All Outputs (28)

A photographic methodology for analysing bit position under rein tension (2018)
Journal Article

Bits are a common and invasive piece of equipment used in equestrian sports. A bit should be carefully chosen to suit the individual horse according to the pressure points it is willing to accept. Bit pressure is poorly understood due to a lack of ac... Read More about A photographic methodology for analysing bit position under rein tension.

Fundamental limit to the use of effective medium theories in optics (2013)
Journal Article

The effective medium refractive index of a surface-bound submonolayer of polystyrene nanospheres in water is found to be ill-defined below a rather specific sphere occupied area limit. The submonolayer takes on a recognizable thickness and refractive... Read More about Fundamental limit to the use of effective medium theories in optics.

Wavelength-dependent frustrated internal reflection via photonic interface states (2011)
Journal Article

Conventional frustrated internal reflection in which light is able to tunnel across a small air gap between two prisms is a well known phenomenon. In this work, an experimental proof-of-concept demonstration of a polarization and highly wavelength se... Read More about Wavelength-dependent frustrated internal reflection via photonic interface states.

Understanding the optical spectroscopy of amphiphilic molecular rectifiers: A density functional approach (2010)
Journal Article

We present results of first principles density functional theory calculations of the electronic and atomic structural properties of model Z-type Langmuir–Blodgett (LB) layers comprising amphiphilic quinolinium tricyanoquinodimethanide (Q3CNQ) chromop... Read More about Understanding the optical spectroscopy of amphiphilic molecular rectifiers: A density functional approach.

Surface anchoring structure of a liquid crystal monolayer studied via dual polarisation interferometry (2009)
Journal Article

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.

Accurate determination and modeling of the dispersion of the first hyperpolarizability of an efficient zwitterionic nonlinear optical chromophore by tunable wavelength hyper-Rayleigh scattering (2008)
Journal Article

Dual Polarization Interferometry: A Real-Time Optical Technique for Measuring (Bio)molecular Orientation, Structure and Function at the Solid/Liquid Interface (2007)
Book Chapter

The measurement of proteins, their structure, and function is a crucial step in the characterization, understanding, and utilization of many biological processes. Highly sophisticated structural and functional measurement techniques have been develop... Read More about Dual Polarization Interferometry: A Real-Time Optical Technique for Measuring (Bio)molecular Orientation, Structure and Function at the Solid/Liquid Interface.

Universal method to determine the thermo-optic coefficient of optical waveguide layer materials using a dual slab waveguide (2007)
Journal Article

A dual slab waveguide device method for determining the thermo-optic coefficient of waveguide layer materials is demonstrated. Temperature change-induced optical path length imbalance between two single slab waveguide modes provides the primary mecha... Read More about Universal method to determine the thermo-optic coefficient of optical waveguide layer materials using a dual slab waveguide.

Guest-host interactions between dichroic dyes and anisotropic hosts. (2006)
Journal Article

The guest–host interaction between dichroic dyes and anistropic hosts has been investigated by means of optical spectroscopy. Two different TCNQ adducts; 2-{4-[(2,6-dimethylmorpholin-4-yl)(4-metylpiperidin-1-yl)methylene]cyclohexa-2,5-dien-1-ylidene}... Read More about Guest-host interactions between dichroic dyes and anisotropic hosts..

The metrics of surface adsorbed small molecules on the Young's fringe dual-slab waveguide interferometer (2004)
Journal Article

A method for analysing thin films using a dual-waveguide interferometric technique is described. Alternate dual polarization addressing of the interferometer sensor using a ferroelectric liquid crystal polarization switch allowed the opto-geometrical... Read More about The metrics of surface adsorbed small molecules on the Young's fringe dual-slab waveguide interferometer.

A new quantitative optical biosensor for protein characterisation (2003)
Journal Article

A new optical biosensor is described based on a dual waveguide interferometric technique. By addressing the waveguide structure with alternate polarisations the optogeometrical properties (density and thickness) of adsorbed protein layers at the sens... Read More about A new quantitative optical biosensor for protein characterisation.

Local field and aggregation dependence of the micro- and macroscopic optical non-linearity of zwitterionic molecules (2003)
Journal Article

When a dipolar-conjugated molecule can lower its energy through gaining aromaticity, there can be a quite dramatic evolution of its polarisation properties dependent on the local reaction field generated in its environment. We have studied conjugated... Read More about Local field and aggregation dependence of the micro- and macroscopic optical non-linearity of zwitterionic molecules.

Orientation and solvatochromism of dyes in liquid crystals (2003)
Journal Article

The orientation and solvatochromism of some dye molecules in a liquid crystal have been investigated. Interactions with the host and the structure of the dye molecule affect the macroscopic alignment of dichroic dye molecules in a liquid crystal: It... Read More about Orientation and solvatochromism of dyes in liquid crystals.

Diode laser wavelength tracking using an integrated dual slab waveguide interferometer (2002)
Journal Article

The problem of tracking small changes in the output wavelength of laser diodes is addressed using a dual slab waveguide interferometer fabricated from silicon oxynitride. Waveguide mode dispersion differences between the waveguide modes provide a mec... Read More about Diode laser wavelength tracking using an integrated dual slab waveguide interferometer.

Photophysics of a fluorene co-polymer in solution and films. (2002)
Journal Article

The photophysical properties of a new light-emitting co-polymer of fluorene and di-alkoxyphenylene are reported. A range of optical spectroscopies were applied to both solutions and solid films, and comparing the results gives information about the e... Read More about Photophysics of a fluorene co-polymer in solution and films..

Charge-density study of the nonlinear optical precursor DED-TCNQ at 20 K (2002)
Journal Article

A charge-density study of the nonlinear-optical (NLO) precursor {4-[bis(diethylamino)-methylium] phenyl}dicyanomethanide (DED-TCNQ), space group P21/c, a=11.174(2)Å; b=12.859(2)Å; c=12.486(2)Å; β=112.00(1)°, is presented. The results derive from a su... Read More about Charge-density study of the nonlinear optical precursor DED-TCNQ at 20 K.

Matrix dependence of light emission from TCNQ adducts (2001)
Journal Article

The reactions of primary and secondary amines with 7,7,8,8-tetracyano-p-quinodimethane(TCNQ) lead to mono- and di-substituted adducts. Fluorescence emission has been observed for several of these compounds. The luminescence property of the TCNQ adduc... Read More about Matrix dependence of light emission from TCNQ adducts.

Waveguide Photodegradation Of Nonlinear Optical Organic Chromophores In Polymeric Films (2000)
Journal Article

Refractometric discrimination of void-space filling and swellingduring vapour sorption in polymer films (2000)
Journal Article

Thin polymeric films have been deposited as upper cladding layers on a new integrated optical interferometer fabricated from layers of silicon oxynitride on a silicon wafer. The evanescent field of the probing waveguide mode transduces refractive ind... Read More about Refractometric discrimination of void-space filling and swellingduring vapour sorption in polymer films.

Crystal Structures Of Amino Substituted Dicyanoquinodimethanes With Potential Nonlinear Optical Applications (1999)
Journal Article