Room-temperature near-field reflection spectroscopy of single quantum wells

Wolfgang Werner Langbein, Jørn Marcher Hvam, Steen Madsen, M. Hetterich, C. Klingshirn

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    We report on a novel optical near-field technique to measure the local polarizability of a topographically flat sample with a spatial resolution better than 100 nm. Using an uncoated fiber probe, we implement a cross-polarization detection of the optical signal at the fiber dither frequency. This technique suppresses efficiently the otherwise dominating far-field background and reduces topographic artifacts. We demonstrate its performance on a thin, strained near-surface CdS/ZnS single quantum well at room temperature. The optical structure of these topographically flat samples is due to CdS thickness fluctuations, and is observed to be uncorrelated within the spatial resolution of the instrument.
    Original languageEnglish
    JournalPHYSICA STATUS SOLIDI A-APPLIED RESEARCH
    Volume164
    Issue number1
    Pages (from-to)541-546
    ISSN0031-8965
    DOIs
    Publication statusPublished - 1997

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