Outputs (298)

Surface anchoring structure of a liquid crystal monolayer studied via dual polarisation interferometry (2009)
Journal Article
Tan, O., & Cross, G. H. (2009). Surface anchoring structure of a liquid crystal monolayer studied via dual polarisation interferometry. Physical review E: Statistical, nonlinear, and soft matter physics, 79(2), Article 021703. https://doi.org/10.1103/physreve.79.021703

The self-organization of liquid crystal molecules of 4-n-pentyl-4′-cyanobiphenyl (5CB) forming an oriented monolayer by condensation from the vapor phase onto a silicon oxynitride surface has been observed using the evanescent wave dual slab waveguid... Read More about Surface anchoring structure of a liquid crystal monolayer studied via dual polarisation interferometry.

A versatile and reliably re-usable ultra-high vacuum viewport (2009)
Journal Article
Weatherill, K., Pritchard, J., Griffin, P., Dammalapati, U., Adams, C., & Riis, E. (2009). A versatile and reliably re-usable ultra-high vacuum viewport. Review of Scientific Instruments, 80(2), https://doi.org/10.1063/1.3075547

We present a viewport for use in ultrahigh vacuum (UHV) based upon the preflattened solder seal design presented in earlier work [ Cox et al., Rev. Sci. Instrum. 74, 3185 (2003) ]. The design features significant modifications to improve long term pe... Read More about A versatile and reliably re-usable ultra-high vacuum viewport.

Thermally induced rotation of 3d orbital stripes in Pr(Sr0.1Ca0.9)(2)Mn2O7 (2009)
Journal Article
Beale, T., Bland, S., Johnson, R., Hatton, P., Cezar, J., Dhesi, S., …Boothroyd, A. (2009). Thermally induced rotation of 3d orbital stripes in Pr(Sr0.1Ca0.9)(2)Mn2O7. Physical review B, 79(5), Article 054433. https://doi.org/10.1103/physrevb.79.054433

We have investigated orbital ordering in the bilayer manganite, Pr(Sr0.1Ca0.9)2Mn2O7, using synchrotron x-ray diffraction techniques, in particular resonant soft x-ray diffraction. Diffraction signals are observed at (0,12,0) above 300 K and (12,0,0)... Read More about Thermally induced rotation of 3d orbital stripes in Pr(Sr0.1Ca0.9)(2)Mn2O7.

Fractional resonances in the atom-optical delta-kicked accelerator (2009)
Journal Article
Saunders, M., Halkyard, P., Gardiner, S., & Challis, K. (2009). Fractional resonances in the atom-optical delta-kicked accelerator. Physical Review A, 79(2), https://doi.org/10.1103/physreva.79.023423

We consider resonant dynamics in a dilute atomic gas falling under gravity through a periodically pulsed standing-wave laser field. Our numerical calculations are based on a Monte Carlo method for an incoherent mixture of noninteracting plane waves,... Read More about Fractional resonances in the atom-optical delta-kicked accelerator.

Optical Tamm states above the bulk plasma frequency at a Bragg stack/metal interface (2009)
Journal Article
Brand, S., Kaliteevski, M., & Abram, R. (2009). Optical Tamm states above the bulk plasma frequency at a Bragg stack/metal interface. Physical review B, 79(8), Article 085416. https://doi.org/10.1103/physrevb.79.085416

We demonstrate theoretically that surface-plasmon polaritons, a form of optical Tamm state, can occur at the interface between a metal and a Bragg reflector at frequencies above the bulk plasma frequency of the metal. The frequencies of the excitatio... Read More about Optical Tamm states above the bulk plasma frequency at a Bragg stack/metal interface.

Ultrafast laser inscription: an enabling technology for astrophotonics (2009)
Journal Article
Thomson, R., Kar, A., & Allington-Smith, J. (2009). Ultrafast laser inscription: an enabling technology for astrophotonics. Optics Express, 17(3), 1963-1969. https://doi.org/10.1364/oe.17.001963

The application of photonics to astronomy offers major advantages in the area of highly-multiplexed spectroscopy, especially when applied to extremely large telescopes. These include the suppression of the near-infrared night-sky spectrum [J. Bland-H... Read More about Ultrafast laser inscription: an enabling technology for astrophotonics.

How weak is a weak probe in laser spectroscopy? (2009)
Journal Article
Sherlock, B., & Hughes, I. (2009). How weak is a weak probe in laser spectroscopy?. American Journal of Physics, 77(2), 111-115. https://doi.org/10.1119/1.3013197

Laser spectroscopy experiments are often conducted with a probe that does not significantly alter the medium’s properties. For a two-level atom a clear measure of the strength of a probe beam in terms of the saturation intensity is known. We show tha... Read More about How weak is a weak probe in laser spectroscopy?.

Dependence of domain wall pinning potential landscapes on domain wall chirality and pinning site geometry in planar nanowires (2009)
Journal Article
Bogart, L., Atkinson, D., O'Shea, K., McGrouther, D., & McVitie, S. (2009). Dependence of domain wall pinning potential landscapes on domain wall chirality and pinning site geometry in planar nanowires. Physical review B, 79(5), Article 054414. https://doi.org/10.1103/physrevb.79.054414

We report on domain wall pinning behavior and the potential-energy landscapes created by notches of two different geometries in planar Permalloy nanowires. Domain wall depinning was probed experimentally using spatially resolved magneto-optical Kerr... Read More about Dependence of domain wall pinning potential landscapes on domain wall chirality and pinning site geometry in planar nanowires.

The photophysics of singlet, triplet, and degradation trap states in 4,4-N,N-'-dicarbazolyl-1,1(')-biphenyl (2009)
Journal Article
Jankus, V., Winscom, C., & Monkman, A. (2009). The photophysics of singlet, triplet, and degradation trap states in 4,4-N,N-'-dicarbazolyl-1,1(')-biphenyl. The Journal of Chemical Physics, 130(7), Article 074501. https://doi.org/10.1063/1.3077163

In this paper we report the results of optical characterization of 4,4-N,N-'-dicarbazolyl-1,1(')-biphenyl (CBP), known as a host material for phosphorescent light emitting devices. Using absorption, steady state, and time-resolved spectroscopy, we ex... Read More about The photophysics of singlet, triplet, and degradation trap states in 4,4-N,N-'-dicarbazolyl-1,1(')-biphenyl.

The Influence of Alkyl-Chain Length on Beta-Phase Formation in Polyfluorenes. (2009)
Journal Article
Bright, D., Dias, F., Galbrecht, F., Scherf, U., & Monkman, A. (2009). The Influence of Alkyl-Chain Length on Beta-Phase Formation in Polyfluorenes. Advanced Functional Materials, 19(1), 67-73. https://doi.org/10.1002/adfm.200800313

Di-n-alkyl substituted polyfluorenes with alkyl chain lengths of 6, 7, 8, 9, and 10 carbon atoms (PF6, PF7, PF8, PF9, and PF10) are studied in dilute solution in MCH using optical spectroscopy. Beta-phase is formed upon cooling in solutions (∼ 7 µg m... Read More about The Influence of Alkyl-Chain Length on Beta-Phase Formation in Polyfluorenes..