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We demonstrate strong optical activity (and circular dichroism) for both microwave and photonic achiral planar metamaterials. The effect arises from extrinsic chirality resulting from oblique incidence of light onto the metamaterial structures.
We introduce a new class of coherent metamaterials where regular ensembles of meta-molecules show collective, coherent narrow-band response leading to unusual electromagnetic properties and potential applications in the lasing spaser.
We report that small chiral asymmetry of the unit cell of planar metamaterials leads to strong resonant asymmetric transmission for circularly polarized light due to excitation of enantiomerically sensitive trapped modes.
Summary form only given. We discuss a means of achieving a large optical nonlinearity in a material on the verge of a transition between structural phases with significantly different optical properties. We have found that films of gallium deposited on fused silica by ultrafast pulsed laser ablation show a fully reversible, surface-assisted metallization when approaching the transition from the /spl...
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