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Nanometer-thick Au-films as antireflection coating for infrared light

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Abstract

The optical properties of ultrathin Au films on silicon have been studied in the infrared over a wide frequency range from 200 to 10,000cm1. Thick films show a Drude behavior; i.e., with increasing frequency the transmission increases; for films below the percolation threshold at about 5nm a negative slope for the frequency-dependent transmission is observed. When the thickness is further reduced, between 1 and 3nm an anomaly occurs: the relative transmission reaches maximum values above 100% compared with the bare substrate, indicating an antireflection coating of nanometer thickness for light of 5μm wavelength. This anomaly can be explained in the framework of effective-medium theories.

© 2007 Optical Society of America

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