Refractive index devetion using a self-mixing interferometer

Miia Määttälä, Jukka Hast, Risto Myllylä

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    A self-mixing interferometer is proposed to detect the change of refractive index of a sample. As light source, the developed measurement system uses a blue emitting GaN laser diode. An external mirror, driven by a piezo nanopositioner, is used to reflect the light and produce an interference signal which is detected with the monitor photodiode of the laser. The change of the refractive index is demonstrated by changing the optical path length of the external cavity by changing the offset-voltage of the piezo positioner. This introduces a phase difference to the interference signal. The results show that by considering the measured sensitivity of the setup, about 1,9x10-7 changes in the refractive index can be detected in 1 cm optical path length.
    Original languageEnglish
    Title of host publicationProceedings of ODIMAP V
    Subtitle of host publication5th Topical Meeting on Optoelectronic Distance/Displacement Measurements and Applications
    Place of PublicationSpain
    PublisherIEEE Institute of Electrical and Electronic Engineers
    Pages315-320
    ISBN (Print)84-690-0938-9
    Publication statusPublished - 2006
    MoE publication typeA4 Article in a conference publication
    Event5th Topical Meeting on Optoelectronic Distance/Displacement Measurement and Applications - Madrid, Spain
    Duration: 2 Oct 20064 Oct 2006

    Conference

    Conference5th Topical Meeting on Optoelectronic Distance/Displacement Measurement and Applications
    Abbreviated titleODIMAP V
    CountrySpain
    CityMadrid
    Period2/10/064/10/06

    Keywords

    • interferometry
    • fringe pattern analysis
    • time domain methods
    • biosensor

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