Creating semiconductor metafilms with designer absorption spectra

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

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The optical properties of semiconductors are typically considered intrinsic and fixed. Here we leverage the rapid developments in the field of optical metamaterials to create ultrathin semiconductor metafilms with designer absorption spectra. We show how such metafilms can be constructed by placing one or more types of high-index semiconductor antennas into a dense array with subwavelength spacings. It is argued that the large absorption cross-section of semiconductor antennas and their weak near-field coupling open a unique opportunity to create strongly absorbing metafilms whose spectral absorption properties directly reflect those of the individual antennas. Using experiments and simulations, we demonstrate that near-unity absorption at one or more target wavelengths of interest can be achieved in a sub-50-nm-thick metafilm using judiciously sized and spaced Ge nanobeams. The ability to create semiconductor metafilms with custom absorption spectra opens up new design strategies for planar optoelectronic devices and solar cells.

Original languageEnglish
Article number7591
JournalNature communications
Volume6
DOIs
Publication statusPublished - 2015 Jul 17
Externally publishedYes

Fingerprint

Semiconductors
Absorption spectra
Semiconductor materials
absorption spectra
antennas
Antennas
Metamaterials
optoelectronic devices
Optoelectronic devices
absorption cross sections
unity
near fields
Solar cells
Optical properties
solar cells
spacing
optical properties
Equipment and Supplies
Wavelength
cells

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Creating semiconductor metafilms with designer absorption spectra. / Kim, Soo Jin; Fan, Pengyu; Kang, Ju Hyung; Brongersma, Mark L.

In: Nature communications, Vol. 6, 7591, 17.07.2015.

Research output: Contribution to journalArticle

Kim, Soo Jin ; Fan, Pengyu ; Kang, Ju Hyung ; Brongersma, Mark L. / Creating semiconductor metafilms with designer absorption spectra. In: Nature communications. 2015 ; Vol. 6.
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