Abstract

We demonstrate a method for making precise measurements of the diameter of a tapered optical fiber with a sub-wavelength diameter waist (an optical nanofiber). The essence of the method is to create a composite photonic crystal cavity by mounting a defect-mode grating on an optical nanofiber. The resultant cavity has a resonance wavelength that is sensitive to the nanofiber’s diameter, allowing the diameter to be inferred from optical measurements. This method offers a precise, nondestructive, and in situ way to characterize the nanofiber diameter.

© 2015 Optical Society of America

Diameter measurement of optical nanofiber based on high-order Bragg reflections using a ruled grating

Ming Zhu, Yao-Ting Wang, Yi-Zhi Sun, Lijian Zhang, and Wei Ding
Opt. Lett. 43(3) 559-562 (2018)

Photonic crystal nanofiber using an external grating

Mark Sadgrove, Ramachandrarao Yalla, Kali P. Nayak, and Kohzo Hakuta
Opt. Lett. 38(14) 2542-2545 (2013)

Nondestructive measurement of nanofiber diameters using microfiber tip

Pengfei Zhang, Fan Cheng, Xin Wang, Lijun Song, Chang-Ling Zou, Gang Li, and Tiancai Zhang
Opt. Express 26(24) 31500-31509 (2018)

Optical nanofiber-based photonic crystal cavity

K. P. Nayak, Pengfei Zhang, and K. Hakuta
Opt. Lett. 39(2) 232-235 (2014)

Photothermal tuning and stabilization of a photonic crystal nanofiber cavity

Jie Wang, Kali P. Nayak, and Jameesh Keloth
Opt. Lett. 44(16) 3996-3999 (2019)