Prof. Callum G. Littlejohns Profile

Prof. Callum G. Littlejohns

Principal Enterprise Fellow at University of Southampton

SPIE Involvement:

Author | Editor

Area of Expertise:

silicon photonics

Websites:

Company Website

Publications (21)

Proceedings Article | 13 March 2024 Presentation

The next phase of all silicon electro-optical modulators

Weiwei Zhang, Martin Ebert, Ke Li, Bigeng Chen, Xingzhao Yan, Han Du, Mehdi Banakar, Dehn T. Tran, Callum Littlejohns, Graham Reed, David Thomson

Proceedings Volume PC12891, PC1289109 (2024) https://doi.org/10.1117/12.2691582

KEYWORDS: Silicon, Modulation, Electrooptic modulators, Electro optics, Transmitters, Molybdenum, Waveguides, Silicon photonics, Resonators, Power consumption

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Proceedings Article | 30 November 2023 Paper

Education and training of silicon photonics engineers and technicians

Goran Mashanovich, Callum Littlejohns, Thalia Dominguez Bucio, Milos Nedeljkovic

Proceedings Volume 12794, 127940J (2023) https://doi.org/10.1117/12.3008422

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Proceedings Article | 13 March 2023 Presentation + Paper

Ge-on-Si waveguide device for self-referenced fingerprint region absorption spectroscopy

M. Nedeljkovic, C. Stirling, D. Rowe, M. Banakar, Y. Qi, X. Yan, C. Littlejohns, G. Mashanovich

Proceedings Volume 12426, 124260I (2023) https://doi.org/10.1117/12.2650469

KEYWORDS: Waveguides, Absorption, Sensors, Waveguide sensors, Circuit switching, Waveguide modes, Single mode fibers, Relative intensity noise, Photodetectors, Mid-IR

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Proceedings Article | 11 January 2023 Presentation + Paper

Adaptive delay lines implemented on a photonics chip for extended-range, high-speed absolute distance measurement

C. Coggrave, P. Ruiz, J. Huntley, C. Nolan, A. Gribble, H. Du, M. Banakar, X. Yan, D. Tran, C. Littlejohns

Proceedings Volume 12334, 1233406 (2023) https://doi.org/10.1117/12.2647526

KEYWORDS: Optical switching, Photonic integrated circuits, Distance measurement, Interferometers, Calibration, Waveguides, Beam path, Tunable lasers, Switches, Silicon

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Proceedings Article | 30 June 2022 Open Access

Teaching silicon photonics using new technologies

Goran Mashanovich, Milan Milosevic, Callum Littlejohns, Mimi Lee, Sofia Bazzini, Sarah Fielding, Milos Nedeljkovic

Proceedings Volume 12297, 122970A (2022) https://doi.org/10.1117/12.2635511

KEYWORDS: Photonics, Silicon photonics, Waveguides, Modulators, Electro optical modeling, New and emerging technologies, Modulation, Sensors, Photonic integrated circuits, Interferometers

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Proceedings Article | 20 May 2022 Presentation + Paper

Single-shot wavelength meter on a photonic chip for absolute distance measurement using frequency scanning interferometry

C. Coggrave, P. Ruiz, C. Pallikarakis, J. Huntley, H. Du, M. Banakar, X. Yan, D. Tran, C. Littlejohns

Proceedings Volume 12137, 1213703 (2022) https://doi.org/10.1117/12.2626785

KEYWORDS: Waveguides, Solid state electronics, Interferometry, Manufacturing, Distance measurement, Calibration, Short wave infrared radiation, Silicon photonics, Refractive index, Wavelength tuning

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Proceedings Article | 5 March 2022 Presentation

MOSCAP and 3D taper

David Thomson, Weiwei Zhang, Martin Ebert, Ke Li, Jamie Reynolds, Bigeng Chen, Xingzhao Yan, Han Du, Mehdi Banakar, Ying Tran, Callum Littlejohns, Graham Reed

Proceedings Volume PC12006, PC1200602 (2022) https://doi.org/10.1117/12.2605906

KEYWORDS: Waveguides, Optical modulators, Silicon photonics, Silicon, Plasma, Oxides, Etching, Dispersion, Capacitance

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Proceedings Article | 6 December 2021 Paper

Silicon photonics open access foundry services review for emerging technology

Ramsey Selim, Romano Hoofman, Mulham Khoder, Adil Masood, Callum Littlejohns, Douwe Geuzebroek, Robert Grootjans, Thomas Drischel, Kholdoun Torki

Proceedings Volume 11880, 118800C (2021) https://doi.org/10.1117/12.2600958

KEYWORDS: Silicon, Silicon photonics, Mid-IR, Infrared sensors, Infrared imaging, Data communications, Waveguides, Metals, Biosensing, Visible radiation

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Proceedings Article | 6 October 2021 Presentation

Capacitive silicon optical modulators for high-speed and high-efficiency operation

David Thomson, Bigeng Chen, Weiwei Zhang, Martin Ebert, Xia Chen, Jamie Reynolds, Xingzhao Yan, Han Du, Mehdi Banakar, Ying Tran, Kapil Debnath, Callum Littlejohns, Shin Saito, Graham Reed

Proceedings Volume 11880, 118800J (2021) https://doi.org/10.1117/12.2603017

KEYWORDS: Silicon, Optical modulators, Waveguides, Silicon photonics, Phase shifts, Optics manufacturing, Modulators, Modulation, Manufacturing, Electronics

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Proceedings Article | 6 October 2021 Presentation

Electronic-photonic convergence for 100Gb/s silicon photonics transmitters

Ke Li, David Thomson, Weiwei Zhang, Shenghao Liu, XingZhao Yan, Callum Littlejohns, Mehdi Banakar, Han Du, Wei Cao, Fanfan Meng, Martin Ebert, Ying Tran, Periklis Petropoulos, Graham Reed

Proceedings Volume 11880, 118800D (2021) https://doi.org/10.1117/12.2603245

KEYWORDS: Transmitters, Silicon photonics, Photonics, Electronics, System integration, Silicon, Packaging, Optical modulators, Optical interconnects, Modulators

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Proceedings Article | 6 October 2020 Presentation

Welcome and Introduction to Conference 11577: Emerging Applications in Silicon Photonics

Callum Littlejohns

Proceedings Volume 11577, 115770B (2020) https://doi.org/10.1117/12.2585934

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Proceedings Article | 2 April 2020 Presentation

CORNERSTONE’s silicon photonics prototyping platform: present status and future outlook (Conference Presentation)

Callum Littlejohns, Ying Tran, Han Du, Mehdi Banakar, Xingzhao Yan, Marc Sorel, Frederic Gardes, Dave Thomson, Goran Mashanovich, Graham Reed

Proceedings Volume 11364, 113640T (2020) https://doi.org/10.1117/12.2559132

KEYWORDS: Silicon photonics, Prototyping, Deep ultraviolet, Projection lithography, Electron beam lithography, Silicon, Data communications, LIDAR, Mid-IR

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Proceedings Article | 4 March 2019 Presentation

Rapid device prototyping using the CORNERSTONE platform (Conference Presentation)

Callum Littlejohns, Ying Tran, Han Du, Stevan Stanković, Xingzhao Yan, Graham Sharp, Marc Sorel, Roger Webb, Jonathon England, Harold Chong, Frederic Gardes, David Thomson, Goran Mashanovich, Graham Reed

Proceedings Volume 10923, 1092303 (2019) https://doi.org/10.1117/12.2508850

KEYWORDS: Prototyping, Silicon photonics, Deep ultraviolet, Photonics, Optoelectronics, Metamaterials, Nanotechnology, Physical sciences, Physical research, Optical lithography

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Proceedings Article | 25 October 2018 Paper

56 Gbps Si/GeSi integrated EAM

L. Mastronardi, M. Banakar, A. Khokhar, N. Hattasan, T. Rutirawut, T. Domínguez Bucio, K. Grabska, C. Littlejohns, A. Bazin, G. Mashanovich, F. Gardes

Proceedings Volume 10823, 108230D (2018) https://doi.org/10.1117/12.2502709

KEYWORDS: Waveguides, Silicon, Modulators, Germanium, Absorption, Doping, Eye, Modulation, Optical amplifiers, Single mode fibers

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Proceedings Article | 23 February 2018 Paper

Group IV mid-infrared devices and circuits

G. Mashanovich, J. Soler Penadés, W. Cao, Z. Qu, A. Osman, Y. Wu, A. Khokhar, C. Littlejohns, S. Stankovic, S. Reynolds, V. Mittal, G. Murugan, J. Wilkinson, Y. Qi, F. Gardes, D. Thomson, M. Nedeljkovic

Proceedings Volume 10535, 1053512 (2018) https://doi.org/10.1117/12.2289531

KEYWORDS: Silicon, Waveguides, Germanium, Mid-IR, Modulators, Sensors, Absorption, Silicon photonics, Wave propagation, Light wave propagation

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Proceedings Article | 22 February 2018 Presentation + Paper

Advancing silicon photonics by germanium ion implantation into silicon

Graham Reed, Xia Chen, Milan Milosevic, Wei Cao, Callum Littlejohns, Ali Khokhar, Yohann Franz, Antoine F. Runge, Sakellaris Mailis, David Thomson, Anna Peacock

Proceedings Volume 10536, 105361T (2018) https://doi.org/10.1117/12.2292199

KEYWORDS: Waveguides, Silicon, Resonators, Annealing, Germanium, Silicon photonics, Ion implantation, Refractive index

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Proceedings Article | 22 February 2018 Paper

All silicon approach to modulation and detection at λ = 2 µm

Callum Littlejohns, Milos Nedeljkovic, Wei Cao, Jordi Soler Penades, David Hagan, Jason Ackert, Mohamed Saïd Rouifed, Wanjun Wang, Zecen Zhang, Haodong Qiu, Tina Guo Xin, Andrew Knights, Graham Reed, Goran Mashanovich, Hong Wang, David Thomson

Proceedings Volume 10538, 105380Y (2018) https://doi.org/10.1117/12.2288951

KEYWORDS: Silicon, Absorption, Modulation, Refractive index, Photodetectors, Modulators, Waveguides, Sensors, Phase shifts, Silicon photonics

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Proceedings Article | 20 February 2017 Presentation + Paper

Ion implantation in silicon to facilitate testing of photonic circuits

Graham Reed, Milan Milosevic, Xia Chen, Wei Cao, Callum Littlejohns, Hong Wang, Ali Khokhar, David Thomson

Proceedings Volume 10107, 1010709 (2017) https://doi.org/10.1117/12.2252770

KEYWORDS: Ion implantation, Silicon, Diffraction gratings, Semiconducting wafers, Wafer testing, Photonic integrated circuits, Refractive index, Silicon photonics, Packaging, Annealing, Resonators, Ions, Waveguides, Germanium

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Proceedings Article | 13 February 2016 Paper

Silicon and germanium mid-infrared photonics

G. Mashanovich, G. Reed, M. Nedeljkovic, J. Soler Penades, C. Mitchell, A. Khokhar, C. Littlejohns, S. Stankovic, X. Chen, L. Shen, N. Healy, A. Peacock, C. Alonso-Ramos, A. Ortega-Monux, G. Wanguemert-Perez, I. Molina-Fernandez, P. Cheben, J. Ackert, A. Knights, F. Gardes, D. Thomson

Proceedings Volume 9755, 97550W (2016) https://doi.org/10.1117/12.2212834

KEYWORDS: Silicon, Waveguides, Germanium, Modulation, Absorption, Cladding, Mid-IR, Transparency, Photonics, Sensors

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Proceedings Article | 27 February 2015 Paper

Group IV mid-infrared photonics

G. Mashanovich, M. Nedeljkovic, J. Soler Penades, C. Mitchell, A. Khokhar, C. Littlejohns, S. Stankovic, B. Troia, Y. Wang, S. Reynolds, V. M. Passaro, L. Shen, N. Healy, A. Peacock, C. Alonso-Ramos, A. Ortega-Monux, G. Wanguemert-Perez, I. Molina-Fernandez, D. Rowe, J. Wilkinson, P. Cheben, J. Ackert, A. Knights, D. Thomson, F. Gardes

Proceedings Volume 9367, 93670Q (2015) https://doi.org/10.1117/12.2176219

KEYWORDS: Waveguides, Silicon, Mid-IR, Germanium, Modulation, Photonics, Sensors, Resonators, Brain-machine interfaces, Photodetectors

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Proceedings Article | 8 March 2014 Paper

Recent results in silicon photonics at the University of Southampton

G. Reed, G. Mashanovich, F. Gardes, D. Thomson, Y. Hu, J. Soler-Penades, M. Nedeljkovic, A. Khokhar, P. Thomas, C. Littlejohns, A. Ahmad, S. Reynolds, R. Topley, C. Mitchell, S. Stankovic, N. Owens, X. Chen, P. Wilson, L. Ke, T. Ben Masaud, A. Tarazona, H. Chong

Proceedings Volume 8989, 89890D (2014) https://doi.org/10.1117/12.2045490

KEYWORDS: Waveguides, Modulators, Silicon photonics, Silicon, Photonics, Brain-machine interfaces, Multiplexers, Mid-IR, Etching, Ions

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