Mid-infrared optical resonances in quantum dot photodetectors coupled with metallic gratings with different aperture diameters A. I. Yakimov, V. V. Kirienko, A. A. Bloshkin [et al.]
Material type:
ArticleContent type: Текст Media type: электронный Subject(s): детекторы | инфракрасный диапазон | поверхностные плазмоны | квантовые точки | субволновые структурыGenre/Form: статьи в журналах Online resources: Click here to access online
In:
Current applied physics Vol. 20, № 7. P. 877-882Abstract: The paper is devoted to optical testing of mid-infrared Ge/Si photodetectors obtained by stacking of self-assembled
Ge quantum dots in multilayer structures, which are near-field coupled to the adjacent nanoplasmonic
arrays of subwavelength holes in metallic films. It is shown that photocurrent and near-field spectra consist of
several sets of peaks, which are attributted to surface plasmon waves, localized surface plasmon modes or diffractive
Rayleigh anomaly depending on the hole diameter and the angle of incidence θ. We find that for small
holes the greatest contribution to the photocurrent enhancement is due to the excitation of the surface plasmonpolariton
waves for all θ. As the hole diameter is increased and becomes comparable with the array periodicity,
the normal-incident photoresponse improvement is provided by the Rayleigh anomaly. With the increase of
incident angle, the photocurrent enhancement is supposed to arise from coupling of the localized shape resonance
and propagating plasmon modes.
Библиогр.: 39 назв.
The paper is devoted to optical testing of mid-infrared Ge/Si photodetectors obtained by stacking of self-assembled
Ge quantum dots in multilayer structures, which are near-field coupled to the adjacent nanoplasmonic
arrays of subwavelength holes in metallic films. It is shown that photocurrent and near-field spectra consist of
several sets of peaks, which are attributted to surface plasmon waves, localized surface plasmon modes or diffractive
Rayleigh anomaly depending on the hole diameter and the angle of incidence θ. We find that for small
holes the greatest contribution to the photocurrent enhancement is due to the excitation of the surface plasmonpolariton
waves for all θ. As the hole diameter is increased and becomes comparable with the array periodicity,
the normal-incident photoresponse improvement is provided by the Rayleigh anomaly. With the increase of
incident angle, the photocurrent enhancement is supposed to arise from coupling of the localized shape resonance
and propagating plasmon modes.
There are no comments on this title.