Field-effect transistor configuration for the measurement of infrared Stark spectra

Kenji Suzuki, Kenji Takashima, Yukio Furukawa

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    The infrared Stark spectrum of a thin film of poly(γ-benzyl-l-glutamate) (PBLG) has been measured in a field-effect transistor (FET) configuration, instead of the standard Stark cell with semitransparent metal electrodes. In the FET-type cell the PBLG film is sandwiched with an interdigital gold film and a SiO2/n-Si substrate; the gold and n-Si have been used as electrodes. The obtained Stark spectrum is in good agreement with that in the literature. Each of the observed Stark bands, which are assigned to the NH str, the C{double bond, short}O str of the ester group, and the amide I, has been decomposed into the zeroth-, first-, and second-derivative components by the least-squares method. The effective electric field in the PBLG film has been estimated from the obtained second-derivative component for each vibrational mode on the basis of the reported difference electric dipole moment, following excitation to a vibrationally excited state. The effective electric field is 0.42 times as large as that of the corresponding capacitor with a plate electrode instead of the interdigital one. The FET-type cell can be used for the measurements of infrared Stark spectra on the basis of the obtained effective electric field.

    Original languageEnglish
    Pages (from-to)456-460
    Number of pages5
    JournalScience and Technology of Advanced Materials
    Volume7
    Issue number5
    DOIs
    Publication statusPublished - 2006 Jul

    Fingerprint

    Field effect transistors
    Glutamic Acid
    Electric fields
    Infrared radiation
    Gold
    Electrodes
    Electric dipole moments
    Derivatives
    Amides
    Excited states
    Esters
    Capacitors
    Metals
    Thin films
    Substrates

    Keywords

    • Infrared spectroscopy
    • Poly(γ-benzyl-l-glutamate)
    • Vibrational Stark effect

    ASJC Scopus subject areas

    • Materials Science(all)

    Cite this

    Field-effect transistor configuration for the measurement of infrared Stark spectra. / Suzuki, Kenji; Takashima, Kenji; Furukawa, Yukio.

    In: Science and Technology of Advanced Materials, Vol. 7, No. 5, 07.2006, p. 456-460.

    Research output: Contribution to journalArticle

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