Citeable URL: https://ir.library.oregonstate.edu/concern/articles/8336h377f

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Attribute Name	Values
Creator	Han, Katherine Chang, Chih-Hung
Abstract	This paper reviews the current progress in mathematical modeling of anti-reflective subwavelength structures. Methods covered include effective medium theory (EMT), finite-difference time-domain (FDTD), transfer matrix method (TMM), the Fourier modal method (FMM)/rigorous coupled-wave analysis (RCWA) and the finite element method (FEM). Time-based solutions to Maxwell’s equations, such as FDTD, have the benefits of calculating reflectance for multiple wavelengths of light per simulation, but are computationally intensive. Space-discretized methods such as FDTD and FEM output field strength results over the whole geometry and are capable of modeling arbitrary shapes. Frequency-based solutions such as RCWA/FMM and FEM model one wavelength per simulation and are thus able to handle dispersion for regular geometries. Analytical approaches such as TMM are appropriate for very simple thin films. Initial disadvantages such as neglect of dispersion (FDTD), inaccuracy in TM polarization (RCWA), inability to model aperiodic gratings (RCWA), and inaccuracy with metallic materials (FDTD) have been overcome by most modern software. All rigorous numerical methods have accurately predicted the broadband reflection of ideal, graded-index anti-reflective subwavelength structures; ideal structures are tapered nanostructures with periods smaller than the wavelengths of light of interest and lengths that are at least a large portion of the wavelengths considered.
Resource Type	Article
DOI	10.3390/nano4010087
Date Available	2014-10-15T01:14:18+00:00
Date Issued	2014-03
Citation	Han, K., & Chang, C. (2014). Numerical modeling of sub-wavelength anti-reflective structures for solar module applications. Nanomaterials, 4(1), 87-128. doi:10.3390/nano4010087
Journal Title	Nanomaterials
Series	Nanomaterials Special Issue: Nanomaterials in Energy Conversion and Storage Vol. 4 no. 1
Keyword	Sub-wavelength Optical modeling RCWA Antireflective Effective medium theory FDTD
Rights Statement	In Copyright
Funding Statement (additional comments about funding)	Financial support from National Science Foundation STTR Phase II grant with CSD Nano Inc., Oregon BEST, the Microproducts Breakthrough Institute, Oregon State University College of Engineering, and the Rickert Engineering Fellowship.
Publisher	MDPI AG, Basel, Switzerland
Peer Reviewed	Yes
Language	English [eng]
Replaces	http://hdl.handle.net/1957/52964
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