Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 31, Issue 6, Pages A13-A19Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.31.000A13
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- U.S. Army Aviation and Missile Research Development and Engineering Center
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We use a quantum mechanical approach to derive a set of linear and nonlinear quantum conductivity coefficients for metal-insulator-metal structures with nanometer sized gaps. The immediate proximity of metallic objects generates a tunneling AC current density that endows the gap region with additional linear and nonlinear coefficients that in turn trigger linear and nonlinear absorption, and second-and third-harmonic generation. For example, a vacuum gap approximately 0.8 nm thick displays an effective vertical bar chi((2))vertical bar similar to 0.1 pm/V for adjacent objects composed of dissimilar metals and an effective vertical bar chi((3))vertical bar similar to 10(-20) m(2)/V-2 for either similar or dissimilar metals, increasing exponentially for smaller gaps. Field localization inside the gap ensures that harmonic generation arising from the gap region overwhelms intrinsic metal second-and third-order nonlinearities. (C) 2014 Optical Society of America
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