Observation of photoexcited carrier propagation using time-resolved multi-probe SNOM

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K04599
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nanostructural physics
• Research Institution: University of Yamanashi
• Principal Investigator: SAKAI Masaru 山梨大学, 大学院総合研究部, 准教授 (10371709)
• Co-Investigator(Kenkyū-buntansha): 石川 陽 山梨大学, 大学院総合研究部, 准教授 (10508807) ; 東海林 篤 山梨大学, 大学院総合研究部, 准教授 (40392724)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 近接場光学顕微鏡 / 時間分解測定 / キャリアダイナミクス

Outline of Final Research Achievements

The purpose of this research is to clarify the propagation and/or diffusion process of photoexcited carriers generated in a semiconductor quantum well. We carried out both experimental and theoretical study. Experimentally, we developed a time-resolved multi-probe scanning near-field optical microscope that enables high resolution measurement in both spatial and time, and observed diffusion of photoexcited carriers in InGaN quantum well in detail. In theory, we constructed a phenomenological analytical model incorporating local excitation and luminescence processes into diffusion equations and identified important parameters in carrier diffusion from comparison with experimental results.

Free Research Field

ナノフォトニクス