High-numerical-aperture microlensed tip on an air-clad optical fiber

Shinya Kato, Sho Chonan, Takao Aoki*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


We show that a hemispherically shaped tip on an air-clad optical fiber simultaneously works as a high-numericalaperture lens and efficiently collects photons from an emitter placed near the beam waist into the fundamental guided mode. Numerical simulations show that the coupling efficiency reaches about 25%. We have constructed a confocal microscope with such a lensed fiber. The measurements are in good agreement with the numerical simulation. The monolithic structure with a high-photon-collection efficiency will provide a flexible substitute for a conventional lens system in various experiments such as single-atom trapping with a tightly focused optical trap.

Original languageEnglish
Pages (from-to)773-776
Number of pages4
JournalOptics Letters
Issue number4
Publication statusPublished - 2014 Feb 15

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'High-numerical-aperture microlensed tip on an air-clad optical fiber'. Together they form a unique fingerprint.

Cite this