Higher-order incidence transfer matrix method used in three-dimensional photonic crystal coupled-resonator array simulation

Department of Physics and Astronomy , Iowa State University, Ames, Iowa, United States
Optics Letters (Impact Factor: 3.18). 01/2007; 31(23):3498-500. DOI: 10.1364/OL.31.003498
Source: PubMed

ABSTRACT The plane-wave-based transfer matrix method with rational function interpolation and higher-order plane-wave incidence is proposed as an efficient calculation approach to simulate three-dimensional photonic crystal devices. As an example, the dispersion relations and quality factors are calculated for resonant cavity arrays embedded in a woodpile photonic crystal. An interesting ultraslow negative group velocity is observed in this structure.

  • [Show abstract] [Hide abstract]
    ABSTRACT: We carry out a systematic study of tandem solar cells consisting of III-V nanowire arrays on silicon using electromagnetic simulations and device simulations. For four III-V materials, we use optical simulations and detailed balance analysis to optimize the nanowires' structural parameters to maximize the detailed balance efficiency. The results show different trends for materials with band gaps smaller and larger than optimal, due to the different requirements for achieving current matching. A higher than 30% detailed-balance efficiency can be achieved by using 1 μm-tall nanowire arrays with optimal parameters. Sample device simulations are conducted to compare different junction geometries and surface conditions. We find that radial junctions are more robust to the presence of surface recombination.
    Journal of Applied Physics 09/2012; 112(6). DOI:10.1063/1.4754317 · 2.19 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Nanostructure arrays such as nanowire, nanopillar, and nanocone arrays have been proposed to be promising antireflection structures for photovoltaic applications due to their great light trapping ability. In this paper, the optical properties of Si nanopillar and nanocone arrays in visible and infrared region were studied by both theoretical calculations and experiments. The results show that the Mie resonance can be continuously tuned across a wide range of wavelength by varying the diameter of the nanopillars. However, Si nanopillar array with uniform diameter exhibits only discrete resonance mode, thus can't achieve a high broadband absorption. On the other hand, the Mie resonance wavelength in a Si nanocone array can vary continuously as the diameters of the cross sections increase from the apex to the base. Therefore Si nanocone arrays can strongly interact with the incident light in the broadband spectrum and the absorbance by Si nanocone arrays is higher than 95% over the wavelength from 300 to 2000 nm. In addition to the Mie resonance, the broadband optical absorption of Si nanocone arrays is also affected by Wood-Rayleigh anomaly effect and metal impurities introduced in the fabrication process.
    Scientific Reports 01/2015; 5:7810. DOI:10.1038/srep07810 · 5.08 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Optimizing the feature sizes of dielectric nanostructures on the top (ZnS) and bottom (SiO2) surfaces of a 1 mu m thick GaAs solar cell, we obtain a higher efficiency (34.4%) than a similar cell with a state of the art bilayer antireflection coating and a planar mirror (33.2%). The back side nanostructure increases the photocurrent due to enhanced optical path length inside the semiconductor, while the nanostructure on the front side increases the photocurrent due to lower reflectance losses. (C) 2013 AIP Publishing LLC.
    Applied Physics Letters 08/2013; 103(8). DOI:10.1063/1.4819100 · 3.52 Impact Factor

Full-text (2 Sources)

Available from
Jun 2, 2014