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Student difficulties regarding symbolic and graphical representations of vector fields (2017)
Journal Article
Bollen, L., van Kampen, P., Baily, C., Kelly, M., & De Cock, M. (2017). Student difficulties regarding symbolic and graphical representations of vector fields. Physical Review Physics Education Research, 13(2), doi:10.1103/PhysRevPhysEducRes.13.020109

The ability to switch between various representations is an invaluable problem-solving skill in physics. In addition, research has shown that using multiple representations can greatly enhance a person’s understanding of mathematical and physical con... Read More about Student difficulties regarding symbolic and graphical representations of vector fields.

Optical diagnostics of laser-produced aluminium plasmas under water (2017)
Journal Article
Walsh, N., Costello, J. T., & Kelly, T. J. (2017). Optical diagnostics of laser-produced aluminium plasmas under water. Applied physics. B, Lasers and optics, 123(6), doi:10.1007/s00340-017-6754-3

We report on the findings of double-pulse studies performed on an aluminium target submerged in water using Nd:YAG laser pulses. Shadowgraphy measurements were performed to examine the dynamic behaviour of the cavitation bubble that eventually forms... Read More about Optical diagnostics of laser-produced aluminium plasmas under water.

Time resolved anisotropic emission from an aluminium laser produced plasma (2017)
Journal Article
Wubetu, G. A., Fiedorowicz, H., Costello, J. T., & Kelly, T. J. (2017). Time resolved anisotropic emission from an aluminium laser produced plasma. Physics of Plasmas, 24(1), 013105. https://doi.org/10.1063/1.4973444

The polarisation anisotropy of the emission from a laser produced aluminium plasma has been studied using time and polarisation resolved spectroscopy at various background pressures of air. A Wollaston prism was used to resolve the emission from the... Read More about Time resolved anisotropic emission from an aluminium laser produced plasma.

A simple, low cost interferometric autocorrelator with no moving parts (2016)
Journal Article
Kelly, T. J., Davitt, S. J., & Costello, J. T. (2016). A simple, low cost interferometric autocorrelator with no moving parts. Measurement Science and Technology, 27(11), 117003. doi:10.1088/0957-0233/27/11/117003

The design and implementation of a low cost interferometric autocorrelator with no moving parts is discussed. It is found that the device is optically simple, uses low cost components and self aligns. The device is used to measure the interferometric... Read More about A simple, low cost interferometric autocorrelator with no moving parts.

Two-electron processes in multiple ionization under strong soft-x-ray radiation (2016)
Journal Article
Ilchen, M., Mazza, T., Karamatskos, E. T., Markellos, D., Bakhtiarzadeh, S., Rafipoor, A. J., …Meyer, M. (2016). Two-electron processes in multiple ionization under strong soft-x-ray radiation. Physical Review A, 94(1), 013413-1-013413-11. doi:10.1103/PhysRevA.94.013413

In a combined experimental and theoretical study we have investigated the ionization of atomic argon upon irradiation with intense soft-x-ray pulses of 105 eV photon energy from the free-electron laser FLASH. The measured ion yields show charge state... Read More about Two-electron processes in multiple ionization under strong soft-x-ray radiation.

Localized surface plasmon effects in ZnO sandwiched gold nanoparticles under fs pumping (2015)
Conference Proceeding
Bongu, S. R., Bisht, P. B., Namboodri, R. C., Ali, S. A., Kelly, T. J., Costello, J. T., …Kasiviswanathan, S. (2015). Localized surface plasmon effects in ZnO sandwiched gold nanoparticles under fs pumping. In 2015 IEEE Photonics Conference (IPC), 212-213. doi:10.1109/IPCon.2015.7323479

Nonlinear optical properties of gold nanoparticles (AuNPs) embedded ZnO thin films have been studied at 400 nm. While the AuNPs thin film shows the effect of saturable absorption, AuNPs embedded ZnO film exhibits the RSA behaviour.

Enhanced two photon absorption cross section and optical nonlinearity of a quasi-octupolar molecule (2015)
Journal Article
Namboodiri, C., Bongu, S., Bisht, P., Mukkamala, R., Chandra, B., Aidhen, I., …Costello, J. (2016). Enhanced two photon absorption cross section and optical nonlinearity of a quasi-octupolar molecule. Journal of Photochemistry and Photobiology A: Chemistry, 314, 60-65. doi:10.1016/j.jphotochem.2015.08.016

Two photon absorption (2PA) cross sections of two quasi-octupolar molecules (E,E,E)-2,4,6-tris [2-(4-N,N-diphenylaminophenyl)vinyl]pyridine (DPATSP) and (2,4,6-tris((E)-4-(diphenylamino)styryl)-1-methylpyridine-1-ium iodide, DPATSP-Me) have been esti... Read More about Enhanced two photon absorption cross section and optical nonlinearity of a quasi-octupolar molecule.

Advanced undergraduate RC circuits: An experimentalist's perspective (2015)
Journal Article
Kelly, T. J. (2015). Advanced undergraduate RC circuits: An experimentalist's perspective. European Journal of Physics, 36(5), 055041. doi:10.1088/0143-0807/36/5/055041

In this paper, an advanced undergraduate RC circuit is studied in two different ways. The circuit is a typical series RC circuit with a time-varying voltage source. The temporal profile of the voltage is an isolated, Gaussian shaped pulse. The voltag... Read More about Advanced undergraduate RC circuits: An experimentalist's perspective.

Sensitivity of nonlinear photoionization to resonance substructure in collective excitation (2015)
Journal Article
Mazza, T., Karamatskou, A., Ilchen, M., Bakhtiarzadeh, S., Rafipoor, A. J., O’Keeffe, P., …Santra, R. (2015). Sensitivity of nonlinear photoionization to resonance substructure in collective excitation. Nature communications, 6(1), 6799-1-6799-6. https://doi.org/10.1038/ncomms7799

Collective behaviour is a characteristic feature in many-body systems, important for developments in fields such as magnetism, superconductivity, photonics and electronics. Recently, there has been increasing interest in the optically nonlinear respo... Read More about Sensitivity of nonlinear photoionization to resonance substructure in collective excitation.

Detection limits of organic compounds achievable with intense, short-pulse lasers (2015)
Journal Article
Miles, J., De Camillis, S., Alexander, G., Hamilton, K., Kelly, T. J., Costello, J. T., …Greenwood, J. B. (2015). Detection limits of organic compounds achievable with intense, short-pulse lasers. The Analyst, 140(12), 4270-4276. doi:10.1039/c5an00529a

Many organic molecules have strong absorption bands which can be accessed by ultraviolet short pulse lasers to produce efficient ionization. This resonant multiphoton ionization scheme has already been exploited as an ionization source in time-of-fli... Read More about Detection limits of organic compounds achievable with intense, short-pulse lasers.

Influence of localized surface plasmons on Pauli blocking and optical limiting in graphene under femtosecond pumping (2014)
Journal Article
Bongu, S. R., Bisht, P. B., Namboodiri, R. C. K., Nayak, P., Ramaprabhu, S., Kelly, T. J., …Costello, J. T. (2014). Influence of localized surface plasmons on Pauli blocking and optical limiting in graphene under femtosecond pumping. Journal of applied physics, 116(7), 073101. doi:10.1063/1.4893547

The Pauli blocking limit and optical limiting threshold have been found to be modified following silver-nanoparticle decoration of functionalized hydrogen induced exfoliated graphene. Femtosecond Z-scan experiments have been used to measure the Pauli... Read More about Influence of localized surface plasmons on Pauli blocking and optical limiting in graphene under femtosecond pumping.


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