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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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Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle
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Graphene-based mid-infrared plasmonic isolator with multimode interferometer.

Mohsen Heidari, Vahid Ahmadi

    Optics Letters
    |October 15, 2020
    PubMed
    Summary

    Researchers developed a compact graphene plasmonic isolator using a multimode interference (MMI) structure. This device offers high optical isolation and a wide bandwidth, paving the way for advanced photonic integrated circuits.

    Area of Science:

    • Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Plasmonic devices offer miniaturization potential for optical components.
    • Non-reciprocity is crucial for optical isolation, preventing back-propagation of light.
    • Multimode interference (MMI) structures are widely used in integrated optics.

    Purpose of the Study:

    • To present an extremely compact graphene-based plasmonic isolator.
    • To utilize the non-reciprocal phase shift effect for optical isolation.
    • To investigate MMI-based isolator design using the mth self-imaging approach.

    Main Methods:

    • Design and simulation of a two-port MMI structure using graphene.
    • Exploration of the non-reciprocal phase shift effect.

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  • Analysis of device geometry and m parameter influence on performance metrics.

    • Main Results:

    • Achieved ultra-compact MMI isolators with footprints as small as 0.5µm×4.02µm (≈λ²/32).
    • Demonstrated high isolation ratios (ISR) of up to 27.1 dB.
    • Obtained an ultra-wide 20 dB isolation bandwidth (BW) from 0.75 to 2.34 THz.

    Conclusions:

    • The proposed graphene-based MMI isolator offers a highly compact solution for optical isolation.
    • The device performance is sensitive to geometric parameters and the m value, allowing for design optimization.
    • The achieved wide bandwidth and high isolation ratio are promising for integrated photonic applications.