局域表面等离子体增强锗的光电响应特性

doi:10.12066/j.issn.1007-2861.1816

Abstract

Abstract:

Local surface plasmon resonance (LSPR) is attracting much attention in nano-optoelectronics because of the unique photo response. Ge is an essential microelectronic material. But its photoelectric response is weak in the near-infrared region. Combination of the local surface plasmon and Ge can improve photoelectric response of Ge. The local surface plasmon resonance properties in Ge consisting of one, two and three silver nanoparticles cluster embedded in the Ge bulk are investigated using a finite difference time domain (FDTD) method. The extinction cross sections of one, two, and three silver nanoparticles are discussed in detail. The results show that the composite structure can effectively enhance extinction of Ge in a wide-range from visible to near-infrared. Moreover, the clusters show new types of photo responses as compared with single silver nanoparticle. The results also suggest that photo responses determined by local surface plasmon resonance depend strongly on conditions such as polarization directions of incident light, number of particles, size of single particle, and gap distances. This study is of significance for Ge applications and utilization of local surface plasmon resonance in optoelectronics.

Key words: optoelectronics, local surface plasmon resonance (LSPR), finite difference time domain (FDTD) method, silver nanoparticle, extinction cross section

CLC Number:

O436.2

QI Gongmin, DI Zengfeng, REN Wei. Photoelectric-response enhancement of local surface plasmon in Ge[J]. Journal of Shanghai University（Natural Science Edition）, 2018, 24(2): 207-216.

Figures/Tables 7

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References 33

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Photoelectric-response enhancement of local surface plasmon in Ge

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