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Gain assisted nanocomposite multilayers with near zero permittivity modulus at visible frequencies

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3 Author(s)
Rizza, Carlo ; Dipartimento di Fisica e Matematica, Universitá dell’Insubria, Via Valleggio 11, 22100 Como, Italy ; Di Falco, Andrea ; Ciattoni, Alessandro

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We have fabricated a nano-laminate by alternating metal and gain medium layers, the gain dielectric consisting of a polymer incorporating optically pumped dye molecules. From standard reflection-transmission experiments, we show that, at a visible wavelength, both the real and the imaginary parts of the permittivity ε|| attain very small values and we measure, at λ = 604 nm,

ε||
=0.04
which is 21.5% smaller than its value in the absence of optical pumping. Our investigation thus proves that a medium with a permittivity with very small modulus, a key condition promising efficient subwavelength optical steering, can be actually synthesized.

Published in:

Applied Physics Letters  (Volume:99 ,  Issue: 22 )