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Quasi-phase-matched second-harmonic generation from asymmetric coupled quantum wells.

S Janz, F Chatenoud, R Normandin

|October 22, 2009

Summary

Researchers achieved optical second-harmonic generation in asymmetric coupled GaAs quantum wells. This novel superlattice structure enhanced visible light generation by 3.6 times compared to homogeneous GaAs, demonstrating efficient quasi-phase matching.

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Area of Science:

Optics and Photonics
Materials Science
Semiconductor Physics

Background:

Second-harmonic generation (SHG) is a key nonlinear optical process.
Superlattices offer unique properties for nonlinear optics.
Asymmetric quantum wells are crucial for efficient SHG.

Purpose of the Study:

To measure optical second-harmonic generation in a superlattice of asymmetric coupled GaAs quantum wells for the first time.
To demonstrate quasi-phase matching in such a structure.
To quantify the enhancement in SHG intensity compared to a homogeneous material.

Main Methods:

Fabrication of a superlattice with periodically reversed asymmetric GaAs quantum wells.
Excitation of the superlattice with a lambda = 1.319 microm fundamental laser in reflection geometry.
Measurement of the generated second-harmonic signal intensity and susceptibility.

Main Results:

First-time measurement of optical SHG in asymmetric coupled GaAs quantum wells.
Achieved quasi-phase matching by reversing quantum well orientation.
Observed a 3.6-fold increase in SHG intensity compared to homogeneous GaAs.

Conclusions:

The engineered superlattice effectively enhances visible light generation via SHG.
Quasi-phase matching in asymmetric coupled quantum wells is a viable strategy for nonlinear optics.
This work opens avenues for advanced photonic devices.