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Optical transmission through double-layer metallic subwavelength slit arrays
H B Chan1, Z Marcet, Kwangje Woo
1Department of Physics, University of Florida, Gainesville, Florida 32611, USA. hochan@phys.ufl.edu
Optics Letters
|February 25, 2006
Summary
We studied infrared radiation transmission through double-layer metallic gratings. Surprisingly large transmission occurred even without direct alignment, due to coupled evanescent fields.
Area of Science:
- Optics and Photonics
- Metamaterials
- Nanophotonics
Background:
- Metallic gratings with subwavelength slits exhibit unique optical properties.
- Coupling between adjacent metallic nanostructures can lead to enhanced optical phenomena.
- Understanding near-field coupling is crucial for designing advanced optical devices.
Purpose of the Study:
- To investigate infrared radiation transmission through double-layer metallic gratings.
- To explore the effect of lateral shifts between grating layers on transmission.
- To understand the underlying physics of enhanced transmission in such structures.
Main Methods:
- Fabrication of double-layer metallic grating structures.
- Experimental measurement of infrared radiation transmission.
- Numerical simulations using rigorous coupled wave analysis (RCWA).
Main Results:
- Observed surprisingly large transmission at specific wavelengths.
- Demonstrated strong dependence of peak transmission on the lateral shift between layers.
- Showed significant transmission even when no direct line of sight exists.
Conclusions:
- Evanescent field coupling between adjacent metallic layers significantly enhances infrared transmission.
- Lateral shifts play a critical role in tuning the transmission properties.
- RCWA simulations accurately explain the observed phenomena, providing insights for device design.
