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

Cut-off Frequency of BJT

Cut-off Frequency of BJT

Cut-off frequencies in Bipolar Junction Transistors (BJTs) mark the transition between the signal's pass band and stop band, influencing their performance in amplifying or attenuating frequencies. These frequencies are crucial for designing BJTs to meet specific operational requirements in electronic circuits.
Alpha Cut-Off Frequency: Pertinent to the common-base configuration, the alpha cut-off frequency defines the upper-frequency limit at which the current gain, alpha, remains stable. As...

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

Generating Electromagnetic Radiations

Generating Electromagnetic Radiations

The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...

You might also read

Related Articles

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

Sort by

Same author

Nanophotonic waveguide chip-to-world beam scanning.

Nature·2026

Same author

Overcoming stress limitations in SiN nonlinear photonics via a bilayer waveguide.

Nanophotonics (Berlin, Germany)·2025

Same author

Simultaneous on-chip generation of violet, blue, cyan, green, yellow, orange, and red light from an octave-spanning infrared frequency comb.

Optics express·2025

Same author

Nonlinear Dynamics of Coupled-Resonator Kerr Combs.

Physical review letters·2025

Same author

Synthesis of Yttria Nanoparticle-Loaded Electrospun Nanofibers for Enhanced Antimicrobial Activity, Biofilm Inhibition, and Alleviation of Diabetic Wounds.

ACS applied bio materials·2025

Same author

Automated tuning of a ring-assisted MZI-based interleaver for Kerr frequency combs.

Optics letters·2025

Search research articles

Related Experiment Video

Updated: May 29, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Octave-spanning frequency comb generation in a silicon nitride chip.

Yoshitomo Okawachi¹, Kasturi Saha, Jacob S Levy

¹School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA. yo22@cornell.edu

|September 3, 2011

Summary

We generated an octave-spanning frequency comb using cascaded four-wave mixing in a silicon nitride microring resonator. This parametric comb exhibits low radio-frequency amplitude noise when the pump laser is tuned to the cavity resonance.

More Related Videos

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

Published on: August 8, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Related Experiment Videos

Last Updated: May 29, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

Published on: August 8, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Area of Science:

Photonics and Optical Engineering
Materials Science
Quantum Optics

Background:

Frequency combs are crucial for precise optical measurements.
Parametric processes in microresonators offer compact frequency comb generation.
Silicon nitride offers high optical nonlinearities and low loss for integrated photonics.

Purpose of the Study:

To demonstrate an octave-spanning frequency comb using cascaded four-wave mixing.
To investigate the radio-frequency (RF) amplitude noise of the generated parametric comb.
To explore the tunability and noise characteristics of the comb by varying pump power and frequency.

Main Methods:

Utilized a monolithic, high-Q silicon nitride microring resonator.
Employed cascaded four-wave mixing initiated by a single-frequency pump laser at 1562 nm.
Investigated RF amplitude noise by tuning the pump frequency relative to the cavity resonance.

Main Results:

Achieved an octave-spanning frequency comb covering 128 THz with 226 GHz spacing.
Demonstrated tunability of the comb spacing with pump power.
Observed a low-noise state with up to 30 dB noise reduction when the pump frequency was tuned into cavity resonance.

Conclusions:

Cascaded four-wave mixing in silicon nitride microring resonators is an effective method for generating broadband frequency combs.
The parametric frequency comb exhibits tunable characteristics and can achieve low RF noise operation.
This work paves the way for compact, low-noise frequency comb sources for various applications.