We present a novel theoretical approximation for predicting the enhanced optical transmission properties through a periodic array of subwavelength square apertures in perforated metal films. We show that a Fabry-Perot resonance occurs in an effective resonant cavity whose dimensions are determined by the apertures' geometry and the decay lengths of the associated evanescent diffracted modes. This model demonstrates strong agreement to simulated results, and can be used to rapidly and efficiently design aperture arrays with specific transmission properties.
We present an analytical study of resonance properties of square subwavelength apertures at optical and near-IR
frequencies. This approach allows accurate prediction of resonance responses, captures both propagating and
evanescent modes, and can easily be implemented in other analytical techniques. In this approach we avoid
analyzing the detailed behavior of the fields inside the metal walls, but still obtain the effects of the buildup of
charges within those walls. We calculate the dispersion relation and find the cutoff frequency's dependence on
cavity dimensions for a square aperture embedded in a silver film, and support our findings with finite-element
simulations.
Fabricating optoelectronic devices can be extremely costly due to the need for using high end fabrication methods
such as photo lithography. Therefore, the importance of being able to accurately and rapidly prototype an
optoelectronic device cannot be overstated. By using commercially available full wave 3D simulation software
(FW3D), rapid prototyping can be achieved. A complete rapid prototyping process would require a discussion on
simulation as well as fabrication work, however for this paper we will only focus on the simulation aspect which is
rapid optimization. The bulk of our work will be to model and rapidly optimize an optoelectronic device which is
currently of interest to many optoelectronic researchers. This structure is labeled as a frequency selective surface.
By using two widely known numerical methods, we will demonstrate the modeling and simulation aspects needed
for achieving rapid optimization and fully characterizing the optoelectronic performance of this device.
We have developed a method to design multi-junction horizontally-oriented solar cells using single-layer photonic
metamaterials. These metamaterial light harvesting templates are capable of separating white light into discrete
wavelength ranges and trapping it efficiently into different, separately wired cavities. Any number of different
wavelength-tailored charge separation complexes can be fixed to the walls of these tuned cavities. To design the
metamaterials we have developed a coupled wave analysis of 2D periodic metamaterials. Past results with 1D
gratings have shown that this is a very effective method for designing periodic structures and we have generalized
the approach to 2D periodic cavities.
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