Engineering optical properties of semiconductor metafilm superabsorbers

Soo Jin Kim, Pengyu Fan, Ju Hyung Kang, Mark L. Brongersma

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Light absorption in ultrathin layer of semiconductor has been considerable interests for many years due to its potential applications in various optical devices. In particular, there have been great efforts to engineer the optical properties of the film for the control of absorption spectrums. Whereas the isotropic thin films have intrinsic optical properties that are fixed by materials' properties, metafilm that are composed by deep subwavelength nano-building blocks provides significant flexibilities in controlling the optical properties of the designed effective layers. Here, we present the ultrathin semiconductor metafilm absorbers by arranging germanium (Ge) nanobeams in deep subwavelength scale. Resonant properties of high index semiconductor nanobeams play a key role in designing effective optical properties of the film. We demonstrate this in theory and experimental measurements to build a designing rule of efficient, controllable metafilm absorbers. The proposed strategy of engineering optical properties could open up wide range of applications from ultrathin photodetection and solar energy harvesting to the diverse flexible optoelectronics.

Original languageEnglish
Title of host publicationMetamaterials X
EditorsAllan D. Boardman, Kevin F. MacDonald, Nigel P. Johnson, Ekmel Ozbay
PublisherSPIE
ISBN (Electronic)9781510601284
DOIs
Publication statusPublished - 2016 Jan 1
Externally publishedYes
EventMetamaterials X - Brussels, Belgium
Duration: 2016 Apr 42016 Apr 7

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9883
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceMetamaterials X
CountryBelgium
CityBrussels
Period16/4/416/4/7

Keywords

  • Germanium
  • Light trapping
  • Metafilm
  • Metamaterial
  • Mie resonance
  • Solar energy harvesting

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Kim, S. J., Fan, P., Kang, J. H., & Brongersma, M. L. (2016). Engineering optical properties of semiconductor metafilm superabsorbers. In A. D. Boardman, K. F. MacDonald, N. P. Johnson, & E. Ozbay (Eds.), Metamaterials X [98830Y] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9883). SPIE. https://doi.org/10.1117/12.2231164