On second harmonic generation and multiphoton-absorption induced luminescence from laser-reshaped silver nanoparticles embedded in glass
On second harmonic generation and multiphoton-absorption induced luminescence from laser-reshaped silver nanoparticles embedded in glass
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DOI：
10.1088/0957-4484/27/43/435703
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发表时间：
2016-09
期刊：
影响因子：
3.5
通讯作者：
S. Zolotovskaya;M. Tyrk;A. Stalmashonak;W. Gillespie;Amin Abdolvand
中科院分区：
文献类型：
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作者：
S. Zolotovskaya;M. Tyrk;A. Stalmashonak;W. Gillespie;Amin Abdolvand
嵌入钠钙玻璃中的直径为30 nm的球形银纳米颗粒（NP）在通过在NP的表面等离子体共振带内操作的线性偏振250 fs脉冲激光照射后均匀地再成形（伸长）。我们观察到二次谐波产生（SHG）和多光子吸收诱导发光（MAIL）在嵌入的激光整形纳米粒子皮秒（10 ps）脉冲激光激发在1064 nm。SHG和MAIL的补充研究在钠钙玻璃中进行，所述钠钙玻璃含有与激光再成形的NP具有类似伸长率（纵横比）的嵌入的机械再成形的银NP。这支持的概念，观察到的差异，在所研究的纳米复合材料系统中的SHG和MAIL是由于形状修改机制。采用离散偶极子近似法计算了不同伸长率的纳米粒子的吸收和散射截面。
Spherical silver nanoparticles (NPs) of 30 nm diameter embedded in soda-lime glass were uniformly reshaped (elongated) after irradiation by a linearly polarised 250 fs pulsed laser operating within the NPs’ surface plasmon resonance band. We observed second harmonic generation (SHG) and multiphoton-absorption-induced luminescence (MAIL) in the embedded laser-reshaped NPs upon picosecond (10 ps) pulsed laser excitation at 1064 nm. A complementary study of SHG and MAIL was conducted in soda-lime glass containing embedded, mechanically-reshaped silver NPs of a similar elongation ratio (aspect ratio) to the laser-reshaped NPs. This supports the notion that the observed difference in SHG and MAIL in the studied nanocomposite systems is due to the shape modification mechanism. The discrete dipole approximation method was used to assess the absorption and scattering cross-sections of the reshaped NPs with different elongation ratios.