Determining the refractive index profile of micro-optical elements using transflective digital holographic microscopy

Yu Chih Lin, Chau Jern Cheng

    Research output: Contribution to journalArticlepeer-review

    38 Citations (Scopus)

    Abstract

    This study proposes a novel method for directly measuring the spatial distribution of the refractive index of transparent or semi-transparent micro-optical elements using digital holographic microscopy, which involves transmission and reflection architectures. The proposed transflective digital holographic microscope system simultaneously records both the transmitted and the reflected waves from the micro-optical element and then numerically reconstructs the phase information and refractive index profile. No prior knowledge of the thickness and curvature of the element to be measured is required. In this study, the spatial refractive index profiles of a microlens array and a gradient index lens are demonstrated experimentally. Unlike the conventional scanning refractive ray method, the proposed method supports the rapid full-field nondestructive measurement and direct observation of the spatial index variation and structure of micro-optical elements.

    Original languageEnglish
    Article number115402
    JournalJournal of Optics
    Volume12
    Issue number11
    DOIs
    Publication statusPublished - 2010 Nov

    Keywords

    • Digital holographic microscopy
    • Micro-optics
    • Refractive index profile

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Atomic and Molecular Physics, and Optics

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