Dr. Dominic F. G. Gallagher Profile

Dr. Dominic F. G. Gallagher

CEO at Photon Design

SPIE Involvement:

Author

Publications (10)

Proceedings Article | 5 October 2015 Presentation

A comparative study of second-harmonic generation in plasmonic and dielectric gratings made of centrosymmetric materials (Presentation Recording)

Martin Weismann, Dominic F. Gallagher, Nicolae-Coriolan Panoiu

Proceedings Volume 9547, 95470R (2015) https://doi.org/10.1117/12.2187553

KEYWORDS: Second-harmonic generation, Numerical analysis, Global system for mobile communications, Dielectric polarization, Nonlinear optics, Dielectrics, Plasmonics, Diffraction gratings, Materials processing, Diffraction

Read Abstract +

We present a new numerical method for the analysis of second-harmonic generation (SHG) in one- and two-dimensional (1D, 2D) diffraction gratings containing centrosymmetric quadratically nonlinear materials. Thus, the nonlinear optical properties of a material are determined by its symmetry properties: non-centrosymmetric materials lack inversion symmetry and therefore allow local even-order SHG in the bulk of the material, whereas this process is forbidden in centrosymmetric materials. The inversion symmetry of centrosymmetric materials is broken at their surface whence they allow local surface SHG. Additionally, centrosymmetric materials give rise to nonlocal (bulk) SHG. Our numerical method extends the linear generalized source method (GSM), which is an efficient numerical method for solving the problem of linear diffraction in periodic structures of arbitrary geometry. The nonlinear GSM is a three-step algorithm: for a given excitation at the fundamental frequency the linear field is computed using the linear GSM. This field gives rise to a nonlinear source polarization at the second harmonic (SH) frequency. This nonlinear polarization comprises surface and bulk polarizations as additional source terms and is subsequently used to compute the nonlinear near- and far-field optical response at the SH. We study the convergence characteristics of the nonlinear GSM for 1D and 2D periodic structures and emphasize the numerical intricacies caused by the surface SH polarization term specific to centrosymmetric materials. In order to illustrate the practical significance of our numerical method, we apply it to metallic gratings made of Au and Ag as well as dielectric grating structures made of silicon and investigate the relative contribution of the bulk and surface nonlinearity to the nonlinear optical response at the SH. Particular attention is paid to optical effects that have a competing influence to the nonlinear optical response of the grating structures, namely the resonant local field enhancement and optical losses.

Proceedings Article | 27 February 2015 Paper

Low-crosstalk fabrication-insensitive echelle grating multiplexers and passives for the silicon photonics toolbox

Corrado Sciancalepore, Richard Lycett, Jacques Dallery, Sebastien Pauliac, Karim Hassan, Julie Harduin, Hélène Duprez, Ulf Weidenmueller, Dominic F. Gallagher, Sylvie Menezo, Badhise Ben-Bakir

Proceedings Volume 9365, 936508 (2015) https://doi.org/10.1117/12.2075335

KEYWORDS: Waveguides, Diffraction gratings, Brain-machine interfaces, Optical design, Fiber couplers, Semiconducting wafers, Multiplexers, Silicon, Interferometers, Dispersion

Read Abstract +

Proceedings Article | 1 May 2014 Paper

Generalized source method for modeling nonlinear diffraction in planar periodic structures

Martin Weismann, Dominic F. Gallagher, Nicolae Panoiu

Proceedings Volume 9131, 913115 (2014) https://doi.org/10.1117/12.2052247

KEYWORDS: Diffraction gratings, Global system for mobile communications, Waveguides, Polarization, Second-harmonic generation, Nonlinear optics, Diffraction, Optical design, Waveguide modes, Gallium arsenide

Read Abstract +

Proceedings Article | 1 May 2008 Paper

Modelling of silicon and active photonic integrated circuits

Dominic Gallagher, Thomas Felici

Proceedings Volume 6996, 69961E (2008) https://doi.org/10.1117/12.787033

KEYWORDS: Device simulation, Photonic integrated circuits, Modeling, Waveguides, Finite impulse response filters, Optical filters, Silicon, Computer simulations, Silicon photonics, Wave propagation

Read Abstract +

Proceedings Article | 26 October 2007 Paper

Time-domain simulation of CMOS compatible micro-disk lasers

Wolfram Pernice, Frank Payne, Dominic Gallagher

Proceedings Volume 6796, 679636 (2007) https://doi.org/10.1117/12.779057

KEYWORDS: Optical simulations, Finite-difference time-domain method, Computer simulations, Disk lasers, Laser damage threshold, Silica, Differential equations, Erbium, Picosecond phenomena, Refractive index

Read Abstract +

Proceedings Article | 2 March 2007 Paper

Automatic design and optimisation of Si nanophotonics devices using finite element frequency domain solvers

T. Felici, D. F. G. Gallagher, Lorenzo Bolla

Proceedings Volume 6475, 64750L (2007) https://doi.org/10.1117/12.717509

KEYWORDS: Waveguides, Resonators, Chemical elements, Silicon, Neodymium, Nanophotonics, Waveguide modes, Silicon photonics, Photonic devices, Nanowires

Read Abstract +

Proceedings Article | 28 April 2005 Paper

Design and simulation of widely tunable lasers using a time domain travelling wave model

Dominic Gallagher

Proceedings Volume 5722, (2005) https://doi.org/10.1117/12.605535

KEYWORDS: Optical simulations, Tunable lasers, Physics, Optoelectronic devices

Read Abstract +

Proceedings Article | 25 July 2003 Paper

Improved waveguide structures derived from new rapid optimization techniques

Thomas Felici, Dominic Gallagher

Proceedings Volume 4986, (2003) https://doi.org/10.1117/12.483610

KEYWORDS: Waveguides, Photonic crystals, Crystals, Beam propagation method, Wave propagation, Optimization (mathematics), Chemical species, Feedback loops, Mirrors, Refractive index

Read Abstract +

Proceedings Article | 19 June 2003 Paper

Eigenmode expansion methods for simulation of optical propagation in photonics: pros and cons

Dominic Gallagher, Thomas Felici

Proceedings Volume 4987, (2003) https://doi.org/10.1117/12.473173

KEYWORDS: Waveguides, Finite-difference time-domain method, Radio propagation, Photonics, Beam propagation method, Wave propagation, Modeling, Computer simulations, Scattering, Photonic crystals

Read Abstract +

Proceedings Article | 3 September 1992 Paper

16-GHz GaAs/AlGaAs multiple-quantum-well laser with vertically compact waveguide structure

John Ralston, Ignacio Esquivias, S. Weisser, Dominic Gallagher, Paul Tasker, Eric Larkins, Josef Rosenzweig, Hans Zappe, Joachim Fleissner, Donat As

Proceedings Volume 1680, (1992) https://doi.org/10.1117/12.137711

KEYWORDS: Gallium arsenide, Cladding, Quantum wells, Waveguides, Modulation, Luminescence, Aluminum, Optoelectronics, High speed electronics, Binary data

Read Abstract +

Showing 5 of 10 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years