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Title: Creating semiconductor metafilms with designer absorption spectra

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

Authors:
 [1];  [1];  [1];  [1]
  1. Geballe Lab for Advanced Materials, Stanford, CA (United States)
Publication Date:
Research Org.:
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1459205
Grant/Contract Number:  
SC0001293
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Kim, Soo Jin, Fan, Pengyu, Kang, Ju -Hyung, and Brongersma, Mark L. Creating semiconductor metafilms with designer absorption spectra. United States: N. p., 2015. Web. doi:10.1038/ncomms8591.
Kim, Soo Jin, Fan, Pengyu, Kang, Ju -Hyung, & Brongersma, Mark L. Creating semiconductor metafilms with designer absorption spectra. United States. doi:10.1038/ncomms8591.
Kim, Soo Jin, Fan, Pengyu, Kang, Ju -Hyung, and Brongersma, Mark L. Fri . "Creating semiconductor metafilms with designer absorption spectra". United States. doi:10.1038/ncomms8591. https://www.osti.gov/servlets/purl/1459205.
@article{osti_1459205,
title = {Creating semiconductor metafilms with designer absorption spectra},
author = {Kim, Soo Jin and Fan, Pengyu and Kang, Ju -Hyung and Brongersma, Mark L.},
abstractNote = {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.},
doi = {10.1038/ncomms8591},
journal = {Nature Communications},
number = 1,
volume = 6,
place = {United States},
year = {Fri Jul 17 00:00:00 EDT 2015},
month = {Fri Jul 17 00:00:00 EDT 2015}
}

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Cited by: 20 works
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Works referenced in this record:

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