Analysis of the space-charge field in photorefractive multiple quantum well structures under a moving gratings for a variable trapping coefficient

Blazej Jablonski; Andrzej Ziółkowski; Marek Wichtowski; Ewa Weinert-Rączka

doi:10.1117/12.2520352

15 March 2019 Analysis of the space-charge field in photorefractive multiple quantum well structures under a moving gratings for a variable trapping coefficient

Blazej Jablonski, Andrzej Ziółkowski, Marek Wichtowski, Ewa Weinert-Rączka

Author Affiliations +

Proceedings Volume 11045, Optical Fibers and Their Applications 2018; 110450Q (2019) https://doi.org/10.1117/12.2520352
Event: 18th Conference on Optical Fibers and Their Applications, 2018, Naleczow, Poland

Abstract

Photorefractive quantum wells are nonlinear materials characterised by high sensitivity and a fairly fast response (≈ μs) at relatively low densities of optical power (μW/cm²). For structures working in the Franz-Keldysh geometry (with the electric field parallel to quantum wells) observed phenomena are related to the nonlinearity of electrons transport, i.e. the dependence of electron mobility on electric field intensity. This phenomenon plays an important role in photorefractive two-wave mixing, causing the shift of the space-charge field relative to the interference pattern, which allows obtaining high photorefractive gain, reaching 1000 cm^-1 for E=10 kV/cm. One of the parameters of SI-MQW structures that affects nonlinear transport is the electron and hole trapping coefficient. In the literature describing the processes taking place in GaAs/AlGaAs quantum wells that value is presented as constant. In article, the authors describe experiments testing the effect of strong electric field on the electron and hole trapping coefficients for bulk GaAs. An analysis of how the electric field-dependent trapping coefficient affects the process of two-wave mixing in MQW structures is discussed in. The results presented therein relate only to the stationary interference pattern. However in some studies the shift of the electric field distribution relative to the distribution of light intensity is obtained by using a moving interference pattern. We present the results of a numerical analysis of the impact of the electric field-dependent carriers trapping coefficients on the space-charge field formation under a moving grating.

Citation Download Citation

Blazej Jablonski, Andrzej Ziółkowski, Marek Wichtowski, and Ewa Weinert-Rączka "Analysis of the space-charge field in photorefractive multiple quantum well structures under a moving gratings for a variable trapping coefficient", Proc. SPIE 11045, Optical Fibers and Their Applications 2018, 110450Q (15 March 2019); https://doi.org/10.1117/12.2520352

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Electrons

Quantum wells

Gallium arsenide

Absorption

Phase shifts

Two wave mixing

Numerical analysis

Show All Keywords

Keywords/Phrases

Search In:

Publication Years