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Oscillations In An LC Circuit

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by

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Updated: Apr 27, 2026

Fabrication and Testing of Microfluidic Optomechanical Oscillators

Fabrication and Testing of Microfluidic Optomechanical Oscillators

Published on: May 29, 2014

Lasing from active optomechanical resonators.

T Czerniuk¹, C Brüggemann¹, J Tepper¹

¹Experimentelle Physik 2, TU Dortmund, Dortmund 44227, Germany.

Nature Communications

|July 11, 2014

Summary

This summary is machine-generated.

Planar microcavities with distributed Bragg reflectors host mechanical resonances. Integrating active semiconducting layers into these structures enables strong optomechanical interactions and modulation of laser emission up to 40 GHz.

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Area of Science:

Optomechanics
Nanophotonics
Semiconductor Lasers

Background:

Planar microcavities with distributed Bragg reflectors (DBRs) exhibit confined optical modes and mechanical resonances.
These mechanical resonances, with frequencies in the 10-100 GHz range and high quality factors (>1,000), arise from stop bands in the DBR phonon dispersion relation.
Optomechanical systems offer enhanced light-matter interaction for novel light manipulation techniques.

Purpose of the Study:

To investigate the strong interaction between photons, phonons, and electrons within an optomechanical system.
To implement active semiconducting layers into a microcavity to create a functional vertical-cavity surface-emitting laser (VCSEL).
To demonstrate modulation of VCSEL laser emission via optomechanical coupling.

Main Methods:

Fabrication of a microcavity incorporating active semiconducting layers to form a VCSEL.
Injection of a picosecond strain pulse into the VCSEL to excite mechanical resonances.
Measurement of VCSEL laser emission modulation resulting from optomechanical interactions.

Main Results:

Successful implementation of active semiconducting layers within the microcavity, creating a VCSEL.
Excitation of long-living mechanical resonances within the VCSEL by a picosecond strain pulse.
Observation of modulation in the VCSEL laser intensity at frequencies up to 40 GHz.

Conclusions:

Strong interaction between photons, phonons, and electrons is achievable in active optomechanical resonators.
Optomechanical coupling can effectively modulate VCSEL laser emission.
Active optomechanical resonators integrated into nanophotonic circuits hold promise for future applications.