Praturi Aparna, Schrod Stefan, Singh Bhanu Pratap, Vasa Parinda
Department of Physics, Indian Institute of Technology Bombay, 400076 Mumbai, India.
Department of Physics, University of Regensburg, 93053 Regensburg, Germany.
ACS Nanosci Au. 2022 Jul 18;2(6):486-493. doi: 10.1021/acsnanoscienceau.2c00014. eCollection 2022 Dec 21.
We demonstrate the use of white-light spectral interferometry as an effective technique involving only linear optical interactions and a partially coherent light source to measure the complex transmission response function of optical resonance and to determine the corresponding variation in the refractive index relative to a reference. We also discuss experimental arrangements to increase the accuracy and sensitivity of the technique. The superiority of the technique over single-beam absorption measurements is demonstrated by the accurate determination of the response function of the chlorophyll- solution. The technique is then applied to chlorophyll- solutions of varying concentrations and gold nanocolloids to characterize inhomogeneous broadening. Results on the inhomogeneity of gold nanocolloids are also supported by transmission electron micrographs, showing distributions of the size and shape of the constituent gold nanorods.
我们展示了白光光谱干涉测量法作为一种仅涉及线性光学相互作用和部分相干光源的有效技术的应用，该技术用于测量光学共振的复透射响应函数，并确定相对于参考的折射率的相应变化。我们还讨论了提高该技术准确性和灵敏度的实验装置。通过对叶绿素溶液响应函数的精确测定，证明了该技术相对于单光束吸收测量的优越性。然后将该技术应用于不同浓度的叶绿素溶液和金纳米胶体，以表征非均匀展宽。透射电子显微镜照片也支持了金纳米胶体不均匀性的结果，显示了组成金纳米棒的尺寸和形状分布。
