Ultrafast wavelength conversion device by semiconductor multilayer coupled cavity with quantum dots

2015 Fiscal Year Final Research Report

• Project/Area Number: 24360028
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Applied optics/Quantum optical engineering
• Research Institution: The University of Tokushima
• Principal Investigator: Isu Toshiro 徳島大学, ソシオテクノサイエンス研究部, 特任教授 (00379546)
• Co-Investigator(Kenkyū-buntansha): KITADA TAKAHIRO 徳島大学, 大学院ソシオテクノサイエンス研究部, 特任准教授 (90283738) ; KUMAGAI NAOTO 徳島大学, 大学院ソシオテクノサイエンス研究部, 特任講師 (40732152) ; LU XIANGMENG 徳島大学, 大学院ソシオテクノサイエンス研究部, 特任助教 (80708800) ; MORITA KEN 千葉大学, 工学研究科, 准教授 (30448344)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 量子ドット / 微小共振器 / 超高速光スイッチ / 非線形光学応答 / キャリア緩和 / MBE,エピタキシャル成長 / 化合物半導体多層膜 / 波長変換

Outline of Final Research Achievements

In order to realize an ultrafast wavelength-conversion device, we investigated nonlinear responses of a semiconductor multi-layer triple-coupled cavity with quantum dots (QDs) and crystal growth of the structure. We obtained ultrafast nonlinear transmission change of a cavity with the Er-doped quantum dots embedded in a thin strain-relaxed layer. We also found that the wavelength conversion signal by the four-wave-mixing was absorbed in the QDs, although degenerate four-wave-mixing signals were clearly observed due to saturable absorption. In the case of a triple-coupled cavity with QDs which were transparent for the incident lights, wavelength conversion signals were clearly observed. We confirmed that the triple-coupled cavity structure with QDs was promising for application to ultrafast wavelength-conversion devices.

Free Research Field

工学（応用光学・量子光工学）