Generation mechanism of ultrashort pulsed superfluorescence from semiconductor quantum dot assembly

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400320
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Tokyo University of Science
• Principal Investigator: MIYAJIMA Kensuke 東京理科大学, 理学部第一部応用物理学科, 准教授 (20397764)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 超蛍光 / 励起子分子 / 量子ドット / コヒーレンス / 超短パルス

Outline of Final Research Achievements

We focused on superfluorescence, which is a cooperative spontaneous emission from many excited two-level systems coupled coherently, and researched a generation mechanism of ultrashort pulsed superfluorescence from semiconductor quantum dot (QD) assembly. As a result, we clarified that our samples, CuCl QD assembly, exhibited generation of the superfluorescence at temperature higher compared to the other solid-state materials. This characteristic is induced from ultrafast formation of coherence among the QDs due to the short radiative spontaneous lifetime. In addition, we showed a possibility of generation of ultrashort pulses whose time width less than 1 ps by controlling the QD density.

Free Research Field

光物性