What can ultrasonic arrays tell us about cracks (or any defect)?, ESIA, 16th International Conference on Engineering Structural Integrity Assessment (Online) 6/10/2021.

Manipulation of matter with acoustic radiation force devices, Center for Soft Matter Research (CSMR) seminar, New York University, USA (Online), 22/9/2021.

Ultrasonic and acoustic sensing for buried pipe inspection with swarms of robots, RAIN Webinar series (Online), 22/4/2021.

Surfing on an ultrasonic wave – ultrasonic arrays as non-contact manipulators, 2nd Dugald Cameron Lecture (Online), Organised by the Centre for Medical and Industrial Ultrasonics, University of Glasgow, 16/3/2021.

25 years doing ultrasonics in Bristol, UNDT Group Seminar (Online), 3/3/2021.

Opportunities to engage with the FIND CDT, RCNDE Technology Transfer Event (Online), 25/1/2021.


A history of ultrasonic non-destructive testing – with a focus on array technology, UNDT Group Seminar (Online), 17/12/2020.

Taking Technology forwards, Pipebots Seminar Series (Online), 3/12/2020.

Acoustic levitation and volumetric displays, Blow Your Mind Week, Physics & Astronomy Society, University College Cork (Online), 28/10/2020.

NDE Doctoral Training – Engineers for the Future, Plenary talk at The Annual BINDT Conference, NDT2020 (Online), 14/8/2020.

Defect Characterisation using ultrasonic arrays – linear and nonlinear methods, UKAN Webinar (Online), 8/7/2020.

Biomedical applications of acoustic tweezers, UKAN Webinar, Biomedical Acoustics Special Interest Group (Online), 26/6/2020.

Ultrasonic manipulation and its application across the length scales, UKAN Webinar (Online), 12/5/2020.


Ultrasonic robotics – ​particle manipulation across the length scales, 3rd SFB Meeting on Tomography Across the Scales, Obergurgl University Centre, Innsbruck University, Austria, 3/12/2019​.

Invisible robotics – ultrasonic particle manipulation across the length scales, Physics Colloquium, University of Bristol, Bristol, 18/11/2019.

Parallels between optical tweezing and acoustic tweezing, Rank Prize Fund Meeting, Parallels between acoustics and EM radiation in structured materials, Grasmere, 29/10/2019.

The power of design simplicity – exploring new applications for bulk wave acoustic manipulation devices, Keynote at UK Fluids Network 9th Acoustofluidics SIG, Cardiff University, Cardiff, 16/10/2019.

Acoustic manipulation using in-plane devices – progress towards patterning and mechanophenotyping (Co-author: Glauber Silva), Acoustofluidics 2019, University of Twente, Enschede, Netherlands, 27/8/2019.

Defect Characterisation using ultrasonic arrays – fundamental limitations and future possibilities, Plenary Lecture at 46th Annual Review of Progress on Quantitative Non-Destructive Evaluation (QNDE), Portland OR, USA, 15/7/2019.

Holographic Acoustic Tweezers, UK Fluids Network and UK Acoustic Network’s Acoustofluidics Forum and Olympics 2019, Bristol, UK, 26/6/2019.

Detection and characterisation of defects in highly scattering materials using ultrasonic arrays (Co-authors: Long Bai and Alexander Velichko), Ambassadors Chair Closing Symposium – Advances in Ultrasound Based Imaging for Non-Destructive Testing and Medical Applications, KU Leuven, Kulak Kortrijk Campus, Kortrijk, Belgium, 13/6/2019.

Non-linear ultrasonic imaging for non-destructive testing, Ambassadors Chair Seminar IV, KU Leuven Bruges Campus, Bruges, Belgium, 12/6/2019.

Defect characterisation using ultrasonic arrays, Ambassadors Chair Seminar III, KU Leuven, Kulak Kortrijk Campus, Kortrijk, Belgium, 4/6/2019.

High resolution ultrasonic imaging for non-destructive testing, Ambassadors Chair Seminar II, KU Leuven, Leuven, Belgium, 3/6/2019.

Ultrasonic particle manipulation, Ambassadors Chair Seminar I, KU Leuven Bruges Campus, Bruges, Belgium, 17/5/2019.

Ultrasonic beams: a journey from industrial non-destructive testing to the science of tractor beams, Ambassadors Chair Plenary Lecture, KU Leuven, Kulak Kortrijk Campus, Kortrijk, Belgium, 16/5/2019.

Advances in ultrasonic imaging for non-destructive testing, Keynote at ESIA15-ISSI2019, Cambridge, UK, 9/5/2019.

Ultrasonic particle manipulation and its application across the length scales,
Imperial College, London, 2/5/2019.

Dynamic particle manipulation, Keynote at UK Fluids Network’s 6th Acoustofluidics SIG, Glasgow, 14/3/2019.


Applications of Ultrasound and how to make an Ultrasound Levitator – a lecture demonstration, UCL Science Centre Lectures, London, 23/11/2018.

How to make an acoustic levitation machine, FUTURES Public Talk, We The Curious, Bristol, UK, 28/9/2018.

Accurate non-destructive defect characterisation using ultrasonic measurements, Measurements Lecture 2018, 13th International Conference on Experimental Mechanics, Southampton, UK, 30/8/2018.

Design, manufacture and application of digital space-coiling metamaterials, European Workshop on Acoustic & Mechanical Metamaterials, London, UK, 10/7/18.

Ultrasonic particle manipulation with multi-transducer arrays, Ringberg Symposium 2018 – Detection and actuation at the nano- and microscales in fluids, Tegernsee, Germany, 12/5/2018

Hidden links between array imaging and tractor beams, BINDT Aerospace Event, Filton, UK, 12/4/2018

How to make an acoustic levitator, DTU, Denmark, 22/3/2018

Improving the ability to characterise defects and the impact on structural integrity, IMechE Conference on Structural Integrity Design and Validation Technologies, Manchester, UK, 27/2/2018

Acoustic levitation – from cells to human beings? Portsmouth and District Physical Society/Institute of Physics, Portsmouth, UK, 15/2/2018

Realising digital acoustic metamaterials, DENORMS workshop on Dedicated manufacturing and experimental techniques for acoustic metamaterials and acoustic treatments, Leuven, Belgium, 7/2/2018


3D print your own sonic tractor beam, Pint of Science Students Union, Bristol, UK, 18/9/2017

3D Print Your Own Sonic Tractor Beam, Pint of Science Festival, Bristol, UK, 17/5/2017

Phased Array Ultrasonics, IMechE Conference NDT2017, Sheffield, UK, 21/3/2017

Acoustic Levitation: from cells to human beings, Bath Royal Literary and Science Institution, Bath, UK, 28/1/2017

Ultrasonic tractor beams and tweezers, Engineering Nonlinearity 4th Half-Yearly Meeting, Bristol, 9/1/2017


Ultrasonic manipulation – tweezers and tractor beams, Loughborough University, UK, 13/12/2016

Ultrasonic levitation and manipulation​, President’s Honour Lecture, BINDT Annual NDT Conference, Telford, UK, 13/11/2016

Applications of Ultrasound and how to make an Ultrasound Levitator, UCL Science Centre lectures, London, UK, 4/11/2016

Acoustic levitation as a non-contact manufacturing technology, Advanced Engineering, Birmingham, UK, 2/11/2016

Ultrasonic manipulation – tweezers and tractor beams, ISVR, Southampton, UK, 18/10/2016

Ultrasonic array imaging for NDT, IoP Physical Acoustics Tutorial Series, London, UK, 22/9/2016

Ultrasonic manipulation – tweezers and tractor beams, AES, 2016 Sound Field Control Conference, University of Surrey, UK, 18/7/2016

Building acoustic landscapes with meta-bricks, ICMS Workshop, Metamaterials beyond photonics, Edinburgh, UK, 21/6/2016

Dexterous ultrasonic manipulation devices​, Wave Engineering Bristol, Bristol, UK, 12/1/2016