Optics of a single ultrasharp groove in metal

Thomas Søndergaard, Sergey I Bozhevolnyi

Publikation: Bidrag til tidsskriftLetterForskningpeer review

Resumé

Optical properties of a single ultrasharp groove of subwavelength width cut in an otherwise flat metal surface are examined theoretically. We calculate optical extinction, scattering, and absorption cross-section spectra for a wide range of groove profiles, establishing several fundamental trends. As grooves are made sharper, amplitudes of oscillations in cross-section spectra and their period decrease, while the absorption level increases, leading eventually to efficient broadband (nonresonant) absorption. Oscillations in scattering spectra are generally more pronounced than those in corresponding absorption spectra. For ultrasharp grooves, oscillations in all spectra can be suppressed by increasing the groove depth. Finally, the level of absorption relative to that of scattering increases as the top groove width decreases, a trend that is analogous to that found when decreasing the size of metal nanoparticles.

OriginalsprogEngelsk
TidsskriftOptics Letters
Vol/bind41
Udgave nummer13
Sider (fra-til)2903-2906
ISSN0146-9592
DOI
StatusUdgivet - 2016

Fingeraftryk

grooves
optics
metals
oscillations
scattering
trends
absorption cross sections
metal surfaces
extinction
broadband
absorption spectra
optical properties
nanoparticles
cross sections
profiles

Citer dette

Søndergaard, Thomas ; Bozhevolnyi, Sergey I. / Optics of a single ultrasharp groove in metal. I: Optics Letters. 2016 ; Bind 41, Nr. 13. s. 2903-2906.
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Optics of a single ultrasharp groove in metal. / Søndergaard, Thomas; Bozhevolnyi, Sergey I.

I: Optics Letters, Bind 41, Nr. 13, 2016, s. 2903-2906.

Publikation: Bidrag til tidsskriftLetterForskningpeer review

TY - JOUR

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AU - Søndergaard, Thomas

AU - Bozhevolnyi, Sergey I

PY - 2016

Y1 - 2016

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AB - Optical properties of a single ultrasharp groove of subwavelength width cut in an otherwise flat metal surface are examined theoretically. We calculate optical extinction, scattering, and absorption cross-section spectra for a wide range of groove profiles, establishing several fundamental trends. As grooves are made sharper, amplitudes of oscillations in cross-section spectra and their period decrease, while the absorption level increases, leading eventually to efficient broadband (nonresonant) absorption. Oscillations in scattering spectra are generally more pronounced than those in corresponding absorption spectra. For ultrasharp grooves, oscillations in all spectra can be suppressed by increasing the groove depth. Finally, the level of absorption relative to that of scattering increases as the top groove width decreases, a trend that is analogous to that found when decreasing the size of metal nanoparticles.

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