Journal
OPTICS COMMUNICATIONS
Volume 314, Issue -, Pages 18-22Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2013.08.060
Keywords
Slot waveguides; Epsilon-near-zero metamaterials; Optical coupling; Optical force
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Funding
- Intelligent Systems Center and the Materials Research Center at Missouri ST
- University of Missouri Interdisciplinary Intercampus Research Program
- University of Missouri Research Board
- Ralph E. Powe Junior Faculty Enhancement Award
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Anomalous optical coupling properties between two silicon wires in a silicon slot waveguide embedded in epsilon-near-zero (ENZ) metamaterials are proposed and demonstrated. The dependences of optical field enhancement in the slot region and transverse optical force on the slot size and the permittivity of surrounding material are studied in details. It is demonstrated that the optical field in the slot region is significantly enhanced due to the giant index contrast at the slot interface between silicon wires and ENZ metamaterials, but the optical mode coupling between silicon wires is greatly reduced so that the transverse optical force is suppressed into almost zero. Moreover, metal-dielectric multilayer structures are designed to realize ENZ metamaterials in the slot region for achieving the electric field enhancement. (C) 2013 Elsevier B.V. All rights reserved.
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