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Passive Filters

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...

Active Filters

Active Filters

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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Related Experiment Video

Updated: Jun 7, 2026

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Published on: May 11, 2014

Ultrahigh-efficiency, very narrowpassband, tunable optical filter.

S P Sandford, M E Thomas

|October 22, 2010

Summary

New optical filters achieve unprecedented performance at 532 nm. These narrow-passband, high-efficiency filters demonstrate precise design and fabrication for advanced optical applications.

Area of Science:

Optics and Photonics
Materials Science

Background:

Advanced optical filters are crucial for various scientific and technological applications.
Existing filter technologies face limitations in achieving both narrow passbands and high efficiency simultaneously.

Purpose of the Study:

To report the precise design and fabrication of novel narrow-passband, high-efficiency optical filters.
To achieve superior optical filter performance centered at 532 nm.

Main Methods:

Integration of recently developed technologies for optical filter fabrication.
Precise design and characterization of optical filters using advanced metrology.

Main Results:

Demonstrated fabrication of two optical filters with a central frequency of 532 nm.

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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Last Updated: Jun 7, 2026

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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One filter exhibited a 70 pm passband with >90% efficiency.

A second filter achieved a 7 pm passband with >80% efficiency.

Conclusions:

The developed optical filters meet and exceed design specifications.
The integrated technologies enable unprecedented performance in narrow-band, high-efficiency optical filtering.
These filters are suitable for demanding optical applications requiring precise wavelength selection.