Gain assisted nanocomposite multilayers with near zero permittivity modulus at visible frequencies
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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 epsilon(parallel to) attain very small values and we measure, at lambda = 604 nm, vertical bar epsilon(parallel to)vertical bar = 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.
Rizza , C , Di Falco , A & Ciattoni , A 2011 , ' Gain assisted nanocomposite multilayers with near zero permittivity modulus at visible frequencies ' Applied Physics Letters , vol 99 , no. 22 , 221107 . DOI: 10.1063/1.3665414
Applied Physics Letters
Copyright 2011, American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters, Vol 99, Issue 22, and may be found at: http://scitation.aip.org/content/aip/journal/apl/99/22/10.1063/1.3665414
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