TY  - SER
AU  - Kirienko,Victor V.
AU  - Bloshkin,Aleksei A.
AU  - Dvurechenskii,Anatolii V.
AU  - Utkin,Dmitrii E.
AU  - Yakimov,Andrew I.
TI  - Quantum dot based mid-infrared photodetector enhanced by a hybrid metal-dielectric optical antenna
KW  - квантовые точки
KW  - фотодетектирование в инфракрасном диапазоне
KW  - поверхностные плазмоны
KW  - усиление ближнего поля
KW  - статьи в журналах
N1  - Библиогр.: 59 назв
N2  - 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
UR  - http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000794386
ER  -