[11a-E310-1~10] 3.11 Nanoscale optical science and near-field optics

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[11a-E310-3] Background suppression in hBN defect centers on a nanofiber via anti-Stokes excitation

〇Fumiya Okochi¹, Kengo Sakamoto¹, Hiroki Tanaka¹, Hideaki Takashima^1,2,3, Igor Aharonovich⁴, Shigeki Takeuchi^1,3 (1.Kyoto Univ., 2.CIST, 3.PQSC, 4.UTS)

Keywords:

Hexagonal boron nitride,anti-Stokes excitation,nanofiber

Toward the realization of room-temperature single-photon sources, we have been developing hybrid devices that combine hexagonal boron nitride (hBN) defect centers with nanofibers. However, conventional excitation using short-wavelength light induces background light, which degrades the single-photon purity. To address this issue, we focused on anti-Stokes excitation, which enables electronic transitions using long-wavelength light via phonon absorption, and successfully demonstrated a significant reduction in background noise for hBN defect centers positioned on a nanofiber.