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Professor Sir Michael Berry

H H Wills Physics Laboratory, University of Bristol, UK

Nature's optics and our understanding of light

Venue: Department of Physics Faculty of Science, room F08. Time:  15.15

Sir Berry will give two talks at the Department of Physics Faculty of Science. First a colloquium for a general physics audience on Wednesday March 21st, and next a theoretical physics talk on Thursday March 22nd.

Dear colleagues,

it is my pleasure to announce the visit of Sir Michael Berry to Zagreb.

Sir Berry will give two talks at the Department of Physics Faculty of Science. First a colloquium for a general physics audience on Wednesday March 21st, and next a theoretical physics talk on Thursday March 22nd.

The visit is organized within the QuantiXLie Center of Excellence.

The places, times, titles and abstracts of the talks are below (and

attached):

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Colloquium

Venue: Department of Physics Faculty of Science, room F08

Time:  15.15

Nature's optics and our understanding of light

Michael Berry,

H H Wills Physics Laboratory, University of Bristol, UK

Optical phenomena visible to everyone abundantly illustrate important concepts in science and mathematics. The phenomena considered include rainbows, sparkling reflections on water, green flashes, earthlight on the moon, glories, daylight, crystals, and the squint moon. The concepts include refraction, wave interference, numerical experiments, asymptotics, Regge poles, polarization singularities, conical intersections, and visual illusions.

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Theoretical Physics Seminar

Optical curl forces and beyond

Michael Berry,

H H Wills Physics Laboratory, University of Bristol, UK

A physical example of a force that depends on position but is not derivable from a potential, that is, a nonconservative force with non-zero curl, is the force on an absorbing dielectric particle in an optical field. The resulting dynamics need not be Hamiltonian or Lagrangian, yet is non-dissipative, with unfamiliar chaotic dynamics. Noethers theorem does not apply, so the link between symmetries and conservation laws is broken. Although unambiguous in optics, the physical existence of curl forces has been controversial among engineers. Motion under curl forces near optical vortices can be understood in detail, and the full series of superadiabatic correction forces derived, leading to an exact slow manifold in which fast (internal) and slow (external) motion of the particle is separated. These classical optical forces have quantum effects.

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See you there

Hrvoje Buljan

Autor: webmaster FO
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