Matthew S. Mills

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We observe optical trapping and manipulation of dielectric microparticles using autofocusing radially symmetric Airy beams. This is accomplished by exploiting either the inward or outward transverse acceleration associated with their chirped wavefronts. We experimentally demonstrate, for the first time to our knowledge, that such Airy beams morph into(More)
We show that new families of diffraction-free nonparaxial accelerating optical beams can be generated by considering the symmetries of the underlying vectorial Helmholtz equation. Both two-dimensional transverse electric and magnetic accelerating wave fronts are possible, capable of moving along elliptic trajectories. Experimental results corroborate these(More)
Plasma channels produced in air through femtosecond laser filamentation 1–4 hold great promise for a number of applications , including remote sensing 5 , attosecond physics 6,7 and spectroscopy 8 , channelling microwaves 9–12 and lightning protection 13. In such settings, extended filaments are desirable, yet their longitudinal span is limited by(More)
In this Letter we show that by appropriately providing an auxiliary "dress" beam one can extend the longevity of an optical filament by almost one order of magnitude. These optical dressed filaments can propagate substantially further by judiciously harnessing energy from their secondary beam reservoir. This possibility is theoretically investigated in air(More)
We performed a randomized controlled trial of the effect of intravenous ¯uid preload on maternal hypotension and fetal heart rate (FHR) changes in labour after the ®rst epidural injection. Group 1 (49 women) received 1 litre of crystalloid preload. Group 2 (46 women) received no preload. No statistically signi®cant difference was shown between the two(More)
We experimentally demonstrate the generation of an array of optical bottle beams by employing multiple self-accelerating Airy beams. This kind of optical bottle array is created by superimposing eight Airy beams along a circle, all with inward acceleration directed towards the center. In addition, we demonstrate stable trapping of multiple absorbing glassy(More)
We introduce a class of propagation invariant spatiotemporal optical wave packets with spherical harmonic symmetries in their field configurations. The evolution of these light orbitals is considered theoretically in anomalously dispersive media, and their spinning dynamics are analyzed in terms of their corresponding energy flows. Similarly, localized(More)
Figure 1| The paraxial wave equation accounts for only í µí±˜-vectors which are primarily in the í µí± § direction – a good approximation for laser light.. Figure 2| The intensity of a Gaussian beam suffering diffraction as it propagates. By half a meter of propagation, the beam has spread out and the peak intensity has diminished to approximately half its(More)
We show that a weak Airy pulse can be used to manipulate the dynamics of an optical soliton when propagating at a different wavelength. Our results indicate that an Airy wave packet is considerably more effective in controlling the arrival time of a soliton than a corresponding Gaussian pulse. The nature of these interactions is systematically explored as a(More)
We demonstrate optical interactions between stable self-trapped optical beams in soft-matter systems with pre-engineered saturable self-focusing optical nonlinearities. Our experiments, carried out in dilute suspensions of particles with negative polarizabilities, show that optical beam interactions can vary from attractive to repulsive, or can display an(More)