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Phys Rev Lett. 2003 Nov 14;91(20):207401. Epub 2003 Nov 11.

Subwavelength resolution in a two-dimensional photonic-crystal-based superlens.

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Department of Physics, Bilkent University, Bilkent, 06533 Ankara, Turkey.

Erratum in

  • Phys Rev Lett. 2008 Sep 19;101(12):129903. Foteinopolou, S [corrected to Foteinopoulou, S].


We experimentally and theoretically demonstrate single-beam negative refraction and superlensing in the valence band of a two-dimensional photonic crystal operating in the microwave regime. By measuring the refracted electromagnetic waves from a slab shaped photonic crystal, we find a refractive index of -1.94 that is very close to the theoretical value of -2.06. A scanning transmission measurement technique is used to measure the spatial power distribution of the focused electromagnetic waves that radiate from a point source. The full width at half maximum of the focused beam is measured to be 0.21 lambda, which is in good agreement with the finite difference time domain method simulations. We also report a subwavelength resolution for the image of two incoherent point sources, which are separated by a distance of lambda/3.

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