Optics of multiple grooves in metal

Transition from high scattering to strong absorption

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Resumé

This paper studies theoretically how the optics of multiple grooves in a metal change as the number of grooves is increased gradually from a single groove to innitely many arranged in a periodic array. In the case of a single groove the out-of-plane scattering (OUP) cross section at resonance can signicantly exceed the groove width. On the other hand a periodic array of identical grooves behaves radically dierent and is a near-perfect absorber at the same wavelength. When illuminating multiple grooves with a plane wave the OUP cross section is found to scale roughly linearly with the number of grooves and is comparable to the physical array width even for widths of many wavelengths. The normalized OUP cross section per groove even exceeds that of a single
groove, which is explained as a consequence of surface plasmon polaritons generated at one groove being scattered out-of-the-plane by other grooves. In the case of illuminating instead with a Gaussian beam, and observing the limit as the incident beam narrows and is conned within the multiple-groove array, it is found that the total reflectance becomes very low and that there is practically no out-of-plane scattering. The well-known result for periodic arrays is thus recovered. All calculations were carried out using Greens function surface integral equation methods taking advantage of the periodic nature of the structures. Both rectangular and tapered grooves are considered.
OriginalsprogEngelsk
TitelPlasmonics : Design, Materials, Fabrication, Characterization, and Applications XV
Antal sider12
ForlagSPIE - International Society for Optical Engineering
Publikationsdato25 aug. 2017
Sider1-12
ISBN (Trykt)9781510611498
ISBN (Elektronisk)9781510611504
DOI
StatusUdgivet - 25 aug. 2017
BegivenhedSPIE NANOSCIENCE + ENGINEERING - San Diego, USA
Varighed: 6 aug. 201710 aug. 2017

Konference

KonferenceSPIE NANOSCIENCE + ENGINEERING
LandUSA
BySan Diego
Periode06/08/201710/08/2017
NavnProceedings of SPIE, the International Society for Optical Engineering
Vol/bind10346
ISSN0277-786X

Emneord

  • Surface plasmons
  • diffraction and gratings
  • scattering theory
  • metal optics

Citer dette

Skjølstrup, E. J. H., Søndergaard, T., Pedersen, K., & Pedersen, T. G. (2017). Optics of multiple grooves in metal: Transition from high scattering to strong absorption. I Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV (s. 1-12). SPIE - International Society for Optical Engineering. Proceedings of SPIE, the International Society for Optical Engineering, Bind. 10346 https://doi.org/10.1117/12.2273972
Skjølstrup, Enok Johannes Haahr ; Søndergaard, Thomas ; Pedersen, Kjeld ; Pedersen, Thomas Garm. / Optics of multiple grooves in metal : Transition from high scattering to strong absorption. Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV. SPIE - International Society for Optical Engineering, 2017. s. 1-12 (Proceedings of SPIE, the International Society for Optical Engineering, Bind 10346).
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title = "Optics of multiple grooves in metal: Transition from high scattering to strong absorption",
abstract = "This paper studies theoretically how the optics of multiple grooves in a metal change as the number of grooves is increased gradually from a single groove to innitely many arranged in a periodic array. In the case of a single groove the out-of-plane scattering (OUP) cross section at resonance can signicantly exceed the groove width. On the other hand a periodic array of identical grooves behaves radically dierent and is a near-perfect absorber at the same wavelength. When illuminating multiple grooves with a plane wave the OUP cross section is found to scale roughly linearly with the number of grooves and is comparable to the physical array width even for widths of many wavelengths. The normalized OUP cross section per groove even exceeds that of a singlegroove, which is explained as a consequence of surface plasmon polaritons generated at one groove being scattered out-of-the-plane by other grooves. In the case of illuminating instead with a Gaussian beam, and observing the limit as the incident beam narrows and is conned within the multiple-groove array, it is found that the total reflectance becomes very low and that there is practically no out-of-plane scattering. The well-known result for periodic arrays is thus recovered. All calculations were carried out using Greens function surface integral equation methods taking advantage of the periodic nature of the structures. Both rectangular and tapered grooves are considered.",
keywords = "Surface plasmons, diffraction and gratings, scattering theory, metal optics",
author = "Skj{\o}lstrup, {Enok Johannes Haahr} and Thomas S{\o}ndergaard and Kjeld Pedersen and Pedersen, {Thomas Garm}",
year = "2017",
month = "8",
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Skjølstrup, EJH, Søndergaard, T, Pedersen, K & Pedersen, TG 2017, Optics of multiple grooves in metal: Transition from high scattering to strong absorption. i Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV. SPIE - International Society for Optical Engineering, Proceedings of SPIE, the International Society for Optical Engineering, bind 10346, s. 1-12, San Diego, USA, 06/08/2017. https://doi.org/10.1117/12.2273972

Optics of multiple grooves in metal : Transition from high scattering to strong absorption. / Skjølstrup, Enok Johannes Haahr; Søndergaard, Thomas; Pedersen, Kjeld; Pedersen, Thomas Garm.

Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV. SPIE - International Society for Optical Engineering, 2017. s. 1-12 (Proceedings of SPIE, the International Society for Optical Engineering, Bind 10346).

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

TY - GEN

T1 - Optics of multiple grooves in metal

T2 - Transition from high scattering to strong absorption

AU - Skjølstrup, Enok Johannes Haahr

AU - Søndergaard, Thomas

AU - Pedersen, Kjeld

AU - Pedersen, Thomas Garm

PY - 2017/8/25

Y1 - 2017/8/25

N2 - This paper studies theoretically how the optics of multiple grooves in a metal change as the number of grooves is increased gradually from a single groove to innitely many arranged in a periodic array. In the case of a single groove the out-of-plane scattering (OUP) cross section at resonance can signicantly exceed the groove width. On the other hand a periodic array of identical grooves behaves radically dierent and is a near-perfect absorber at the same wavelength. When illuminating multiple grooves with a plane wave the OUP cross section is found to scale roughly linearly with the number of grooves and is comparable to the physical array width even for widths of many wavelengths. The normalized OUP cross section per groove even exceeds that of a singlegroove, which is explained as a consequence of surface plasmon polaritons generated at one groove being scattered out-of-the-plane by other grooves. In the case of illuminating instead with a Gaussian beam, and observing the limit as the incident beam narrows and is conned within the multiple-groove array, it is found that the total reflectance becomes very low and that there is practically no out-of-plane scattering. The well-known result for periodic arrays is thus recovered. All calculations were carried out using Greens function surface integral equation methods taking advantage of the periodic nature of the structures. Both rectangular and tapered grooves are considered.

AB - This paper studies theoretically how the optics of multiple grooves in a metal change as the number of grooves is increased gradually from a single groove to innitely many arranged in a periodic array. In the case of a single groove the out-of-plane scattering (OUP) cross section at resonance can signicantly exceed the groove width. On the other hand a periodic array of identical grooves behaves radically dierent and is a near-perfect absorber at the same wavelength. When illuminating multiple grooves with a plane wave the OUP cross section is found to scale roughly linearly with the number of grooves and is comparable to the physical array width even for widths of many wavelengths. The normalized OUP cross section per groove even exceeds that of a singlegroove, which is explained as a consequence of surface plasmon polaritons generated at one groove being scattered out-of-the-plane by other grooves. In the case of illuminating instead with a Gaussian beam, and observing the limit as the incident beam narrows and is conned within the multiple-groove array, it is found that the total reflectance becomes very low and that there is practically no out-of-plane scattering. The well-known result for periodic arrays is thus recovered. All calculations were carried out using Greens function surface integral equation methods taking advantage of the periodic nature of the structures. Both rectangular and tapered grooves are considered.

KW - Surface plasmons

KW - diffraction and gratings

KW - scattering theory

KW - metal optics

U2 - 10.1117/12.2273972

DO - 10.1117/12.2273972

M3 - Article in proceeding

SN - 9781510611498

SP - 1

EP - 12

BT - Plasmonics

PB - SPIE - International Society for Optical Engineering

ER -

Skjølstrup EJH, Søndergaard T, Pedersen K, Pedersen TG. Optics of multiple grooves in metal: Transition from high scattering to strong absorption. I Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV. SPIE - International Society for Optical Engineering. 2017. s. 1-12. (Proceedings of SPIE, the International Society for Optical Engineering, Bind 10346). https://doi.org/10.1117/12.2273972