19 August 2010 Cladding index engineering of the photonic properties of single-mode photonic crystal devices
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Abstract
In an effort to engineer photonic crystal slab (PCS) devices that operate within a single slab-mode regime, the effect of increased cladding index was studied using FDTD simulation. It is known that while increased cladding index forces the light-cone to constrict in frequency, the single mode condition eases allowing for the use of thicker slabs that remain single-mode. This study shows that the behavior of the photonic band gap is similar to that of the light-cone, sweeping lower in frequency, and even widening in some cases, as cladding index increases. Band gap behavior for both even and odd polarizations over thicknesses from d/a = 0.2 to 0.6 and cladding indices from 1 to 2.5 were studied in efforts to design a single-mode, polarization insensitive, complete band gap. When graphically overlaid, the light-cone, single-mode condition, and transmission spectra represent an enabling reference for the design of realizable structures. For device applications where modal dispersion is detrimental or single mode operation is necessary, a paradigm shift away from air-bridge devices is shown to be essential as single-mode structures of this type demand slab thicknesses far too thin for adequate band gap engineering.
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M. D. Weed, H. P. Seigneur, W. V. Schoenfeld, "Cladding index engineering of the photonic properties of single-mode photonic crystal devices", Proc. SPIE 7764, Nanoengineering: Fabrication, Properties, Optics, and Devices VII, 776403 (19 August 2010); doi: 10.1117/12.860267; https://doi.org/10.1117/12.860267
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