Wednesday, March 30, 2011

First perovskite-based superlens for the infrared

March 30, 2011

Researchers with Berkeley Lab have fabricated superlenses from materials that are  simpler and easier to fabricate than metamaterials.

The superlenses are ideal for capturing light in the mid-infrared range (for infrared spectroscopy and thermal sensors, for example), says Ramamoorthy Ramesh, a materials scientist with Berkeley Lab’s Materials Sciences Division and colleague S.C. Kehr at the University of Saint Andrews in the UK.

The perovskites used to make the superlens, bismuth ferrite and strontium titan­ate, feature a low rate of photon absorption and can be grown as epitaxial multilayers with a highly crystalline quality that reduces interface roughness so there are few photons lost to scattering.

This combination of low absorption and scattering losses significantly improves the imaging resolution of the superlens.

The combination of near-field infrared microscopy and tunable free-electron laser provides the first detailed study of the spatial and spectral near-field responses of the superlens, using a near-field scattering probe (a metal-coated atomic-force microscope tip with a typical radius of 50 nanometers).

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