Dr Thomas Han

Senior Lecturer

Physics

Publications

Energy transfer from Cr to Nd in substitutional crystal Y3GaxAl5-x O12 codoped with Nd and Cr
Takagi Kazuki, Yamaga Mitsuo, Villora Encarnacion G., Shimamura Kiyoshi, Hasegawa Kazuo, Ito Hiroshi, Mizuno Shintaro, Takeda Yasuhiko, Han Thomas P J
Journal of Luminescence Vol 169, pp. 65-71, (2016)
http://dx.doi.org/10.1016/j.jlumin.2015.08.044
SNOM characterization of a potential low cost thin gold coated micro-structured grating using a commercial CD substrate
Barrio J., Han T. P J, Lamela J., de las Heras C., Lifante G., Sánchez-Alejo M. A., Camarillo E., Jaque F.
Revista Mexicana de Fisica Vol 61, pp. 428-431, (2015)
Picosecond non-radiative relaxation via internal conversion in Ca10(PO4)F2:Cr
Wells Jon-Paul R., Han Thomas P J
Materials Research Express Vol 1, (2014)
http://dx.doi.org/10.1088/2053-1591/1/2/025706
Resonant energy transfer and cross relaxation between Sm3+ ions in LiYF4 crystals
Yamaga Mitsuo, Uno Hideaki, Tsuda Shin-ichiro, Wells Jon-Paul R., Han Thomas P. J.
Journal of Luminescence Vol 132, pp. 1608-1617, (2012)
http://dx.doi.org/10.1016/j.jlumin.2012.01.028
Persistent phosphorescence in Ce-doped Lu2SiO5
Yamaga Mitsuo, Ohsumi Yusuke, Nakayama Tomomi, Han Thomas P. J.
Optical Materials Express Vol 2, pp. 413-419, (2012)
http://dx.doi.org/10.1364/OME.2.000413
Two-photon excited fluorescence in rare-earth doped optical fiber for applications in distributed sensing of temperature
Dalzell Craig J., Han Thomas P. J., Ruddock Ivan S., Hollis David B.
IEEE Sensors Journal Vol 12, pp. 51-54, (2012)
http://dx.doi.org/10.1109/JSEN.2011.2132797

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Research interests

The research programme combine the inter-related activities of laser spectroscopy and material development in laser gain and nonlinear media.  Linear and non-linear optical spectroscopy of Lanthanide and Transition-metal ions in insulating host remains the back bone of the research activities, in particular two-photon fluorescence, energy transfer processes and order/disorder structures.  Particular areas of interest include the static and dynamic properties of transition-metal and lanthanide ions in low phonon hosts and the applications of linear/non-linear properties of optical materials in guided-wave geometry and nano-crystallites.   Dynamic features dealing with interline and intraline energy transfer processes arising from ion-ion interactions, electron-phonon and phonon-phonon interactions can now be probed directly giving a better understanding of the relaxation processes, pumping cycle and phonon dynamics in laser gain hosts and other optically active materials.   The research areas of energy transfer and energy upconversion lead logically to fluorescence cooling which has potential applications in the optoelectronic industry and bio-labelling/imaging in biomedical when applied to nano size crystallites.  Research activities in recent years have developed into new areas and have expanded from fundamental research to more application oriented research, primarily based on applications of spectroscopic techniques and exploiting the unique properties of the optical materials.

Projects

EPSRC Doctoral Training Grant | Dalzell, Craig John
Han, Thomas (Co-investigator) Dalzell, Craig John (Research Co-investigator)
Period 01-Oct-2007 - 17-Oct-2011
Up-conversion nano-crystallites for application in super-ultra-high definition display technology.
Han, Thomas (Principal Investigator)
Period 01-Oct-2013
Investigation of micro-sized ferroelectric transparent glass ceramics
Han, Thomas (Principal Investigator)
Period 01-Oct-2004 - 30-Sep-2007

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