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

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...

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:

What is Genetic Engineering?

What is Genetic Engineering?

Heat Engines

Heat Engines

A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam engine on an old-style train can produce the work needed for driving the train.
Whenever we consider heat engines (and associated devices such as refrigerators and heat pumps), we do not use the standard sign convention for heat and work. For convenience, we assume that the symbols Qh, Qc, and W represent only the amounts of heat transferred...

Internal Combustion Engine

Internal Combustion Engine

The internal combustion engine is a heat engine that uses the byproducts of combustion as the working fluid instead of using a heat transfer medium to transfer heat. The combustion is done in a way that produces high-pressure combustion products that can be expanded through a turbine or piston to create work. Internal combustion engines can again be categorized into three kinds: (1) spark ignition gasoline engines, most commonly used in automobiles, (2) compression ignition diesel engines that...

X-ray Crystallography

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...

You might also read

Related Articles

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

Sort by

Same author

Ozone induced pulmonary injury and respiratory dysfunction: Evidence, underlying mechanism and target investigation.

Environmental pollution (Barking, Essex : 1987)·2026

Same author

Edge-emitting LED refractometer.

Optics express·2026

Same author

Frailty and associated factors in women aged 65 years and older with breast cancer: a cross-sectional study.

BMC geriatrics·2026

Same author

Artificial Intelligence for Materials Science: Transforming Research Paradigms.

Chemical reviews·2026

Same author

Fabrication of mechanically processable gelatin-based hydrogel adhesives via a rehydration method for enhanced functionality.

International journal of biological macromolecules·2026

Same author

Current status and influencing factors of knowledge, attitude and practice of diet management in patients with enterostomy: a cross-sectional study.

BMJ open·2026

Search research articles

Related Experiment Video

Updated: Jan 29, 2026

Writing Bragg Gratings in Multicore Fibers

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Bragg filter bandwidth engineering in subwavelength grating metamaterial waveguides.

Pavel Cheben, Jiří Čtyroký, Jens H Schmid

|February 16, 2019

Summary

We developed a new silicon subwavelength grating (SWG) waveguide design for Bragg gratings. This novel geometry allows precise control over grating strength and spectral bandwidth in integrated photonic circuits.

More Related Videos

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Published on: June 28, 2024

Related Experiment Videos

Last Updated: Jan 29, 2026

Writing Bragg Gratings in Multicore Fibers

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Published on: June 28, 2024

Area of Science:

Photonics
Integrated Optics
Materials Science

Background:

Bragg gratings are essential components in integrated photonic circuits.
Achieving precise control over grating strength and narrow spectral bandwidths is challenging in high-index contrast platforms like silicon-on-insulator.

Purpose of the Study:

To demonstrate a novel Bragg grating geometry for improved performance in silicon-on-insulator photonic circuits.
To achieve tunable spectral bandwidths and controlled grating strength using a new waveguide design.

Main Methods:

Utilized a silicon subwavelength grating (SWG) waveguide.
Implemented evanescently coupled periodic Bragg loading segments positioned outside the SWG core.
Adjusted the distance of Bragg loading segments and their relative phase shift to tune performance.

Main Results:

Demonstrated experimental 3 dB filter bandwidths ranging from 8 nm down to 150 pm.
Achieved precise control over spectral bandwidth by modifying Bragg loading segment parameters.
The demonstrated structure features a minimum feature size of 100 nm.

Conclusions:

The novel Bragg grating geometry offers a promising solution for advanced integrated photonic circuits.
This approach enables fine-tuning of spectral bandwidths, crucial for various photonic applications.
The design is compatible with high-index contrast platforms and advanced fabrication techniques.