Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

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:

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Giant transmitted Goos-Hänchen amplification <i>via</i> high-Q resonant tunneling for angle-interrogation refractometry.

Physical chemistry chemical physics : PCCP·2026

Same author

Engineering the photonic spin Hall effect <i>via</i> strongly coupled epsilon-near-zero phonon polaritons.

Physical chemistry chemical physics : PCCP·2026

Same author

Temperature-activated switchable mid-infrared nonreciprocal thermal radiation based on Weyl semimetal and phase change materials.

Applied optics·2026

Same author

Graphene-enabled control of phonon polaritonic near-field radiative heat transfer in a CaCO<sub>3</sub> nanogap cavity.

Physical chemistry chemical physics : PCCP·2026

Same author

Hydrogen storage performance of Ti<sub>0.75</sub>Zr<sub>0.25</sub>Mn<sub>0.9</sub>CrFe<sub>0.1</sub> alloy with different preparation methods.

RSC advances·2026

Same author

Spectrally selective circular dichroism through resonant tunneling in Weyl-semimetal-based heterostacks.

Physical chemistry chemical physics : PCCP·2026

Search research articles

Related Experiment Video

Updated: Apr 21, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

Published on: July 18, 2015

Angle-insensitive and narrow band grating filter with a gradient-index layer.

Gaige Zheng, Jiawei Cong, Linhua Xu

|November 1, 2014

Summary

We designed an angle-insensitive guided mode resonance filter (GMRF) with narrow bandwidth and low sideband reflection for TE-polarized waves. This design is crucial for advanced optical devices like lasers and sensors.

More Related Videos

Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

Published on: February 3, 2023

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Published on: October 11, 2016

Related Experiment Videos

Last Updated: Apr 21, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

Published on: July 18, 2015

Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

Published on: February 3, 2023

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Published on: October 11, 2016

Area of Science:

Photonics and optical engineering
Materials science for optical applications

Background:

Guided mode resonance filters (GMRFs) are essential optical components.
Achieving angle-insensitivity in GMRFs is critical for practical applications.

Purpose of the Study:

To design an efficient angle-insensitive guided mode resonance filter (GMRF).
To investigate the impact of gradient-index layer design on filter performance.

Main Methods:

Simulated reflection properties of a multilayer structure.
Analyzed the effect of various gradient coefficients in the thin film design.
Evaluated filter performance across different incident angles for TE-polarized waves.

Main Results:

Demonstrated an angle-insensitive GMRF with narrow bandwidth and low sideband reflection.
Confirmed the critical role of gradient-index layer design for angle-insensitivity.
Observed stable resonant peak positions with increasing incident angles, despite minor line-shape asymmetry.

Conclusions:

The proposed GMRF design offers excellent angle-insensitivity and spectral characteristics.
This GMRF is a promising platform for integrated optical devices.
Potential applications include lasers, detectors, filters, and sensors.