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Related Concept Videos

Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
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Active Filters01:25

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Nose and Nasal Cavity01:24

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The nose is composed of an observable exterior segment (external nose) and an internal segment within the skull known as the nasal cavity (internal nose). The external nose, visible on the face, consists of a framework of bone and hyaline cartilage enveloped in skin and muscle and lined with a mucous membrane. This structure is supported by the frontal bone, nasal bones, and maxillary bone and is supplemented by a cartilaginous framework comprising the septal nasal cartilage, lateral nasal...
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Standing Waves in a Cavity01:28

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Related Experiment Video

Updated: Feb 2, 2026

In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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Mid-infrared cavity resonator integrated grating filters.

S Augé, S Gluchko, A L Fehrembach

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    Novel Mid-Infrared Cavity Resonator Grating Filters (CRIGFs) demonstrate narrow-band reflectivity peaks. Fabricated in GaAs/AlGaAs, these filters show potential for broad spectral coverage in infrared applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Mid-infrared (MIR) spectral range is crucial for various applications including spectroscopy, sensing, and telecommunications.
    • Developing efficient and tunable filters for the MIR region remains a significant challenge.

    Purpose of the Study:

    • To design and fabricate Cavity Resonator Grating Filters (CRIGFs) for operation in the Mid-Infrared (MIR) spectral range.
    • To investigate the optical properties, specifically reflectivity and bandwidth, of these novel filters.

    Main Methods:

    • CRIGFs were fabricated using the GaAs/AlGaAs material system.
    • Optical characterization was performed to measure reflectivity peaks and spectral width.

    Main Results:

    • Narrow-band resonant reflectivity peaks were observed around 2200 cm-1 (4.6 µm).
    • The filters exhibit a peak reflectivity of 30% for TE-polarized light.
    • A narrow full width at half maximum (FWHM) of 4 cm-1 was achieved.

    Conclusions:

    • GaAs/AlGaAs CRIGFs are a promising technology for MIR filtering applications.
    • The demonstrated performance suggests potential for covering the entire 1-12 µm spectral range.
    • These filters offer a pathway to enhanced performance in MIR optical systems.