12.470469

KEYWORDS: Microscopes, Holography, Light scattering, Coherence (optics), Modulation, Stereoscopy, Scattering, CCD cameras, Charge-coupled devices, Mirrors

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Proceedings Article | 11 June 2002 Paper

Autocorrelation imaging of 3D structures using a femtosecond laser: application to imaging of sandstone

Ping Yu, M. Mustata, William Headley, L. Pyrak-Nolte, David Nolte, Paul French

Proceedings Volume 4643, (2002) https://doi.org/10.1117/12.470423

KEYWORDS: Holograms, Coherence imaging, Light scattering, Optical coherence tomography, Scanning electron microscopy, Translucency, Holography, Geometrical optics, Reflection, 3D image processing

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Proceedings Article | 24 October 2001 Paper

High-speed 3D imaging using photorefractive holography with novel low-coherence interferometers

Yan Gu, Zunaira Ansari, Jan Siegel, Christopher Dunsby, Masahide Itoh, Duncan Parsons-Karavassilis, Mary Tziraki, Richard Jones, Keith Dowling, Paul French, David Nolte, William Headley, Michael Melloch

Proceedings Volume 4434, (2001) https://doi.org/10.1117/12.446694

KEYWORDS: Holography, Light scattering, Modulation, Semiconductor lasers, Light emitting diodes, Imaging systems, Tissue optics, CCD cameras, Stereoscopy, Luminescence

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Showing 5 of 23 publications

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