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Absorption-induced scattering and surface plasmon out-coupling from absorber-coated plasmonic metasurfaces.

Petoukhoff CE, O'Carroll DM - Nat Commun (2015)

Bottom Line: Here we identify three distinct mode types of absorber-coated plasmonic metasurfaces: localized and propagating surface plasmons and a previously unidentified optical mode type called absorption-induced scattering.Furthermore, we show that surface plasmons are backscattered when the crystallinity of the absorber is low but are absorbed for more crystalline absorber coatings.This work furthers our understanding of light-matter interactions between absorbers and surface plasmons to enable practical optoelectronic applications of metasurfaces.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, New Jersey 08854, USA.

ABSTRACT
Interactions between absorbers and plasmonic metasurfaces can give rise to unique optical properties not present for either of the individual materials and can influence the performance of a host of optical sensing and thin-film optoelectronic applications. Here we identify three distinct mode types of absorber-coated plasmonic metasurfaces: localized and propagating surface plasmons and a previously unidentified optical mode type called absorption-induced scattering. The extinction of the latter mode type can be tuned by controlling the morphology of the absorber coating and the spectral overlap of the absorber with the plasmonic modes. Furthermore, we show that surface plasmons are backscattered when the crystallinity of the absorber is low but are absorbed for more crystalline absorber coatings. This work furthers our understanding of light-matter interactions between absorbers and surface plasmons to enable practical optoelectronic applications of metasurfaces.

No MeSH data available.


Scattering modes supported by absorber-coated plasmonic metasurfaces.(a) The organic semiconductor-coated planar Ag film has been shown to only support Mie-AIS for organic coatings exhibiting high degrees of nanoscale surface features. (b,c) The organic semiconductor-coated AgNPA/Ag metasurfaces have been shown to support various LSPR, plasmon–AIS and SPP modes. While the LSPR and plasmon–AIS modes backscatter for all absorber coatings, the SPP mode was trapped for semicrystalline organic absorber coatings (b) and was only scattered to the far field for the amorphous organic absorber-coated metasurfaces (c).
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f8: Scattering modes supported by absorber-coated plasmonic metasurfaces.(a) The organic semiconductor-coated planar Ag film has been shown to only support Mie-AIS for organic coatings exhibiting high degrees of nanoscale surface features. (b,c) The organic semiconductor-coated AgNPA/Ag metasurfaces have been shown to support various LSPR, plasmon–AIS and SPP modes. While the LSPR and plasmon–AIS modes backscatter for all absorber coatings, the SPP mode was trapped for semicrystalline organic absorber coatings (b) and was only scattered to the far field for the amorphous organic absorber-coated metasurfaces (c).

Mentions: Several conclusions can be drawn from the results of the scattered-light spectroscopy, electromagnetic simulations, surface morphology and crystallinity studies for the various organic semiconductor absorber coatings and are schematically represented in Fig. 8a–c. For absorber coatings on planar Ag, nanoscale surface features in the coating resulted in Mie-AIS occurring at wavelengths just red-shifted from the absorption edge of the coating. This may be of interest for improved light trapping in photovoltaic applications—in cases where nanoscale surface roughness does not degrade other performance parameters of a device, it may be beneficial to incorporate some degree of roughness in thin-film absorber layers to help scatter sub-bandgap light where absorption is weakest.


Absorption-induced scattering and surface plasmon out-coupling from absorber-coated plasmonic metasurfaces.

Petoukhoff CE, O'Carroll DM - Nat Commun (2015)

Scattering modes supported by absorber-coated plasmonic metasurfaces.(a) The organic semiconductor-coated planar Ag film has been shown to only support Mie-AIS for organic coatings exhibiting high degrees of nanoscale surface features. (b,c) The organic semiconductor-coated AgNPA/Ag metasurfaces have been shown to support various LSPR, plasmon–AIS and SPP modes. While the LSPR and plasmon–AIS modes backscatter for all absorber coatings, the SPP mode was trapped for semicrystalline organic absorber coatings (b) and was only scattered to the far field for the amorphous organic absorber-coated metasurfaces (c).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4557133&req=5

f8: Scattering modes supported by absorber-coated plasmonic metasurfaces.(a) The organic semiconductor-coated planar Ag film has been shown to only support Mie-AIS for organic coatings exhibiting high degrees of nanoscale surface features. (b,c) The organic semiconductor-coated AgNPA/Ag metasurfaces have been shown to support various LSPR, plasmon–AIS and SPP modes. While the LSPR and plasmon–AIS modes backscatter for all absorber coatings, the SPP mode was trapped for semicrystalline organic absorber coatings (b) and was only scattered to the far field for the amorphous organic absorber-coated metasurfaces (c).
Mentions: Several conclusions can be drawn from the results of the scattered-light spectroscopy, electromagnetic simulations, surface morphology and crystallinity studies for the various organic semiconductor absorber coatings and are schematically represented in Fig. 8a–c. For absorber coatings on planar Ag, nanoscale surface features in the coating resulted in Mie-AIS occurring at wavelengths just red-shifted from the absorption edge of the coating. This may be of interest for improved light trapping in photovoltaic applications—in cases where nanoscale surface roughness does not degrade other performance parameters of a device, it may be beneficial to incorporate some degree of roughness in thin-film absorber layers to help scatter sub-bandgap light where absorption is weakest.

Bottom Line: Here we identify three distinct mode types of absorber-coated plasmonic metasurfaces: localized and propagating surface plasmons and a previously unidentified optical mode type called absorption-induced scattering.Furthermore, we show that surface plasmons are backscattered when the crystallinity of the absorber is low but are absorbed for more crystalline absorber coatings.This work furthers our understanding of light-matter interactions between absorbers and surface plasmons to enable practical optoelectronic applications of metasurfaces.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, New Jersey 08854, USA.

ABSTRACT
Interactions between absorbers and plasmonic metasurfaces can give rise to unique optical properties not present for either of the individual materials and can influence the performance of a host of optical sensing and thin-film optoelectronic applications. Here we identify three distinct mode types of absorber-coated plasmonic metasurfaces: localized and propagating surface plasmons and a previously unidentified optical mode type called absorption-induced scattering. The extinction of the latter mode type can be tuned by controlling the morphology of the absorber coating and the spectral overlap of the absorber with the plasmonic modes. Furthermore, we show that surface plasmons are backscattered when the crystallinity of the absorber is low but are absorbed for more crystalline absorber coatings. This work furthers our understanding of light-matter interactions between absorbers and surface plasmons to enable practical optoelectronic applications of metasurfaces.

No MeSH data available.