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We show that light rays moving through slowly-modulated two-dimensional photonic crystals can exhibit complex mixed-stable-chaotic dynamics, which strongly affect the transmission of the corresponding electromagnetic waves. In contrast to previous systems used to realise and exploit optical chaos, the chaotic ray motion that we consider originates from the intrinsically wave-like character of light...
Summary form only given. We consider the semiclassical orbits of cold atoms in an optical lattice with a magnetically-induced harmonic trap. When the laser beams are aligned with a principal axis of the trap, the atoms follow regular classical paths. But when the laser beams are tilted at an angle to the axis, the atoms undergo a controllable transition from regular motion to strong classical chaos...
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