Publications
74 results found
Dellwig T, Foreman MR, Kao F-J, 2010, Coherent Long-distance Signal Detection Using Stimulated Emission: a Feasibility Study, CHINESE JOURNAL OF PHYSICS, Vol: 48, Pages: 873-884, ISSN: 0577-9073
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- Citations: 10
Foreman MR, Torok P, 2010, Information and resolution in electromagnetic optical systems, PHYS REV A, Vol: 82, Pages: 1-9, ISSN: 1050-2947
Quantitative analysis can play a vital role in a number of polarization-based optical systems, yet to date no definition regarding resolution in the polarization domain exists. By adopting a stochastic framework, a suitable metric is developed in this article, allowing a number of polarimetric systems to be assessed and compared. In so doing, the performance dependencies of polarization-based systems are demonstrated and fundamental trends are identified.
Foreman MR, 2010, Informational limits in optical polarimetry and vectorial imaging
Light has provided the means to learn and gather information about the physical world throughout history. In a world where science moves to smaller scales and more specialised problems however, the boundaries of current technology are continually challenged, motivating the search for more sophisticated systems providing greater information content, sensitivity and increased dimensionality. Utilising the vectorial nature of light presents a promising avenue by which to meet these growing requirements. Polarisation can, for example, be used to transmit information, or alternatively, changes in polarisation induced by an object allow study of previously neglected material properties, such as birefringence and diattenuation.Central to this thesis is thus the characterisation and exploitation of the opportunities afforded by the electromagnetic (i.e. vectorial) nature of light. To this end the work follows three running themes: quantification of polarisation information; formulation of simple propagation tools for electromagnetic waves; and development of specific polarisation based optical systems. Characterising the informational limits inherent to polarisation based systems reduces to considering the uncertainty present in any observations. Uncertainty can, for example, arise from stochastic variation in the polarisation state being measured, or from random noise perturbations upon detection. Both factors are considered and quantified here.Development of vectorial optical systems does, however, pose significant difficulties in modelling, due to mathematical complexity and computational requirements. A number of new tools are hence developed, as prove applicable to a wide variety of applications. Examples are naturally given.To illustrate the potential of polarisation based systems, specific current topics are discussed; namely the growing demand for data storage, and single molecule studies. It will be shown that polarisation, can not only be used to multiplex inform
Foreman MR, Torok P, 2010, Computational methods in vectorial imaging, Journal of Modern Optics, ISSN: 0950-0340
Romero CAM, Van de Nes AS, Foreman MR, et al., 2010, Multiplexed optical data storage and vectorial ray tracing, 1st NanoCharM Workshop on Advanced Polarimetric Instrumentation (API), Publisher: E D P SCIENCES, ISSN: 2100-014X
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- Citations: 1
Foreman MR, Torok P, 2009, Focusing of spatially inhomogeneous partially coherent, partially polarized electromagnetic fields, J OPT SOC AM A, Vol: 26, Pages: 2470-2479, ISSN: 1084-7529
We report a general framework capable of describing the focusing of electromagnetic waves with spatially varying coherence and polarization properties in optical systems of arbitrary numerical aperture and Fresnel number. We also investigate the reduction of the dimensionality of the requisite integrals by use of a coherent mode expansion. We find that coherent mode expansions treating each component of the electric field vector individually are unsuitable for describing focusing systems because of the inter-component mixing that can occur in high numerical aperture systems. In addition, we show that the assumption of harmonic angular dependence allows the azimuthal integration to be performed analytically, providing further simplification of the analysis. We also find that the effective degree of spectral coherence of an electromagnetic beam is unchanged upon focusing. Finally, as an illustration of the developed framework, we calculate the transverse and axial focal distributions for a partially coherent source formed by incoherent superposition of radially and azimuthally polarized Laguerre-Gauss modes. (C) 2009 Optical Society of America
Foreman MR, Toeroek P, 2009, Singular system analysis in electromagnetic focusing problems, 2nd International Workshop on Theoretical and Computational Nanophotonics (TaCoNa-Photonics 2009), Publisher: AMER INST PHYSICS, Pages: 13-13, ISSN: 0094-243X
Foreman MR, Romero CM, Toeroek P, 2008, <i>A priori</i> information and optimisation in polarimetry, OPTICS EXPRESS, Vol: 16, Pages: 15212-15227, ISSN: 1094-4087
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- Citations: 24
Foreman MR, Romero CM, Török P, 2008, Determination of the three-dimensional orientation of single molecules., Opt Lett, Vol: 33, Pages: 1020-1022, ISSN: 0146-9592
A simple method for real-time determination of the full three-dimensional orientation of the emission dipole of single molecules is presented. Introduction of a pi phase step in the back focal plane of the collector lens breaks the inherent symmetry, allowing the longitudinal dipole component to be measured. Experimental tolerances and the consequence of a nonzero bandwidth emission spectrum are also discussed. The scheme also allows for the longitudinal component of an electric field to be found experimentally.
Sherif SS, Foreman MR, Török P, 2008, Eigenfunction expansion of the electric fields in the focal region of a high numerical aperture focusing system, Opt. Express, Vol: 16, Pages: 3397-3407
Foreman MR, Macías Romero C, Török P, 2008, A priori information and optimisation in polarimetry, Opt. Express, Vol: 16, Pages: 15212-15227-15212-15227
Foreman MR, Sherif SS, Munro PRT, et al., 2008, Inversion of the Debye-Wolf diffraction integral using an eigenfunction representation of the electric fields in the focal region, Opt. Express, Vol: 16, Pages: 4901-4917
Foreman MR, Macías Romero C, Török P, 2008, Determination of the three dimensional orientation of single molecules, Opt. Lett., Vol: 33, Pages: 1020-1022
Foreman MR, Sherif SS, Török P, 2007, Photon statistics in single molecule orientational imaging, Opt. Express, Vol: 15, Pages: 13597-13606
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