Infrared near-field detection of a narrow resonance due to molecular vibrations in a nanoparticle.
Infrared near-field detection of a narrow resonance due to molecular vibrations in a nanoparticle.
复制标题
由于纳米粒子中的分子振动而产生的窄共振的红外近场检测。
DOI：
10.1021/la0625594
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Walker,GilbertC
中科院分区：
文献类型：
--
作者：
Romanov,Vyacheslav;Walker,GilbertC
Di-iron nonacarbonyl particles on a gold surface have been imaged using an apertureless near-field scanning infrared microscopy. First and second harmonic detection, with and without an auto-homodyning option, have been used to collect the near-field spectrum of a single vibrational mode of the bridging carbonyls in di-iron nonacarbonyl nanocrystalline flakes on a gold surface. The experimental results have been compared to two theoretical models, a static image-dipole effective medium and an image dipole modified by a Fresnel coefficient for the appropriate observation angle. The calculations have taken into account the roughness of the gold film. The phase dependence of the near-field contrast has been investigated using broadband and tunable CO2lasers. Particle size effects on contrast and spatial resolution have been studied to determine the limits of applicability of the half-space approximation.
