Outputs (22)

A General Description of the Performance of Surface Plasmon Sensors Using a Transmission Line Resonant Circuit Model (2019)
Journal Article
Shen, M., & Somekh, M. G. (2019). A General Description of the Performance of Surface Plasmon Sensors Using a Transmission Line Resonant Circuit Model. IEEE Sensors Journal, 19(23), 11281-11288. https://doi.org/10.1109/jsen.2019.2933320

We analyze the response of surface plasmon (SP) sensors using a transmission line model. We illustrate this analysis with particular reference to a layered structure in which plasmon hybridization occurs. By applying the appropriate resonant conditio... Read More about A General Description of the Performance of Surface Plasmon Sensors Using a Transmission Line Resonant Circuit Model.

Application of confocal surface wave microscope to self-calibrated attenuation coefficient measurement by Goos-Hänchen phase shift modulation (2018)
Journal Article
Pechprasarn, S., Chow, T. W. K., & Somekh, M. G. (2018). Application of confocal surface wave microscope to self-calibrated attenuation coefficient measurement by Goos-Hänchen phase shift modulation. Scientific Reports, 8, Article 8547. https://doi.org/10.1038/s41598-018-26424-2

In this paper, we present a direct method to measure surface wave attenuation arising from both ohmic and coupling losses using our recently developed phase spatial light modulator (phase-SLM) based confocal surface plasmon microscope. The measuremen... Read More about Application of confocal surface wave microscope to self-calibrated attenuation coefficient measurement by Goos-Hänchen phase shift modulation.

Analysis of noise in differential and ratiometric biosensing systems (2018)
Journal Article
Abayzeed, S., Smith, R. J., See, C. W., & Somekh, M. G. (2018). Analysis of noise in differential and ratiometric biosensing systems. Sensors and Actuators B: Chemical, 260, 1059-1067. https://doi.org/10.1016/j.snb.2018.01.004

This paper presents formulations to evaluate noise in differential and ratiometric measurements that are often performed in biosensing. These measurements are performed to improve signal to noise ratio of the sensing systems for sensitive detection o... Read More about Analysis of noise in differential and ratiometric biosensing systems.

Sensitive detection of voltage transients using differential intensity surface plasmon resonance system (2017)
Journal Article
Abayzeed, S. A., Smith, R. J., Webb, K. F., Somekh, M. G., & See, C. W. (2017). Sensitive detection of voltage transients using differential intensity surface plasmon resonance system. Optics Express, 25(25), 31552-31567. https://doi.org/10.1364/OE.25.031552

This paper describes theoretical and experimental study of the fundamentals of using surface plasmon resonance (SPR) for label-free detection of voltage. Plasmonic voltage sensing relies on the capacitive properties of metal-electrolyte interface tha... Read More about Sensitive detection of voltage transients using differential intensity surface plasmon resonance system.

Sub-100 nm resolution microscopy based on proximity projection grating scheme (2015)
Journal Article
Hu, F., Somekh, M. G., Albutt, D. J., Webb, K., Moradi, E., & See, C. W. (2015). Sub-100 nm resolution microscopy based on proximity projection grating scheme. Scientific Reports, 5, Article 8589. https://doi.org/10.1038/srep08589

Structured illumination microscopy (SIM) has been widely used in life science imaging applications. The maximum resolution improvement of SIM, compared to conventional bright field system is a factor of 2. Here we present an approach to structured il... Read More about Sub-100 nm resolution microscopy based on proximity projection grating scheme.

Ultrastable embedded surface plasmon confocal interferometry (2014)
Journal Article
Pechprasarn, S., Zhang, B., Albutt, D., Zhang, J., & Somekh, M. (2014). Ultrastable embedded surface plasmon confocal interferometry. Light: Science and Applications, 3(7), Article e187. https://doi.org/10.1038/lsa.2014.68

As disease diagnosis becomes more sophisticated, there is a requirement to measure small numbers of molecules attached to, for instance, an antibody. This requires a sensor capable not only of high sensitivity but also the ability to make measurement... Read More about Ultrastable embedded surface plasmon confocal interferometry.

Surface plasmon microscopic sensing with beam profile modulation (2012)
Journal Article
Zhang, B., Pechprasarn, S., & Somekh, M. G. (2012). Surface plasmon microscopic sensing with beam profile modulation. Optics Express, 20(27), https://doi.org/10.1364/OE.20.028039

Surface Plasmon microscopy enables measurement of local refractive index on a far finer scale than prism based systems. An interferometric or confocal system gives the so-called V(z) curve when the sample is scanned axially, which gives a measure of... Read More about Surface plasmon microscopic sensing with beam profile modulation.

Determination of crystallographic orientation of large grain metals with surface acoustic waves (2012)
Journal Article
Li, W., Sharples, S. D., Smith, R. J., Clark, M., & Somekh, M. G. (2012). Determination of crystallographic orientation of large grain metals with surface acoustic waves. Journal of the Acoustical Society of America, 132(2), 738-745. https://doi.org/10.1121/1.4731226

A previously described laser ultrasonic technique known as spatially resolved acoustic spectroscopy (SRAS) can be used to image surface microstructure, using the local surface acoustic wave (SAW) velocity as a contrast mechanism. It is shown here tha... Read More about Determination of crystallographic orientation of large grain metals with surface acoustic waves.

Confocal surface plasmon microscopy with pupil function engineering (2012)
Journal Article
Zhang, B., Pechprasarn, S., Zhang, J., & Somekh, M. G. (2012). Confocal surface plasmon microscopy with pupil function engineering. Optics Express, 20(7), https://doi.org/10.1364/OE.20.007388

Surface Plasmon microscopy can measure local changes of refractive index on the micron scale. Interferometric plasmon imaging delivers quantitative high spatial resolution sensitive to refractive index. In addition the so called V(z) method allows im... Read More about Confocal surface plasmon microscopy with pupil function engineering.

CHOTs optical transducers (2011)
Journal Article
Arca, A., Aylott, J., Marques, L., Clark, M., Somekh, M., Smith, R., Sharples, S., Stratoudaki, T., & Chen, X. (2011). CHOTs optical transducers. Nondestructive Testing and Evaluation, 26(3-4), 353-366. https://doi.org/10.1080/10589759.2011.573555

Laser ultrasonics conventionally use direct absorption in the sample to generate ultrasound and monitor the sample to detect the ultrasound. However, in some circumstances there are significant advantages to using an optical transducer - a device to... Read More about CHOTs optical transducers.