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Creating semiconductor metafilms with designer absorption spectra

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms8591· OSTI ID:1459205
 [1];  [2];  [2];  [2]
  1. Geballe Lab for Advanced Materials, Stanford, CA (United States); California Institute of Technology
  2. Geballe Lab for Advanced Materials, Stanford, CA (United States)

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. Furthermore, the ability to create semiconductor metafilms with custom absorption spectra opens up new design strategies for planar optoelectronic devices and solar cells.

Research Organization:
California Inst. of Technology (CalTech), Pasadena, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Light-Material Interactions in Energy Conversion (LMI)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0001293
OSTI ID:
1459205
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 6; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Planar Metasurfaces Enable High-Efficiency Colored Perovskite Solar Cells journal August 2018
Anti-Hermitian photodetector facilitating efficient subwavelength photon sorting journal January 2018
Deep-subwavelength control of acoustic waves in an ultra-compact metasurface lens journal November 2018
Ultrahigh omnidirectional, broadband, and polarization-independent optical absorption over the visible wavelengths by effective dispersion engineering journal July 2019
Omnidirectional and broadband absorption enhancement from trapezoidal Mie resonators in semiconductor metasurfaces journal September 2016
Light Concentration by Metal-Dielectric Micro-Resonators for SERS Sensing journal December 2018
Water-Resonator-Based Metasurface: An Ultrabroadband and Near-Unity Absorption journal March 2017
Broadband Metamaterial Absorbers journal October 2018
Numerical Study of the Wide-angle Polarization-Independent Ultra-Broadband Efficient Selective Solar Absorber in the Entire Solar Spectrum journal June 2017
All-dielectric metamaterials journal January 2016
Up Scalable Full Colour Plasmonic Pixels with Controllable Hue, Brightness and Saturation journal April 2017
Numerical study of a wide-angle polarization-independent ultra-broadband efficient selective metamaterial absorber for near-ideal solar thermal energy conversion journal January 2018
All-dielectric phase-change reconfigurable metasurface journal August 2016
Metamaterials absorber based on doped semiconductor for THz and FIR frequency ranges journal February 2019
Photonic spin-controlled multifunctional shared-aperture antenna array conference October 2016
Photonic spin-controlled multifunctional shared-aperture antenna array journal April 2016
Optically resonant dielectric nanostructures journal November 2016
Compositionally controlled plasmonics in amorphous semiconductor metasurfaces journal January 2018
Colorimetric detection of ultrathin dielectrics on strong interference coatings journal January 2018

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