High extraction efficiency of single photon emission from individual carbon nanotubes

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K15199
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 30020:Optical engineering and photon science-related
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Yamashita Daiki 国立研究開発法人理化学研究所, 光量子工学研究センター, 訪問研究員 (40858099)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Keywords: カーボンナノチューブ / フォトニック結晶 / シリコンフォトニクス / 微小共振器 / 単一光子源 / 光物性

Outline of Final Research Achievements

Hybrid devices between carbon nanotubes and silicon photonics were characterized. We investigated the effects of photonic crystal cavity design, Q-value, and nanotube coupling method to the cavity. The emission from the nanotubes enhanced by the cavity was successfully guided into the waveguide and detected. In addition, a method to reduce non-radiative recombination due to substrate contact was investigated. By placing the nanotubes on a high plateau, the photoluminescence intensity was maintained, and single-photon generation from the nanotubes coupled to the cavity was demonstrated. Furthermore, by sandwiching a two-dimensional material between the nanotubes and the cavity substrate as a spacer, a device with virtually no increase in non-radiative recombination was realized.

Free Research Field

シリコンフォトニクス

Academic Significance and Societal Importance of the Research Achievements

カーボンナノチューブとシリコンフォトニクスを融合させたデバイスの作製に取り組み，共振器と結合して増強されたナノチューブからの発光を導波路に取り込むことに成功し，高効率光取り出しが可能なデバイスを実証できた．このような導波路結合光は、シリコン基板上に集積された様々な光部品や，光ファイバに容易に接続することができ，単一カーボンナノチューブ光デバイスの応用性を広げることができる．また，ナノチューブの基板集積時に問題になる基板接触による発光減少を回避する方法を提案し，ナノチューブ-シリコンフォトニクス集積デバイスにおける有用性を実証できた．