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Investigators at Indian Institute of Technology Describe Findings in Plasmonics

May 27, 2014

By a News Reporter-Staff News Editor at Physics Week -- Research findings on Plasmonics are discussed in a new report. According to news reporting originating from Maharashtra, India, by VerticalNews correspondents, research stated, "The refractive index (RI) sensitivity of a localized surface plasmon resonance (LSPR)-based fiber-optic probes is dependent on surface coverage of gold nanoparticles (GNP), fiber core diameter, and probe geometry. For U-bent LSPR fiber-optic probes, which demonstrated an order higher absorption sensitivity over straight probes, bend diameter and probe length may also have a significant influence on the sensitivity."

Our news editors obtained a quote from the research from the Indian Institute of Technology, "This study on U-bent fiber-optic LSPR probes is aimed at optimizing these parameters to obtain highest possible RI sensitivity. RI sensitivity increases linearly as a function of surface coverage of GNP in the range of 2-22 %. U-bent fiber-optic probes made of 200-, 400-, and 600-mu m fiber core diameter show optimum bend diameter value as -1.4 mm. In addition, RI sensitivity is almost the same irrespective of fiber core diameter demonstrating flexibility in choice of the fiber and ease in optical coupling. The length of the probe preceding and succeeding the bend region has significantly less influence on RI sensitivity allowing miniaturization of these probes."

According to the news editors, the research concluded: "In addition to these experimental studies, we present a theoretical analysis to understand the relative contribution of evanescent wave absorbance of GNP and refractive losses in the fiber due to GNP, towards the RI sensitivity."

For more information on this research see: Optimal Design for U-bent Fiber-optic LSPR Sensor Probes. Plasmonics, 2014;9(2):251-260. Plasmonics can be contacted at: Springer, 233 Spring St, New York, NY 10013, USA. (Springer -; Plasmonics -

The news editors report that additional information may be obtained by contacting J. Satija, Indian Inst Technol, Center Res Nanotechnol & Sci, Bombay 400076, Maharashtra, India. Additional authors for this research include N.S. Punjabi, V.V.R. Sai and S. Mukherji.

Keywords for this news article include: Asia, India, Plasmonics, Maharashtra

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Source: Physics Week

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