Dr. Rex H. S. Bannerman Profile

Dr. Rex H. S. Bannerman

at Univ of Southampton

SPIE Involvement:

Author

Publications (10)

Proceedings Article | 13 March 2024 Presentation

Demonstration of holographically fabricated large grating couplers for integrated circular beam delivery

Salman Ahmed, James Field, Dong-Woo Ko, Peter Horak, Christopher Holmes, Peter Smith, Paul Gow, Corin Gawith, James Gates, Rex H. Bannerman

Proceedings Volume PC12889, PC128890J (2024) https://doi.org/10.1117/12.3001912

KEYWORDS: Beam delivery, Holography, Blazed gratings, Optical gratings, Ultraviolet radiation, Free space, Fabrication, Pulsed laser operation, Prisms, Optical alignment

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Proceedings Article | 13 March 2024 Presentation

Direct UV written Bragg gratings in lithium niobate ridge waveguides for analysis of process uniformity

Rex H. Bannerman, James Field, Q. Salman Ahmed, Paul Gow, James Gates, Peter G. Smith, Corin B. Gawith

Proceedings Volume PC12869, PC128690B (2024) https://doi.org/10.1117/12.3001044

KEYWORDS: Waveguides, Bragg gratings, Lithium niobate, Ultraviolet radiation, Analytical research, Second harmonic generation, Refractive index, Optical gratings, Zinc, Wave propagation

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Proceedings Article | 30 May 2022 Presentation

Functionalised optical fiber devices for nonlinear photonics: from high harmonics generation to frequency comb

Francesco De Lucia, Nico Englebert, Francois Leo, Pier Sazio, Adam Lewis, Rex Bannerman, James Gates, Gilberto Brambilla

Proceedings Volume PC12142, PC121420D (2022) https://doi.org/10.1117/12.2620972

KEYWORDS: Optical fibers, Frequency combs, Photonics, Nonlinear optics, High harmonic generation, Thermal effects, Nonlinear crystals, Materials processing, Laser damage threshold, Glasses

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SPIE Journal Paper | 11 April 2022 Open Access

Quantum entanglement demonstrator for public engagement

Paul Gow, James Gates, Rex H. Bannerman, Joshua Nunn, Paolo Mennea, Peter G. R. Smith

OE, Vol. 61, Issue 08, 081802, (April 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.8.081802

KEYWORDS: Ions, Photons, Photonics, Switches, Optical engineering, Software development, Quantum information, Quantum computing, Semiconductor lasers, Fiber optics

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Proceedings Article | 25 February 2020 Paper

Optimizing resolution in an integrated blazed chirped Bragg grating spectrometer

James Field, Sam Berry, Rex H. Bannerman, Corin B. Gawith, Peter G. Smith, James Gates

Proceedings Volume 11283, 112831G (2020) https://doi.org/10.1117/12.2546195

KEYWORDS: Bragg gratings, Spectroscopy, Waveguides, Diffraction gratings, Sensors, Cameras, Ultraviolet radiation, Spectral resolution, Spectrometers

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Proceedings Article | 18 February 2020 Paper

Enhancing the nonlinear functionality of step-index silica fibers through the combination of thermal poling and 2D materials

F. De Lucia, A. Lewis, R. H. Bannerman, N. Englebert, M. M. Nunez Velazquez, C.-C. Huang, J. Gates, S.-P. Gorza, J. Sahu, F. Leo, D. Hewak, P. J. Sazio

Proceedings Volume 11282, 1128212 (2020) https://doi.org/10.1117/12.2544140

KEYWORDS: Optical fibers, Cladding, Silica, Glasses, Molybdenum, Electrodes, Thermal effects, Nonlinear optics, Raman spectroscopy, Transition metals

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Thermal poling, a technique to create permanently effective second-order susceptibility in silica optical fibers, has recently been improved by the discovery of an “induction poling” technique¹ and the adoption of liquid electrodes², allowing for poling fibers of any length and geometry. Nevertheless, the nonlinearity created via thermal poling is always limited by the 𝜒⁽³⁾of the optical fiber material and by the maximum electric field that can be frozen inside the glass. For these reasons research is ongoing to determine routes for further improving the nonlinear effects due to the thermal poling process. In this work, we propose to enhance the effects of the thermal poling by exploiting the intrinsic nonlinear properties of some 2D materials³, which are deposited inside the cladding holes of a twin-hole silica fiber. The materials we focused on are 2D Transition Metal Chalcogenide (2D TMDC) MoS₂ and WS₂ and the technique adopted to realize the deposition inside the cladding channels of a twin-hole step index silica fiber consists of a thermal decomposition process4 of the precursor ammonium tetrathiomolybdate (NH4)2MoS⁴ in 6% H₂/Ar flow. The technique has allowed us to uniformly coat the two cladding channels for a length of ≈25 cm with a film nominally consisting in a bi-layer of the 2D materials. A Raman based analysis has been used to test the morphology of the coating. The fiber deposited with 2D materials was later thermally poled and periodically erased via exposure to UV light to reach the QPM condition at a wavelength of ≈1550 nm. The effective 𝜒⁽²⁾ of the fiber was measured via SHG for both the deposited and the pristine fiber, showing an enhancement of the nonlinearity in favor of the deposited one. The phenomenon can be explained by the exploitation of a higher 𝜒⁽³⁾ seen by the pump wave due to the presence of the 2D layer deposited inside the cladding holes and opens the possibility of exploiting the higher intrinsic material 𝜒⁽²⁾, in case of a periodic patterning/synthesis of the TMDC.

Proceedings Article | 4 March 2019 Presentation

Modular linear optical circuits for quantum information processing (Conference Presentation)

James Gates, Paolo Mennea, William Clements, Devin Smith, Rex H. Bannerman, Jelmer Renema, William Kolthammer, Ian Walmsley, Peter G. Smith

Proceedings Volume 10933, 109330A (2019) https://doi.org/10.1117/12.2510301

KEYWORDS: Quantum information processing, Optical circuits, Integrated optics, Phase shifts, Waveguides, Ultraviolet radiation, Photonics, Silica, Interferometers, Thermal optics

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For over a decade the field of quantum photonics has increasingly looked towards optical integrated platforms to perform more complex and sophisticated experiments. Silica integrated optics is an ideal material for this area, offering low propagation and fibre-coupling losses. To date many of the key on-chip experiments have been carried out in this platform, using bespoke monolithic devices. In this work we propose an alternative approach, implementing a linear network constructed from a number of identical reconfigurable modules. The modules are measured separately to produce an accurate model of the overall network. The cellular nature also allows the replacement of modules that are faulty or substandard. Each module comprises of an array of 10 Mach-Zhender interferometers. Forty thermo-optic phase shifters on each chip allows the control of both the amplitude and phase of the optical field within the devices. By cascading the modules any arbitrary NxN unitary network can be realised. The optical waveguides within the modules are fabricated by direct UV writing, where a scanning focused UV laser beam increases the local refractive index within a photosensitive germanosilicate glass layer. The resulting channel waveguides are engineered to have dimensions that are mode matched to standard optical fibre producing excellent coupling efficiency. Bragg gratings can also be simultaneously produced within the waveguides which greatly assists in the precise characterisation of the phase shifters, coupling ratios and optical losses within the modules. We will present our recent work in this area, demonstrating devices operating at telecom wavelengths for quantum information processing. We present a modular reconfigurable system for on-chip quantum optics experiments with excellent fibre compatibility and low propagation losses, implemented using direct-UV-written silica-on-silicon. The performance of fabricated devices in various configurations is reported.

Proceedings Article | 14 September 2018 Open Access

Taking large optical quantum states out of the lab: engaging pupils and the public on quantum photonics sciences

Matthew Posner, Paolo Mennea, Paul Gow, Rex H. Bannerman, Sam Berry, Devin Smith, James Gates, Peter G. Smith

Proceedings Volume 10741, 107410D (2018) https://doi.org/10.1117/12.2319391

KEYWORDS: Outreach programs, Optics education, Engineering education, Photonics, Semiconducting wafers, Optical engineering, Quantum optics, Optical lithography, Quantum information, Photonic integrated circuits

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Proceedings Article | 14 September 2018 Open Access

Taking quantum entanglement out of the lab

Paul Gow, James Gates, Rex H. Bannerman, Joshua Nunn, Matthew Posner, Paolo Mennea, Peter G. Smith

Proceedings Volume 10741, 107410M (2018) https://doi.org/10.1117/12.2321079

KEYWORDS: Photons, Photonics, Quantum information, Software development, Quantum computing, Optical engineering, Single photon

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Proceedings Article | 14 March 2018 Presentation

Direct UV-written integrated waveguides using 213nm light (Conference Presentation)

Paul Gow, Rex H. Bannerman, James Gates, Christopher Holmes, Peter G. Smith

Proceedings Volume 10535, 105350M (2018) https://doi.org/10.1117/12.2289592

KEYWORDS: Ultraviolet radiation, Waveguides, Fiber Bragg gratings, Silica, Planar waveguides, Deep ultraviolet, Hydrogen, Refractive index, Semiconducting wafers, Integrated photonics

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