Quantum dot based mid-infrared photodetector enhanced by a hybrid metal-dielectric optical antenna A. I. Yakimov, V. V. Kirienko, A. A. Bloshkin [et al.]
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ArticleContent type: Текст Media type: электронный Subject(s): квантовые точки | фотодетектирование в инфракрасном диапазоне | поверхностные плазмоны | усиление ближнего поляGenre/Form: статьи в журналах Online resources: Click here to access online
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Journal of physics D: Applied physics Vol. 53, № 33. P. 335105 (1-7)Abstract: Surface plasmon waves and Rayleigh anomaly are characteristic optical phenomena exhibited
by periodic subwavelength grating structures. In this paper, a hybrid metal-dielectric
metasurface is proposed to improve the photoresponse of Ge/Si quantum dot infrared
photodetectors (QDIPs) with limited absorption layer thickness. The composite metasurface
consists of a regular array of silicon pillars. The pillars protrude through subwavelength holes in
a perforated gold film on the detector top. We demonstrate that by combining effects of
dielectric and plasmonic metal components, the QDIP photoresponse can be significantly
improved compared to case when all-dielectric and metal gratings work alone. We observe
about four times photoresponse enhancement with the hybrid metasurface device relative to a
common plasmonic design with a two-dimensional metal hole array. Compared with a bare
QDIP, the peak responsivity of the hybrid detector at a wavelength of 4.4 μm is increased by a
factor of 15. The enhanced sensitivity is supposed to arise from coupling of the surface plasmon
resonance and diffractive effect related to the Rayleigh anomaly.
Библиогр.: 59 назв.
Surface plasmon waves and Rayleigh anomaly are characteristic optical phenomena exhibited
by periodic subwavelength grating structures. In this paper, a hybrid metal-dielectric
metasurface is proposed to improve the photoresponse of Ge/Si quantum dot infrared
photodetectors (QDIPs) with limited absorption layer thickness. The composite metasurface
consists of a regular array of silicon pillars. The pillars protrude through subwavelength holes in
a perforated gold film on the detector top. We demonstrate that by combining effects of
dielectric and plasmonic metal components, the QDIP photoresponse can be significantly
improved compared to case when all-dielectric and metal gratings work alone. We observe
about four times photoresponse enhancement with the hybrid metasurface device relative to a
common plasmonic design with a two-dimensional metal hole array. Compared with a bare
QDIP, the peak responsivity of the hybrid detector at a wavelength of 4.4 μm is increased by a
factor of 15. The enhanced sensitivity is supposed to arise from coupling of the surface plasmon
resonance and diffractive effect related to the Rayleigh anomaly.
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