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Related Concept Videos

Passive Filters01:27

Passive Filters

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.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...

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Updated: Jun 8, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Published on: April 4, 2017

High-performance and highly stable 0.3-nm-full-width-at-half-maximum interference optical filters.

T Yanagimachi, H Oguri, J Nayyer

    Applied Optics
    |October 2, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed stable, very-narrow-bandpass optical tunable filters with a 0.3 nm full width at half-maximum (FWHM). This was achieved by using tantalum pentoxide and optimizing layer thicknesses for reduced polarization shifts.

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    15:25

    Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

    Published on: February 4, 2018

    Area of Science:

    • Optical Engineering
    • Materials Science
    • Thin Film Technology

    Background:

    • Narrow-bandpass optical filters are crucial for various applications, including spectroscopy and telecommunications.
    • Existing fabrication methods often face challenges in achieving high film density and stability.
    • Polarization-dependent wavelength shifts can limit filter performance when tilted.

    Purpose of the Study:

    • To fabricate very-narrow-bandpass optical tunable filters with a 0.3 nm full width at half-maximum (FWHM).
    • To enhance film density and filter stability using advanced deposition techniques.
    • To minimize central wavelength shifts concerning p and s polarizations when the filter is tilted.

    Main Methods:

    • Utilized oxygen ion-assisted deposition to improve film densities.
    • Replaced titanium dioxide (TiO2) with tantalum pentoxide (Ta2O5) for enhanced compatibility with ion-assisted fabrication.
    • Modified the relative thicknesses of the multilayer structure from 1/2/1 to 0.998/2.007/0.998.

    Main Results:

    • Successfully fabricated optical tunable filters with a 0.3 nm FWHM.
    • Achieved improved film densities and enhanced filter stability.
    • Demonstrated a significant reduction in the shift difference of central wavelengths for p and s polarizations upon tilting.

    Conclusions:

    • The developed fabrication method, utilizing Ta2O5 and optimized layer thicknesses, enables the production of highly stable, very-narrow-bandpass optical tunable filters.
    • The ion-assisted deposition technique is effective in improving film density for optical filter fabrication.
    • The modified layer structure effectively mitigates polarization-dependent wavelength shifts, enhancing filter performance in tilted conditions.