Research Repository

See what's under the surface


Imaging material texture of as-deposited selective laser melted parts using spatially resolved acoustic spectroscopy (2018)
Journal Article
Patel, R., Hirsch, M., Dryburgh, P., Pieris, D., Achamfuo-Yeboah, S., Smith, R., …Clark, M. (2018). Imaging material texture of as-deposited selective laser melted parts using spatially resolved acoustic spectroscopy. Applied Sciences, 8(10), doi:10.3390/app8101991

Additive manufacturing (AM) is a production technology where material is accumulated to create a structure, often through added shaped layers. The major advantage of additive manufacturing is in creating unique and complex parts for use in areas wher... Read More

Spatially resolved acoustic spectroscopy additive manufacturing: towards online inspection (2018)
Conference Proceeding
Milesh Pieris, D., Patel, R., Dryburgh, P., Hirsch, M., Li, W., Sharples, S. D., …Clark, M. (2018). Spatially resolved acoustic spectroscopy additive manufacturing: towards online inspection. In n/a

High-integrity engineering applications such as aerospace will not permit the incorporation of components containing any structural defects. The current generation of additive manufacturing platforms yield components with relatively high levels of... Read More

Crystallographic texture can be rapidly determined by electrochemical surface analytics (2018)
Journal Article
Speidel, A., Su, R., Mitchell-Smith, J., Dryburgh, P., Bisterov, I., Pieris, D., …Clare, A. T. (2018). Crystallographic texture can be rapidly determined by electrochemical surface analytics. Acta Materialia, 159, 89-101. doi:10.1016/j.actamat.2018.07.059

Orientation affects application-defining properties of crystalline materials. Hence, information in this regard is highly-prized. We show that electrochemical jet processing (EJP), when coupled with accurate metrological appraisal, can characterise c... Read More

Targeted rework of powder bed fusion additive manufacturing (2018)
Conference Proceeding
Dryburgh, P., Patel, R., Catchpole-Smith, S., Hirsch, M., Perry, L., Smith, R. J., …Clare, A. T. (2018). Targeted rework of powder bed fusion additive manufacturing. In Proceedings of LPM2018 - the 19th International Symposium on Laser Precision Microfabrication, #18/030

There is a clear industrial pull to fabricate high value components using premium high temperature aerospace materials by additive manufacturing. Inconveniently, the same materials’ properties which allow them to perform well in service render them... Read More

Active chiral control of GHz acoustic whispering-gallery modes (2017)
Journal Article
Mezil, S., Fujita, K., Osuka, P. H., Tomoda, M., Clark, M., Wright, O. B., & Matsuda, O. (in press). Active chiral control of GHz acoustic whispering-gallery modes. Applied Physics Letters, doi:10.1063/1.4994886. ISSN 0003-6951

We selectively generate chiral surface-acoustic whispering gallery modes in the gigahertz range on a microscopic disk by means of an ultrafast time-domain technique incorporating a spatial light modulator. Active chiral control is achieved by making... Read More

Cell imaging by phonon microscopy: sub-optical wavelength ultrasound for non-invasive imaging (2017)
Journal Article
Perez-Cota, F., Smith, R. J., Moradi, E., Leija, A. L., Velickovic, K., Marques, L., …Clark, M. (2017). Cell imaging by phonon microscopy: sub-optical wavelength ultrasound for non-invasive imaging. ISSN 1439-4243

The mechanical properties of cells play an important role in cell function and behavior. This paper presents recent developments that have enabled the use of laser-generated phonons (ultrasound) with sub-optical wavelengths to look inside living cell... Read More

Size characterisation method and detection enhancement of plasmonic nanoparticles in a pump–probe system (2017)
Journal Article
Fuentes-Domínguez, R., Smith, R. J., Pérez-Cota, F., Marques, L., Peña-Rodríguez, O., & Clark, M. (2017). Size characterisation method and detection enhancement of plasmonic nanoparticles in a pump–probe system. Applied Sciences, 7(8), doi:10.3390/app7080819. ISSN 2076-3417

The optical resonance of metal nanoparticles can be used to enhance the generation and detection of their main vibrational mode. In this work, we show that this method allows the accurate characterisation of the particle’s size because the vibrationa... Read More

Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces (2017)
Journal Article
Colombi, A., Ageeva, V., Smith, R. J., Clare, A. T., Patel, R., Clark, M., …Craster, R. V. (in press). Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces. Scientific Reports, 7, doi:10.1038/s41598-017-07151-6. ISSN 2045-2322

Recent years have heralded the introduction of metasurfaces that advantageously combine the vision of sub-wavelength wave manipulation, with the design, fabrication and size advantages associated with surface excitation. An important topic within met... Read More

Orientation imaging of macro-sized polysilicon grains on wafers using spatially resolved acoustic spectroscopy (2017)
Journal Article
Patel, R., Li, W., Smith, R. J., Sharples, S. D., & Clark, M. (2017). Orientation imaging of macro-sized polysilicon grains on wafers using spatially resolved acoustic spectroscopy. Scripta Materialia, 140, doi:10.1016/j.scriptamat.2017.07.003. ISSN 1359-6462

Due to its economical production process polysilicon, or multicrystalline silicon, is widely used to produce solar cell wafers. However, the conversion efficiencies are often lower than equivalent monocrystalline or thin film cells, with the structur... Read More

High resolution 3D imaging of living cells with sub-optical wavelength phonons (2016)
Journal Article
Perez-Cota, F., Smith, R. J., Moradi, E., Marques, L., Webb, K. F., & Clark, M. (in press). High resolution 3D imaging of living cells with sub-optical wavelength phonons. Scientific Reports, 6, doi:10.1038/srep39326. ISSN 2045-2322

Label-free imaging of living cells below the optical diffraction limit poses great challenges for optical microscopy. Biologically relevant structural information remains below the Rayleigh limit and beyond the reach of conventional microscopes. Supe... Read More

Novel highly sensitive protein sensors based on tapered optical fibres modified with Au-based nanocoatings (2016)
Journal Article
Urrutia, A., Bojan, K., Marques, L., Mullaney, K., Goicoechea, J., James, S., …Tatam, R. (in press). Novel highly sensitive protein sensors based on tapered optical fibres modified with Au-based nanocoatings. Journal of Sensors, 2016, doi:10.1155/2016/8129387. ISSN 1687-725X

Novel protein sensors based on tapered optical fibres modified with Au coatings deposited using two different procedures are proposed. Au-based coatings are deposited onto a nonadiabatic tapered optical fibre using (i) a novel facile method composed... Read More

Thin-film transducers for the detection and imaging of Brillouin oscillations in transmission on cultured cells (2015)
Journal Article
Perez-Cota, F., Smith, R. J., Moradi, E., Webb, K. F., & Clark, M. (in press). Thin-film transducers for the detection and imaging of Brillouin oscillations in transmission on cultured cells. Journal of Physics: Conference Series, 684(1), doi:10.1088/1742-6596/684/1/012003. ISSN 1742-6588

Mechanical imaging and characterisation of biological cells has been a subject of interest for the last twenty years. Ultrasonic imaging based on the scanning acoustic microscope (SAM) and mechanical probing have been extensively reported. Large acou... Read More

Thin-film optoacoustic transducers for the subcellular Brillouin oscillation imaging of individual biological cells (2015)
Journal Article
Perez-Cota, F., Smith, R. J., Moradi, E., Marques, L., Webb, K. F., & Clark, M. (2015). Thin-film optoacoustic transducers for the subcellular Brillouin oscillation imaging of individual biological cells. Applied Optics, 54(28), doi:10.1364/AO.54.008388. ISSN 1559-128X

Mechanical characterisation and imaging of biological tissue has piqued interest in the applicability to cell and tissue biology. One method, based on detection of Brillouin oscillations, has already lead to demonstrations on biological cells using u... Read More

Facile approach to generating polymeric nanoarrays containing populations of nanoparticles (2015)
Journal Article
Marques, L., Chen, X., Roberts, C. J., Clark, M., & Aylott, J. W. (2015). Facile approach to generating polymeric nanoarrays containing populations of nanoparticles. Micro and Nano Letters, 10(8), 378-383. doi:10.1049/mnl.2015.0041

The production of nanoarrays containing a population of entrapped, heterogeneous nanoparticles is reported. The nanoarray consists of a nanoporous film with pores of diameter 60-180 nm, formed from the phase separation of two immiscible polymers: pol... Read More

Optically excited nanoscale ultrasonic transducers (2015)
Journal Article
Smith, R. J., Cota, F. P., Marques, L., Chen, X., Arca, A., Webb, K., …Clark, M. (2015). Optically excited nanoscale ultrasonic transducers. Journal of the Acoustical Society of America, 137(1), doi:10.1121/1.4904487. ISSN 0001-4966

In order to work at higher ultrasonic frequencies, for instance, to increase the resolution, it is necessary to fabricate smaller and higher frequency transducers. This paper presents an ultrasonic transducer capable of being made at a very small siz... Read More

Spatially resolved acoustic spectroscopy for rapid imaging of material microstructure and grain orientation (2014)
Journal Article
Smith, R. J., Li, W., Coulson, J., Clark, M., Somekh, M. G., & Sharples, S. D. (2014). Spatially resolved acoustic spectroscopy for rapid imaging of material microstructure and grain orientation. Measurement Science and Technology, 25(5), doi:10.1088/0957-0233/25/5/055902. ISSN 0957-0233

Measuring the grain structure of aerospace materials is very important to understand their mechanical properties and in-service performance. Spatially resolved acoustic spectroscopy is an acoustic technique utilizing surface acoustic waves to map the... Read More

Ultrastable heterodyne interferometer system using a CMOS modulated light camera (2012)
Journal Article
Patel, R., Achamfuo-Yeboah, S., Light, R., & Clark, M. (2012). Ultrastable heterodyne interferometer system using a CMOS modulated light camera. Optics Express, 20(16), doi:10.1364/OE.20.017722. ISSN 1094-4087

A novel ultrastable widefield interferometer is presented. This uses a modulated light camera (MLC) to capture and stabilise the interferogram in the widefield heterodyne interferometer. This system eliminates the contribution of piston phase to the... Read More

Widefield heterodyne interferometry using a custom CMOS modulated light camera (2011)
Journal Article
Patel, R., Achamfuo-Yeboah, S., Light, R., & Clark, M. (2011). Widefield heterodyne interferometry using a custom CMOS modulated light camera. Optics Express, 19(24), doi:10.1364/OE.19.024546. ISSN 1094-4087

In this paper a method of taking widefield heterodyne inter- ferograms using a prototype modulated light camera is described. This custom CMOS modulated light camera (MLC) uses analogue quadrature demodulation at each pixel to output the phase and am... Read More