Journal
OPTICS LETTERS
Volume 32, Issue 11, Pages 1578-1580Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.32.001578
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The optical properties of ultrathin Au films on silicon have been studied in the infrared over a wide frequency range from 200 to 10,000 cm(-1). Thick films show a Drude behavior; i.e., with increasing frequency the transmission increases; for films below the percolation threshold at about 5 nm a negative slope for the frequency-dependent transmission is observed. When the thickness is further reduced, between 1 and 3 nm an anomaly occurs: the relative transmission reaches maximum values above 100% compared with the bare substrate, indicating an antirefiection coating of nanometer thickness for light of 5 I-Lm wavelength. This anomaly can be explained in the framework of effective-medium theories. (C) 2007 Optical Society of America
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