Enhanced reflection from inverse tapered nanocone arrays

Xiang-tian Kong, Haider Butt, Ali K. Yetisen, Chuan Kangwanwatana, Yunuen Montelongo, Sunan Deng, Fernando Da Cruz Vasconcellos, Malik M. Qasim, Timothy D. Wilkinson, Qing Dai

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Abstract

We computationally and experimentally demonstrate enhanced reflection effects displayed by silicon-based inverted nanocone arrays. A 3D finite element model is used to characterize the optical properties of the nanocone arrays with respect to the change in polarization and incident angles. The nanocone arrays are fabricated by e-beam lithography in hexagonal and triangular geometries with a lattice constant of 300 nm. The fabricated devices show a two-fold increase in reflection compared with bare silicon surface, as well as a strong diffraction within the visible and near-infrared spectra. The nanocone arrays may find a variety of applications from optical devices to energy conservation technologies.
Original languageEnglish
Article number053108
JournalApplied Physics Letters
Volume105
Issue number5
DOIs
Publication statusPublished - 4 Aug 2014

Keywords

  • Silicon
  • Light diffraction
  • Nanostructures
  • Polarization
  • Reflectivity

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