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Related Concept Videos

Clipper Circuit01:18

Clipper Circuit

682
A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
682

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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Subwavelength grating waveguide filter based on cladding modulation with a phase-change material grating.

S Hadi Badri, Saeid Gholami Farkoush

    Applied Optics
    |April 2, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel optical filter using silicon subwavelength gratings and phase-change materials. The device demonstrates tunable filtering and switching capabilities, paving the way for reconfigurable silicon photonics.

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    Area of Science:

    • Integrated photonics
    • Materials science
    • Optical engineering

    Background:

    • Subwavelength engineering and phase-change materials (PCMs) are crucial for advanced silicon photonics.
    • Germanium-antimony-telluride (Ge2Sb2Te5, GST) offers reversible phase transitions with significant optical property contrast.
    • PCMs enable new functionalities in integrated photonic devices.

    Purpose of the Study:

    • To design and analyze an optical filter utilizing a silicon subwavelength grating (SWG) coupled with GST.
    • To investigate the impact of GST geometry and placement on filter performance.
    • To demonstrate the switching and reconfigurable filtering capabilities of the proposed device.

    Main Methods:

    • Three-dimensional finite-difference time-domain (FDTD) simulations were employed.
    • The structure consists of an SWG waveguide evanescently coupled to periodic GST loading segments.
    • The effects of GST geometry and coupling distance were systematically studied.

    Main Results:

    • The GST loading segments significantly influence the filter's central wavelength and bandwidth.
    • The integrated GST provides optical switching functionality with a high extinction ratio of 28.8 dB.
    • Partial crystallization of GST enables reconfigurable filtering with a >4 nm blueshift.

    Conclusions:

    • The proposed SWG-GST optical filter offers a promising platform for integrated silicon photonics.
    • The device exhibits tunable filtering, switching, and reconfigurability.
    • This design advances the development of next-generation optical communication and computing systems.