2017年第78回応用物理学会秋季学術講演会

講演情報

一般セッション(口頭講演)

4 JSAP-OSA Joint Symposia 2017 » 4.6 Nanocarbon and 2D Materials

[7p-A404-1~9] 4.6 Nanocarbon and 2D Materials

2017年9月7日(木) 13:15 〜 16:15 A404 (404)

宮内 雄平(京大)

14:30 〜 14:45

[7p-A404-5] Spectral tuning of optical coupling between air-mode nanobeam cavities and individual carbon nanotubes

Hidenori Machiya1,2、Takushi Uda1,2、Akihiro Ishii1、Yuichiro K. Kato1 (1.RIKEN、2.Univ. of Tokyo)

キーワード:carbon nanotubes, photonic crystals, Purcell effect

Air-mode nanobeam cavities allow for high efficiency coupling to air-suspended carbon nanotubes due to their unique mode profile that has large electric fields in air [1]. We have fabricated air-mode nanobeam cavities from silicon-on-insulator wafers and grown carbon nanotubes on top of the cavities (Fig. 1). Here we utilize heating-induced energy shift of carbon nanotube emission [2] to investigate the cavity quantum electrodynamics effects. In particular, we use laser-induced heating which causes a large blue-shift of the nanotube photoluminescence as the excitation power is increased. Combined with a slight red-shift of the cavity mode at high powers, the spectral overlap between the nanotube emission and the cavity can be controlled. We estimate the spontaneous emission enhancement at different spectral overlaps and find linear increase of the enhancement factor as the spectral overlap improves, which is consistent with Purcell enhancement of nanotube emission.