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IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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NIR spectrometer using a Schottky photodetector enhanced by grating-based SPR.

Wenjing Chen, Tetsuo Kan, Yoshiharu Ajiki

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    PubMed
    Summary
    This summary is machine-generated.

    We developed a new near-infrared (NIR) spectrum measurement technique using a Schottky photodetector enhanced by surface plasmon resonance (SPR). This SPR-enhanced detector achieves wavelength resolution comparable to commercial spectrometers.

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    Area of Science:

    • Optoelectronics
    • Spectroscopy
    • Plasmonics

    Background:

    • Near-infrared (NIR) spectroscopy is crucial for material analysis.
    • Conventional spectrometers can be bulky and expensive.
    • Developing compact and cost-effective spectral measurement methods is desirable.

    Purpose of the Study:

    • To present a novel NIR spectrum measurement method.
    • To utilize surface plasmon resonance (SPR) for enhanced photodetection.
    • To achieve wavelength-selective detection using a Schottky photodetector.

    Main Methods:

    • Fabrication of an SPR coupler using an Au grating on an n-type silicon wafer.
    • Formation of a Schottky barrier for photodetection.
    • Utilizing SPR coupling angle for wavelength selectivity.
    • Pre-calculation of a characteristic matrix for spectral reconstruction.
    • Measurement of photocurrents at various SPR coupling angles.

    Main Results:

    • The SPR-enhanced Schottky photodetector demonstrated wavelength-selective photodetection.
    • The method successfully obtained spectra for single and multiple wavelengths.
    • Spectral resolution was found to be comparable to commercial spectrometers.
    • The pre-calculated matrix effectively described the photodetector's characteristics.

    Conclusions:

    • The proposed method offers a viable approach for NIR spectrum measurement.
    • SPR enhancement provides wavelength selectivity in Schottky photodetectors.
    • This technique presents a potentially more compact and cost-effective alternative to traditional spectrometers.