Nano-Ag on vanadium dioxide. II. Thermal tuning of surface plasmon resonance
Nano-Ag on vanadium dioxide. II. Thermal tuning of surface plasmon resonance
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DOI：
10.1063/1.2973341
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发表时间：
2008-09
影响因子：
3.2
通讯作者：
Gang Xu;Chunming Huang;M. Tazawa;P. Jin;Demin Chen
中科院分区：
文献类型：
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作者：
Gang Xu;Chunming Huang;M. Tazawa;P. Jin;Demin Chen
实验研究了VO 2热致变色薄膜上Ag纳米粒子的局域表面等离子体共振（LSPR）的热调谐。调谐是强烈的温度依赖性和热可逆的。在30 ~ 80 °C范围内，LSPR波长λSPR随温度的升高而蓝移，随温度的降低而红移。在以逐步方式控制温度的条件下，可以实现智能调谐。可调谐波长范围取决于金属纳米颗粒膜的颗粒尺寸或质量厚度。此外，当引入一层TiO 2以包覆Ag纳米颗粒时，发现可调谐性显著增强，产生显著的灵敏度因子ΔλSPR/Δn，在VO 2的半导体相处每折射率单位（n）高达480 nm。
Thermal tuning of the localized surface plasmon resonance (LSPR) of Ag nanoparticles on a thermochromic thin film of VO2 was studied experimentally. The tuning is strongly temperature dependent and thermally reversible. The LSPR wavelength λSPR shifts to the blue with increasing temperature from 30 to 80 °C, and shifts back to the red as temperature decreases. A smart tuning is achievable on condition that the temperature is controlled in a stepwise manner. The tunable wavelength range depends on the particle size or the mass thickness of the metal nanoparticle film. Further, the tunability was found to be enhanced significantly when a layer of TiO2 was introduced to overcoat the Ag nanoparticles, yielding a marked sensitivity factor ΔλSPR/Δn, of as large as 480 nm per refractive index unit (n) at the semiconductor phase of VO2.