The control of near-field optics: imposing direction through coupling with off-resonant laser light |
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Authors: | D S Bradshaw and D L Andrews |
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Institution: | (1) Nanostructures and Photomolecular Systems, School of Chemical Sciences, University of East Anglia, Norwich, NR4 7TJ, UK |
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Abstract: | The well-known spatially distributed form of the near field, associated with a dipolar source, is usually unsuitable for effecting
the excitation of a location-specific detector in the vicinity. It is of interest, therefore, to identify a means of producing
a much more greatly directed character to such a near field, imposing features that are more commonly associated with longer-range,
wave-zone electromagnetic propagation. In this paper, it is shown that nonlinear optical coupling with off-resonant, throughput
laser light can achieve this effect. Based on a quantum electrodynamical analysis it is shown that two mechanisms contribute;
one requires both the source and detector to be irradiated by the throughput radiation, the other can operate with the source
alone irradiated. The analysis leads to results identifying the dependence of each mechanism on the relative directions of
the laser beam and the source–detector displacement. Contour maps of the ensuing near field, at the source emission frequency,
exhibit a directionality that grows with the off-resonant beam intensity. The phenomenon affords a means of achieving optical
control over the near-field distribution. |
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Keywords: | PACS" target="_blank">PACS 42 25 Bs 42 50 Ct 33 80 -b 03 70 +k |
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