Operating mode dependent energy transfer efficiency in a quantum well waveguide

• Published in: Laser physics 2023-10, Vol.33 (10), p.106001
• Main Authors: Al-Dolaimy, F, Kzar, M H, Jamil, N Y, Zaid, M, Rasen, F A, Hussain, S, Al-Majdi, K, Mohsen, K S, Alawadi, A H, Alsaalamy, A
• Format: Article
• Language: English
• Subjects: electromagnetically induced grating; electron spin coherence; quantum well waveguide
• ISSN: 1054-660X; 1555-6611
• DOI: 10.1088/1555-6611/acf4e4

In this paper, we delve into the intricate interplay between optical fields with varying relative phases in a closed-loop configuration semiconductor quantum well waveguide with four distinct energy levels, and how it impacts the Fraunhofer diffraction patterns obtained via four-wave mixing. By harnessing a strong control field, a standing wave driving field, and two weak probe and signal fields, we drive the waveguide to generate these patterns with maximum efficiency. To achieve this, we consider three distinct light-matter interaction scenarios, where the system is first set up in either a lower electromagnetically induced transparency or a coherent population trapping state, followed by a final state that enables electron spin coherence (ESC) induction. Our results reveal that the efficiency of Fraunhofer diffraction in the quantum well waveguide can be enhanced significantly under specific parameter regimes via the spin coherence effect. Further investigation of the light-matter interaction in the ESC zone, where only one of the control fields is a standing wave field, demonstrates that spin coherence facilitates more efficient transfer of energy from the probe light to the third and fourth orders, highlighting its crucial role in shaping the diffraction patterns.