Post deposition heat treatment induced modifications in nanoplasmonic response in glancing angle deposited (GLAD) Ag nanostructures were systematically investigated. The as deposited GLAD Ag thin films were annealed at various temperatures namely 200°C, 250°C, 300°C and 350°C in air atmosphere. The reduction in localized surface plasmon resonance (LSPR) absorption peak width was detected with annealing. Morphological characterization of the as deposited and annealed films revealed reduction in grain size and shape distributions responsible for narrowing of the LSPR peak width. The refractive index sensitivities of the as deposited and annealed films were measured using an in‐house developed optical setup and figure of merit (FOM) of the sensors were also estimated. An increase in FOM of the sensors was observed upon annealing while sensitivity was found to be reduced. E‐field profile surrounding the Ag nanoparticles was also simulated to explain the experimental observations on refractive index sensitivity of the films.This article is protected by copyright. All rights reserved.
The use of optical coherence tomography (OCT) for noncontact three-dimensional aspheric lens profiling and retrieval of aspheric surface parameters is demonstrated. Two commercially available aspheric lenses with different focal length-to-diameter ratio have been imaged using OCT, and the measured optical path length distribution has been least square fitted with the aspheric lens surface retrieving the radius of curvature, aspheric constant, and conic constants. The refractive index of these lenses has also been measured referencing with a standard Zerodur glass flat. The fitted aspheric surface coefficients of the lenses are in close agreement with the manufacturer’s values, thus, envisaging the potential of OCT in rapid screening, testing of aspheric lenses, and other micro-optical components such as those used in illumination optics.
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