收稿日期: 2016-05-17
网络出版日期: 2018-05-07
基金资助
国家自然科学基金资助项目(61475180);国家自然科学基金资助项目(11204340);国家自然科学基金资助项目(1127422);国家重点基础研究发展计划(973 计划)青年科学家计划资助项目(2015CB921600);上海市科委启明星计划资助项目(14QA1402000)
Photoelectric-response enhancement of local surface plasmon in Ge
Received date: 2016-05-17
Online published: 2018-05-07
局域表面等离子体共振 (local surface plasmon resonance, LSPR) 因其对光独特的响应特性而在纳米光电子领域成 为研究的重点. 作为重要的微电子材料, 锗在近红外波段的光电响应较弱, 而把局域表面等离子体应用在锗材料中, 必然会改善 锗的光电响应特性. 利用时域有限差分 (finite difference time domain, FDTD) 法, 详细研究了 1, 2, 3 个银纳米颗粒嵌入锗中的消光光谱. 结果发现, 在可见光以及近红外比较宽的波长范围内, 这种复合结构可以有效增强锗的光电响应特性, 且多个孤立的银纳米颗粒会表现出与 1 个银纳米颗粒不一样的光电响应特性. 同时, LSPR 导致的光响应特性与光源的偏振、 颗粒尺寸、颗粒个数以及颗粒之间的距离有依赖关系. 这一结果不仅对锗在光电子领域的应用有重要意义, 也可以拓宽局域表面等离子体在纳米光电子领域的应用范围.
关键词： 光电子; 局域表面等离子体共振; 时域有限差分法; 银纳米颗粒; 消光光谱
齐功民, 狄增峰, 任伟 . 局域表面等离子体增强锗的光电响应特性[J]. 上海大学学报(自然科学版), 2018 , 24(2) : 207 -216 . DOI: 10.12066/j.issn.1007-2861.1816
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.
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