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Papers by Barry Luther-davies

Conference on Lasers and Electro-Optics 2012, 2012

Silicon has attracted great interest as a platform for both linear and nonlinear integrated photo... more Silicon has attracted great interest as a platform for both linear and nonlinear integrated photonics for over 15 years. While its primary applications have been in the telecom window (near 1.5 μm), the capability of exploiting its full transparency window to 8 μm in the mid-IR is highly attractive, since this will open it up to entirely new applications in fields such as spectroscopy, chemical and biological sensing, and free-space communications. However, while silicon-on-insulator has shown great promise just beyond the telecommunications window [to the shortwave IR band (2.5 μm)], its wavelength range has been limited to < 4 μm by absorption in the silica cladding layer. Here, we demonstrate octave-spanning supercontinuum generation in silicon, covering a continuous spectral range from 1.9 to beyond 6 μm in dispersion-engineered silicon-on-sapphire (SOS) nanowires. This represents both the widest spectrum and longest wavelength generated to date in any silicon platform, and establishes SOS as a promising new platform for integrated nonlinear photonics in the mid-IR.

Chalcogenide glasses, which contain S, Se or Te atoms combined with network forming elements such... more Chalcogenide glasses, which contain S, Se or Te atoms combined with network forming elements such as Ge, As, Sb have the largest third order optical nonlinearity of any inorganic glass. As a result they are attractive candidates for fibre and waveguide devices for all-optical signal processing in the telecommunications bands. In this talk I will review our recent progress in alloptical devices such as regenerators, wavelength converters and other devices in chalcogenide glasses.

We recently fabricated chalcogenide photonic crystal slabs (PCSs) using focused ion beam milling.... more We recently fabricated chalcogenide photonic crystal slabs (PCSs) using focused ion beam milling. We demonstrated over 98% coupling efficiency to a two-dimensional photonic crystal waveguide in a chalcogenide membrane using evanescent coupling via a tapered optical fibre nanowire. The presentation will discuss the design, fabrication and characterization of chalcogenide-based PCSs and preliminary work on cavities

ABSTRACT We achieve efficient coupling to both photonic crystal waveguides and nanocavities in ch... more ABSTRACT We achieve efficient coupling to both photonic crystal waveguides and nanocavities in chalcogenide glass via lowloss, highly flexible silica fibre nanowires.

ACOFT/AOS 2006 - 31st Australian Conference on Optical Fibre Technology and Meeting of the Australian Optical Society, Jun 1, 2007

We present experimental results on post-tuning the dispersion of a two-dimensional photonic cryst... more We present experimental results on post-tuning the dispersion of a two-dimensional photonic crystal waveguide made from Ge 33 As 12 Se 55 chalcogenide glass by exploiting the material photosensitivity to nearbandgap light. The change in the refractive index and volume of the material in response to exposure to 633nm light resulted in a shift of more than 5nm in the resonant coupling wavelength between a tapered optical fiber and the modes of a W1 waveguide. This represents a first proof of principle demonstration of the photosensitive post-tuning of a planar photonic crystal device.

Piers Online, 2007

We demonstrate that high-Q nanocavity mode in 2D photonic crystal made in highly nonlinear chalco... more We demonstrate that high-Q nanocavity mode in 2D photonic crystal made in highly nonlinear chalcogenide glass can be excited using evanescent coupling from a tapered optical fibre. This scheme provides a promising platform to realize low power integrated alloptical switching and logic functions.

... Soc. Am. B 22, 591-597 (2005) [2] C. Grillet, C. Smith, D. Freeman, S. Madden, B. Luther-Davi... more ... Soc. Am. B 22, 591-597 (2005) [2] C. Grillet, C. Smith, D. Freeman, S. Madden, B. Luther-Davies EC Mägi, DJ Moss, BJ Eggleton, “Efficient coupling to chalcogenide glass photonic crystal waveguides via silica optical fiber nanowires,” Opt.Express 14, 1070-1078 (2006). ...

Abstract Copyright© 2007 The Electromagnetics Academy. All rights reserved.. Cameron Smith, Chris... more Abstract Copyright© 2007 The Electromagnetics Academy. All rights reserved.. Cameron Smith, Christian Grillet, Eric C. Magi, Yinlan Ruan, Darren Freeman, Barry Luther-Davies, Steve Madden, Andrei Rode, Snjezana Tomljenovic-Hanic, DJ Moss, and Benjamin J. ...

A review of the development and applications of compact highly nonlinear Chalcogenide waveguides ... more A review of the development and applications of compact highly nonlinear Chalcogenide waveguides for ultra-fast all-optical signal processing is presented. We demonstrate the extreme tapering of a highly nonlinear As2S3 fiber to further increase its nonlinearity by more than an order of magnitude thereby enabling time-division demultiplexing of a 160 Gb/s signal by four-wave mixing (FWM) with significantly lower optical

We demonstrate highly efficient evanescent coupling between a highly nonlinear chalcogenide glass... more We demonstrate highly efficient evanescent coupling between a highly nonlinear chalcogenide glass two dimensional photonic crystal waveguide and a silica fiber nanowire. We achieve 98% insertion efficiency to the fundamental photonic crystal waveguide mode with a 3dB coupling bandwidth of 12nm, in good agreement with theory. This scheme provides a promising platform to realize low power nanocavity based all-optical switching and logic functions.

Ultrafast Phenomena XIII, 2003

ABSTRACT We report a self-frequency doubled Yb:YAl3(BO3)(4) laser mode-locked by anion implanted ... more ABSTRACT We report a self-frequency doubled Yb:YAl3(BO3)(4) laser mode-locked by anion implanted SESAM. Smooth tuning from the sub-picosecond to picosecond pulsewidth regime was achieved by varying the crystal angle with a maximum average green power of 270 mW.

Clinical Nutrition Supplements

ABSTRACT

Focus on Catalysts

ABSTRACT

LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting Conference Proceedings, 2007

ABSTRACT

2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007

Experimental and theoretical studies of probe beam reflectivity oscillations from single-crystal ... more Experimental and theoretical studies of probe beam reflectivity oscillations from single-crystal bismuth excited by fs-laser pulses are presented. Pump-probe technique with accuracy of 10-5 and time-resolution of 35 fs is used to measure the reflectivity. Results show that reflectivity oscillations are related to the atomic vibrations predominantly via electron-phonon coupling.

2007 Quantum Electronics and Laser Science Conference, 2007

We show that the reflectivity of laser-excited solid relates to phonons, driven by thermal forces... more We show that the reflectivity of laser-excited solid relates to phonons, driven by thermal forces, through the electron-phonon coupling rate. Controlled excitation of phonons is available by the optimum combination of laser and material parameters.

Frontiers in Optics 2012/Laser Science XXVIII, 2012

ABSTRACT Correlated photon pairs are generated via spontaneous-four-wave-mixing in a 10 mm As2S3 ... more ABSTRACT Correlated photon pairs are generated via spontaneous-four-wave-mixing in a 10 mm As2S3 waveguide. With photon channels detuned to the low spontaneous Raman window at 7.4 THz, a room temperature coincidence-to-accidental ratio of 7.6 was measured

Conference on Lasers and Electro-Optics 2012, 2012

Silicon has attracted great interest as a platform for both linear and nonlinear integrated photo... more Silicon has attracted great interest as a platform for both linear and nonlinear integrated photonics for over 15 years. While its primary applications have been in the telecom window (near 1.5 μm), the capability of exploiting its full transparency window to 8 μm in the mid-IR is highly attractive, since this will open it up to entirely new applications in fields such as spectroscopy, chemical and biological sensing, and free-space communications. However, while silicon-on-insulator has shown great promise just beyond the telecommunications window [to the shortwave IR band (2.5 μm)], its wavelength range has been limited to < 4 μm by absorption in the silica cladding layer. Here, we demonstrate octave-spanning supercontinuum generation in silicon, covering a continuous spectral range from 1.9 to beyond 6 μm in dispersion-engineered silicon-on-sapphire (SOS) nanowires. This represents both the widest spectrum and longest wavelength generated to date in any silicon platform, and establishes SOS as a promising new platform for integrated nonlinear photonics in the mid-IR.

Chalcogenide glasses, which contain S, Se or Te atoms combined with network forming elements such... more Chalcogenide glasses, which contain S, Se or Te atoms combined with network forming elements such as Ge, As, Sb have the largest third order optical nonlinearity of any inorganic glass. As a result they are attractive candidates for fibre and waveguide devices for all-optical signal processing in the telecommunications bands. In this talk I will review our recent progress in alloptical devices such as regenerators, wavelength converters and other devices in chalcogenide glasses.

We recently fabricated chalcogenide photonic crystal slabs (PCSs) using focused ion beam milling.... more We recently fabricated chalcogenide photonic crystal slabs (PCSs) using focused ion beam milling. We demonstrated over 98% coupling efficiency to a two-dimensional photonic crystal waveguide in a chalcogenide membrane using evanescent coupling via a tapered optical fibre nanowire. The presentation will discuss the design, fabrication and characterization of chalcogenide-based PCSs and preliminary work on cavities

ABSTRACT We achieve efficient coupling to both photonic crystal waveguides and nanocavities in ch... more ABSTRACT We achieve efficient coupling to both photonic crystal waveguides and nanocavities in chalcogenide glass via lowloss, highly flexible silica fibre nanowires.

ACOFT/AOS 2006 - 31st Australian Conference on Optical Fibre Technology and Meeting of the Australian Optical Society, Jun 1, 2007

We present experimental results on post-tuning the dispersion of a two-dimensional photonic cryst... more We present experimental results on post-tuning the dispersion of a two-dimensional photonic crystal waveguide made from Ge 33 As 12 Se 55 chalcogenide glass by exploiting the material photosensitivity to nearbandgap light. The change in the refractive index and volume of the material in response to exposure to 633nm light resulted in a shift of more than 5nm in the resonant coupling wavelength between a tapered optical fiber and the modes of a W1 waveguide. This represents a first proof of principle demonstration of the photosensitive post-tuning of a planar photonic crystal device.

Piers Online, 2007

We demonstrate that high-Q nanocavity mode in 2D photonic crystal made in highly nonlinear chalco... more We demonstrate that high-Q nanocavity mode in 2D photonic crystal made in highly nonlinear chalcogenide glass can be excited using evanescent coupling from a tapered optical fibre. This scheme provides a promising platform to realize low power integrated alloptical switching and logic functions.

... Soc. Am. B 22, 591-597 (2005) [2] C. Grillet, C. Smith, D. Freeman, S. Madden, B. Luther-Davi... more ... Soc. Am. B 22, 591-597 (2005) [2] C. Grillet, C. Smith, D. Freeman, S. Madden, B. Luther-Davies EC Mägi, DJ Moss, BJ Eggleton, “Efficient coupling to chalcogenide glass photonic crystal waveguides via silica optical fiber nanowires,” Opt.Express 14, 1070-1078 (2006). ...

Abstract Copyright© 2007 The Electromagnetics Academy. All rights reserved.. Cameron Smith, Chris... more Abstract Copyright© 2007 The Electromagnetics Academy. All rights reserved.. Cameron Smith, Christian Grillet, Eric C. Magi, Yinlan Ruan, Darren Freeman, Barry Luther-Davies, Steve Madden, Andrei Rode, Snjezana Tomljenovic-Hanic, DJ Moss, and Benjamin J. ...

A review of the development and applications of compact highly nonlinear Chalcogenide waveguides ... more A review of the development and applications of compact highly nonlinear Chalcogenide waveguides for ultra-fast all-optical signal processing is presented. We demonstrate the extreme tapering of a highly nonlinear As2S3 fiber to further increase its nonlinearity by more than an order of magnitude thereby enabling time-division demultiplexing of a 160 Gb/s signal by four-wave mixing (FWM) with significantly lower optical

We demonstrate highly efficient evanescent coupling between a highly nonlinear chalcogenide glass... more We demonstrate highly efficient evanescent coupling between a highly nonlinear chalcogenide glass two dimensional photonic crystal waveguide and a silica fiber nanowire. We achieve 98% insertion efficiency to the fundamental photonic crystal waveguide mode with a 3dB coupling bandwidth of 12nm, in good agreement with theory. This scheme provides a promising platform to realize low power nanocavity based all-optical switching and logic functions.

Ultrafast Phenomena XIII, 2003

ABSTRACT We report a self-frequency doubled Yb:YAl3(BO3)(4) laser mode-locked by anion implanted ... more ABSTRACT We report a self-frequency doubled Yb:YAl3(BO3)(4) laser mode-locked by anion implanted SESAM. Smooth tuning from the sub-picosecond to picosecond pulsewidth regime was achieved by varying the crystal angle with a maximum average green power of 270 mW.

Clinical Nutrition Supplements

ABSTRACT

Focus on Catalysts

ABSTRACT

LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting Conference Proceedings, 2007

ABSTRACT

2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007

Experimental and theoretical studies of probe beam reflectivity oscillations from single-crystal ... more Experimental and theoretical studies of probe beam reflectivity oscillations from single-crystal bismuth excited by fs-laser pulses are presented. Pump-probe technique with accuracy of 10-5 and time-resolution of 35 fs is used to measure the reflectivity. Results show that reflectivity oscillations are related to the atomic vibrations predominantly via electron-phonon coupling.

2007 Quantum Electronics and Laser Science Conference, 2007

We show that the reflectivity of laser-excited solid relates to phonons, driven by thermal forces... more We show that the reflectivity of laser-excited solid relates to phonons, driven by thermal forces, through the electron-phonon coupling rate. Controlled excitation of phonons is available by the optimum combination of laser and material parameters.

Frontiers in Optics 2012/Laser Science XXVIII, 2012

ABSTRACT Correlated photon pairs are generated via spontaneous-four-wave-mixing in a 10 mm As2S3 ... more ABSTRACT Correlated photon pairs are generated via spontaneous-four-wave-mixing in a 10 mm As2S3 waveguide. With photon channels detuned to the low spontaneous Raman window at 7.4 THz, a room temperature coincidence-to-accidental ratio of 7.6 was measured